Fix nullability warnings

Gui enhancements - Run selected on enter or double click

.gitignore

@@ -214,3 +214,4 @@ FakesAssemblies/
 **/*.Server/GeneratedArtifacts
 **/*.Server/ModelManifest.xml
 _Pvt_Extensions
+/Settings.XamlStyle

README.md

@@ -3,4 +3,8 @@ XUnit Gui written in WPF
 
 A simple replacement for the old winforms xunit.gui with support for xunit 2.0.
 
+Find it on NuGet at [xunit.runner.wpf](https://www.nuget.org/packages/xunit.runner.wpf).
+
+![Screenshot](docs/screenshot.png)
+
 [![Build status](https://ci.appveyor.com/api/projects/status/13dshnyj592mwe9e/branch/master?svg=true)](https://ci.appveyor.com/project/Pilchie/xunit-runner-wpf/branch/master)

SampleTestAssembly/SampleTestAssembly.csproj

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props" Condition="Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -66,12 +65,6 @@
     <None Include="packages.config" />
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props'))" />
-  </Target>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

SampleTestAssembly/packages.config

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Net.Compilers" version="2.2.0" targetFramework="net452" developmentDependency="true" />
   <package id="xunit" version="2.1.0" targetFramework="net452" />
   <package id="xunit.abstractions" version="2.0.0" targetFramework="net452" />
   <package id="xunit.assert" version="2.1.0" targetFramework="net452" />

xunit.runner.data/ClientReader.cs

@@ -7,7 +7,7 @@ namespace Xunit.Runner.Data
     {
         private readonly BinaryReader _reader;
         private bool _closed;
-        private Exception _exception;
+        private Exception? _exception;
 
         public bool IsConnected => !_closed;
 

xunit.runner.data/TestResultData.cs

@@ -10,6 +10,7 @@ namespace Xunit.Runner.Data
     {
         All = 0,
         NotRun,
+        Running,
         Passed,
         Skipped,
         Failed,

xunit.runner.data/xunit.runner.data.csproj

@@ -48,11 +48,6 @@
     <Compile Include="TestDataKind.cs" />
     <Compile Include="TestResultData.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Net.Compilers">
-      <Version>2.2.0</Version>
-    </PackageReference>
-  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.

xunit.runner.worker/DiscoverUtil.cs

@@ -35,7 +35,7 @@ namespace Xunit.Runner.Worker
 
         internal static void Go(string assemblyFileName, Stream stream)
         {
-            Go(assemblyFileName, stream, AppDomainSupport.Denied,
+            Go(assemblyFileName, stream, AppDomainSupport.IfAvailable,
                 (xunit, configuration, writer) =>
                 {
                     using (var sink = new TestDiscoverySink(writer))

xunit.runner.worker/MessageSinks/BaseTestRunSink.cs

@@ -19,6 +19,12 @@ namespace Xunit.Runner.Worker.MessageSinks
 
         protected override bool OnMessage(IMessageSinkMessage message)
         {
+            var testStarted = message as ITestStarting;
+            if (testStarted != null)
+            {
+                OnTestStarted(testStarted);
+            }
+
             var testFailed = message as ITestFailed;
             if (testFailed != null)
             {
@@ -47,6 +53,7 @@ namespace Xunit.Runner.Worker.MessageSinks
 
         protected virtual bool ShouldContinue => true;
 
+        protected abstract void OnTestStarted(ITestStarting testStarted);
         protected abstract void OnTestFailed(ITestFailed testFailed);
         protected abstract void OnTestPassed(ITestPassed testPassed);
         protected abstract void OnTestSkipped(ITestSkipped testSkipped);

xunit.runner.worker/RunUtil.cs

@@ -23,13 +23,18 @@ namespace Xunit.Runner.Worker
 
             private void Process(string displayName, string uniqueID, TestState state, string output = "")
             {
-                Console.WriteLine($"{state} - {displayName}");
+                System.Diagnostics.Trace.WriteLine($"{state} - {displayName}");
                 var result = new TestResultData(displayName, uniqueID, state, output);
 
                 _writer.Write(TestDataKind.Value);
                 _writer.Write(result);
             }
 
+            protected override void OnTestStarted(ITestStarting testStarted)
+            {
+                Process(testStarted.TestCase.DisplayName, testStarted.TestCase.UniqueID, TestState.Running);
+            }
+
             protected override void OnTestFailed(ITestFailed testFailed)
             {
                 var displayName = testFailed.TestCase.DisplayName;

xunit.runner.worker/packages.config

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="Microsoft.Net.Compilers" version="2.2.0" targetFramework="net46" developmentDependency="true" />
   <package id="xunit.abstractions" version="2.0.0" targetFramework="net452" />
   <package id="xunit.runner.utility" version="2.1.0" targetFramework="net46" />
 </packages>

xunit.runner.worker/xunit.runner.worker.csproj

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props" Condition="Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
     <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
@@ -77,12 +76,6 @@
     </ProjectReference>
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
-    <PropertyGroup>
-      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
-    </PropertyGroup>
-    <Error Condition="!Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props'))" />
-  </Target>
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
        Other similar extension points exist, see Microsoft.Common.targets.
   <Target Name="BeforeBuild">

xunit.runner.wpf.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 14
-VisualStudioVersion = 14.0.23107.0
+# Visual Studio 15
+VisualStudioVersion = 15.0.26430.4
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "xunit.runner.wpf", "xunit.runner.wpf\xunit.runner.wpf.csproj", "{34FB519C-FB49-4B31-ACA2-7F7879311BCF}"
 EndProject

xunit.runner.wpf/CommandBindings.cs

@@ -16,16 +16,14 @@ namespace Xunit.Runner.Wpf
             }
         }
 
-        public static CommandBindingCollection GetRegistration(UIElement element)
+        public static CommandBindingCollection? GetRegistration(UIElement element)
             => (element != null ? (CommandBindingCollection)element.GetValue(Registration) : null);
 
         private static void OnRegistrationChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
         {
-            UIElement element = sender as UIElement;
-            if (element != null)
+            if (sender is UIElement element)
             {
-                CommandBindingCollection bindings = e.NewValue as CommandBindingCollection;
-                if (bindings != null)
+                if (e.NewValue is CommandBindingCollection bindings)
                 {
                     element.CommandBindings.AddRange(bindings);
                 }

xunit.runner.wpf/Converters/TestStateConverter.cs

@@ -9,6 +9,7 @@ namespace Xunit.Runner.Wpf.Converters
 {
     public class TestStateConverter : IValueConverter
     {
+        private static ImageSource runningSource;
         private static ImageSource failedSource;
         private static ImageSource passedSource;
         private static ImageSource skippedSource;
@@ -17,6 +18,7 @@ namespace Xunit.Runner.Wpf.Converters
 
         static TestStateConverter()
         {
+            runningSource = LoadResourceImage("Running_small.png");
             failedSource = LoadResourceImage("Failed_small.png");
             passedSource = LoadResourceImage("Passed_small.png");
             skippedSource = LoadResourceImage("Skipped_small.png");
@@ -31,13 +33,15 @@ namespace Xunit.Runner.Wpf.Converters
             return image;
         }
 
-        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        public object? Convert(object value, Type targetType, object parameter, CultureInfo culture)
         {
             var state = (TestState)value;
             if (targetType == typeof(Brush))
             {
                 switch (state)
                 {
+                    case TestState.Running:
+                        return Brushes.Blue;
                     case TestState.Failed:
                         return Brushes.Red;
                     case TestState.Passed:
@@ -52,6 +56,8 @@ namespace Xunit.Runner.Wpf.Converters
             {
                 switch (state)
                 {
+                    case TestState.Running:
+                        return runningSource;
                     case TestState.Failed:
                         return failedSource;
                     case TestState.Passed:

xunit.runner.wpf/FilteredCollectionView.cs

@@ -283,7 +283,13 @@ namespace Xunit.Runner.Wpf
 
         object IList.this[int index]
         {
-            get { return this[index]; }
+            get
+            {
+                // Can't figure out how to not get a warning here.
+#pragma warning disable CS8603
+                return this[index];
+#pragma warning restore
+            }
             set { throw new NotSupportedException(); }
         }
 

xunit.runner.wpf/Impl/RemoteTestUtil.BackgroundRunner.cs

@@ -55,13 +55,13 @@ namespace Xunit.Runner.Wpf.Impl
         /// <typeparam name="T"></typeparam>
         private sealed class BackgroundReader<T> where T : class
         {
-            private readonly ConcurrentQueue<T> _queue;
+            private readonly ConcurrentQueue<T?> _queue;
             private readonly ClientReader _reader;
             private readonly Func<ClientReader, T> _readValue;
 
             internal ClientReader Reader => _reader;
 
-            internal BackgroundReader(ConcurrentQueue<T> queue, ClientReader reader, Func<ClientReader, T> readValue)
+            internal BackgroundReader(ConcurrentQueue<T?> queue, ClientReader reader, Func<ClientReader, T> readValue)
             {
                 _queue = queue;
                 _reader = reader;
@@ -111,7 +111,7 @@ namespace Xunit.Runner.Wpf.Impl
             private const int MaxResultPerTick = 1000;
 
             private readonly Connection _connection;
-            private readonly ConcurrentQueue<T> _queue;
+            private readonly ConcurrentQueue<T?> _queue;
             private readonly DispatcherTimer _timer;
             private readonly Action<List<T>> _callback;
             private readonly int _maxPerTick;
@@ -122,7 +122,7 @@ namespace Xunit.Runner.Wpf.Impl
             internal BackgroundProducer(
                 Connection connection, 
                 Dispatcher dispatcher, 
-                ConcurrentQueue<T> queue,
+                ConcurrentQueue<T?> queue,
                 Action<List<T>> callback,
                 int maxResultPerTick = MaxResultPerTick,
                 TimeSpan? interval = null)
@@ -144,8 +144,7 @@ namespace Xunit.Runner.Wpf.Impl
                 var i = 0;
                 var list = new List<T>();
                 var isDone = false;
-                T value;
-                while (i < _maxPerTick && _queue.TryDequeue(out value))
+                while (i < _maxPerTick && _queue.TryDequeue(out T? value))
                 {
                     if (value == null)
                     {

xunit.runner.wpf/Impl/RemoteTestUtil.Connection.cs

@@ -8,10 +8,10 @@ namespace Xunit.Runner.Wpf.Impl
     {
         private sealed class Connection : IDisposable
         {
-            private NamedPipeClientStream _stream;
+            private NamedPipeClientStream? _stream;
             private ClientReader _reader;
 
-            internal NamedPipeClientStream Stream => _stream;
+            internal NamedPipeClientStream Stream => _stream ?? throw new ObjectDisposedException(nameof(Connection));
 
             internal ClientReader Reader => _reader;
 

xunit.runner.wpf/Impl/RemoteTestUtil.cs

@@ -123,7 +123,7 @@ namespace Xunit.Runner.Wpf.Impl
         private async Task ProcessResultsCore<T>(Connection connection, Func<ClientReader, T> readValue, Action<List<T>> callback, CancellationToken cancellationToken)
             where T : class
         {
-            var queue = new ConcurrentQueue<T>();
+            var queue = new ConcurrentQueue<T?>();
             var backgroundReader = new BackgroundReader<T>(queue, new ClientReader(connection.Stream), readValue);
             var backgroundProducer = new BackgroundProducer<T>(connection, _dispatcher, queue, callback);
 

xunit.runner.wpf/Impl/TestAssemblyWatcher.cs

@@ -14,7 +14,7 @@ namespace Xunit.Runner.Wpf.Impl
         private readonly IDictionary<string, FileSystemWatcher> watchedAssemblies = new Dictionary<string, FileSystemWatcher>();
         private readonly Dispatcher dispatcher;
         private bool isEnabled = false;
-        private ReloadDebouncer debouncer;
+        private ReloadDebouncer? debouncer;
 
         public TestAssemblyWatcher(Dispatcher dispatcher)
         {

xunit.runner.wpf/MainWindow.xaml

@@ -1,24 +1,25 @@
-<Window x:Class="Xunit.Runner.Wpf.MainWindow"
-        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
-        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
-        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
-        xmlns:local="clr-namespace:Xunit.Runner.Wpf"
-        xmlns:converters="clr-namespace:Xunit.Runner.Wpf.Converters"
-        xmlns:vm="clr-namespace:Xunit.Runner.Wpf.ViewModel"
-        xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
-        xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Platform"
-        xmlns:sys="clr-namespace:System;assembly=mscorlib"
-        mc:Ignorable="d"
-        DataContext="{Binding Main, Source={StaticResource Locator}}"
-        Title="xUnit.net Test Runner"
-        Icon="Artwork\Application.ico"
-        ResizeMode="CanResizeWithGrip"
-        Height="600"
-        MinHeight="525"
-        Width="525"
-        MinWidth="425"
-        Name="Main">
+<Window
+    x:Class="Xunit.Runner.Wpf.MainWindow"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:cmd="clr-namespace:GalaSoft.MvvmLight.Command;assembly=GalaSoft.MvvmLight.Platform"
+    xmlns:converters="clr-namespace:Xunit.Runner.Wpf.Converters"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"
+    xmlns:local="clr-namespace:Xunit.Runner.Wpf"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    xmlns:sys="clr-namespace:System;assembly=mscorlib"
+    xmlns:vm="clr-namespace:Xunit.Runner.Wpf.ViewModel"
+    Name="Main"
+    Title="xUnit.net Test Runner"
+    Width="525"
+    Height="600"
+    MinWidth="425"
+    MinHeight="525"
+    DataContext="{Binding Main, Source={StaticResource Locator}}"
+    Icon="Artwork\Application.ico"
+    ResizeMode="CanResizeWithGrip"
+    mc:Ignorable="d">
 
     <i:Interaction.Triggers>
         <i:EventTrigger EventName="Loaded">
@@ -43,12 +44,10 @@
 
         <Menu Grid.Row="0">
             <MenuItem Header="_File">
-                <MenuItem Header="E_xit"
-                          Command="{Binding ExitCommand}" />
+                <MenuItem Command="{Binding ExitCommand}" Header="E_xit" />
             </MenuItem>
             <MenuItem Header="_Assembly">
-                <MenuItem Header="_Open"
-                          Command="ApplicationCommands.Open" />
+                <MenuItem Command="ApplicationCommands.Open" Header="_Open" />
                 <MenuItem Header="R_ecent" ItemsSource="{Binding RecentAssemblies}">
                     <MenuItem.ItemContainerStyle>
                         <Style TargetType="MenuItem">
@@ -59,10 +58,14 @@
                     </MenuItem.ItemContainerStyle>
                 </MenuItem>
                 <Separator />
-                <MenuItem Header="_Unload" Command="{Binding AssemblyRemoveAllCommand}"/>
-                <MenuItem Header="_Reload" Command="{Binding AssemblyReloadAllCommand}" />
+                <MenuItem Command="{Binding AssemblyRemoveAllCommand}" Header="_Unload" />
+                <MenuItem Command="{Binding AssemblyReloadAllCommand}" Header="_Reload" />
                 <Separator />
-                <MenuItem Header="_Auto Reload Test Assemblies" IsCheckable="True" IsChecked="{Binding AutoReloadAssemblies}" Command="{Binding AutoReloadAssembliesCommand}" />
+                <MenuItem
+                    Command="{Binding AutoReloadAssembliesCommand}"
+                    Header="_Auto Reload Test Assemblies"
+                    IsCheckable="True"
+                    IsChecked="{Binding AutoReloadAssemblies}" />
             </MenuItem>
             <MenuItem Header="_Project">
                 <MenuItem Header="_Open" />
@@ -86,10 +89,11 @@
                 <RowDefinition Height="auto" />
             </Grid.RowDefinitions>
 
-            <GroupBox Header="Refinements"
-                      Margin="3"
-                      Grid.Column="0"
-                      Grid.Row="0">
+            <GroupBox
+                Grid.Row="0"
+                Grid.Column="0"
+                Margin="3"
+                Header="Refinements">
                 <Grid>
                     <Grid.RowDefinitions>
                         <RowDefinition Height="auto" />
@@ -100,25 +104,24 @@
                         <RowDefinition Height="*" />
                     </Grid.RowDefinitions>
 
-                    <Label Content="Search:"
-                           Grid.Row="0" />
-                    <TextBox Grid.Row="1"
-                             Text="{Binding FilterString, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
+                    <Label Grid.Row="0" Content="Search:" />
+                    <TextBox Grid.Row="1" Text="{Binding FilterString, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" />
 
-                    <Label Content="Assemblies:"
-                           Grid.Row="2" />
-                    <ListBox Height="175"
-                             ItemsSource="{Binding Assemblies}"
-                             SelectionMode="Extended"
-                             Grid.Row="3">
+                    <Label Grid.Row="2" Content="Assemblies:" />
+                    <ListBox
+                        Grid.Row="3"
+                        Height="175"
+                        ItemsSource="{Binding Assemblies}"
+                        SelectionMode="Extended">
                         <ListBox.ItemTemplate>
                             <DataTemplate DataType="vm:TestAssemblyViewModel">
                                 <StackPanel Orientation="Horizontal">
                                     <TextBlock Text="{Binding DisplayName}" />
 
-                                    <TextBlock Text=" Discovering tests..."
-                                               FontStyle="Italic"
-                                               Foreground="Gray">
+                                    <TextBlock
+                                        FontStyle="Italic"
+                                        Foreground="Gray"
+                                        Text=" Discovering tests...">
 
                                         <TextBlock.Style>
                                             <Style TargetType="TextBlock">
@@ -138,41 +141,36 @@
 
                         <ListBox.ItemContainerStyle>
                             <Style TargetType="{x:Type ListBoxItem}">
-                                <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}"/>
+                                <Setter Property="IsSelected" Value="{Binding Mode=TwoWay, Path=IsSelected}" />
                             </Style>
                         </ListBox.ItemContainerStyle>
 
                         <ListBox.ContextMenu>
                             <ContextMenu>
-                                <MenuItem Header="Reload" Command="{Binding AssemblyReloadCommand}" />
-                                <MenuItem Header="Reload All" Command="{Binding AssemblyReloadAllCommand}" />
+                                <MenuItem Command="{Binding AssemblyReloadCommand}" Header="Reload" />
+                                <MenuItem Command="{Binding AssemblyReloadAllCommand}" Header="Reload All" />
                                 <Separator />
-                                <MenuItem Header="Remove" Command="{Binding AssemblyRemoveCommand}" />
-                                <MenuItem Header="Remove All" Command="{Binding AssemblyRemoveAllCommand}" />
+                                <MenuItem Command="{Binding AssemblyRemoveCommand}" Header="Remove" />
+                                <MenuItem Command="{Binding AssemblyRemoveAllCommand}" Header="Remove All" />
                             </ContextMenu>
                         </ListBox.ContextMenu>
                     </ListBox>
 
-                    <Label Content="Traits:"
-                           Grid.Row="4" />
+                    <Label Grid.Row="4" Content="Traits:" />
 
-                    <TreeView Grid.Row="5"
-                              ItemsSource="{Binding Traits}">
+                    <TreeView Grid.Row="5" ItemsSource="{Binding Traits}">
 
                         <TreeView.Resources>
-                            <HierarchicalDataTemplate DataType="{x:Type vm:TraitViewModel}"
-                                                      ItemsSource="{Binding Children}">
+                            <HierarchicalDataTemplate DataType="{x:Type vm:TraitViewModel}" ItemsSource="{Binding Children}">
 
-                                <CheckBox IsChecked="{Binding IsChecked}" Content="{Binding Text}" >
+                                <CheckBox Content="{Binding Text}" IsChecked="{Binding IsChecked}">
                                     <i:Interaction.Triggers>
                                         <i:EventTrigger EventName="Checked">
-                                            <cmd:EventToCommand Command="{Binding DataContext.TraitCheckedChangedCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                                                CommandParameter="{Binding}" />
+                                            <cmd:EventToCommand Command="{Binding DataContext.TraitCheckedChangedCommand, RelativeSource={RelativeSource AncestorType=Window}}" CommandParameter="{Binding}" />
                                         </i:EventTrigger>
 
                                         <i:EventTrigger EventName="Unchecked">
-                                            <cmd:EventToCommand Command="{Binding DataContext.TraitCheckedChangedCommand, RelativeSource={RelativeSource AncestorType=Window}}"
-                                                                CommandParameter="{Binding}" />
+                                            <cmd:EventToCommand Command="{Binding DataContext.TraitCheckedChangedCommand, RelativeSource={RelativeSource AncestorType=Window}}" CommandParameter="{Binding}" />
                                         </i:EventTrigger>
                                     </i:Interaction.Triggers>
                                 </CheckBox>
@@ -188,7 +186,7 @@
 
                         <TreeView.ContextMenu>
                             <ContextMenu>
-                                <MenuItem Header="Clear" Command="{Binding TraitsClearCommand}" />
+                                <MenuItem Command="{Binding TraitsClearCommand}" Header="Clear" />
                             </ContextMenu>
                         </TreeView.ContextMenu>
 
@@ -196,36 +194,40 @@
                 </Grid>
             </GroupBox>
 
-            <Grid Grid.Column="0"
-                  Grid.Row="1">
+            <Grid Grid.Row="1" Grid.Column="0">
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="*" />
-                    <ColumnDefinition Width="*"/>
+                    <ColumnDefinition Width="*" />
                     <ColumnDefinition Width="*" />
                 </Grid.ColumnDefinitions>
 
-                <Button Content="_Run All"
-                        Command="{Binding RunAllCommand}"
-                        Grid.Column="0" Margin="10,0,0,0"/>
-                <Button Content="Run _Selected"
-                        Command="{Binding RunSelectedCommand}"
-                        Grid.Column="1"/>
-                <Button Content="_Cancel"
-                        Command="{Binding CancelCommand}"
-                        Grid.Column="2" Margin="0,0,10,0" />
+                <Button
+                    Grid.Column="0"
+                    Margin="10,0,0,0"
+                    Command="{Binding RunAllCommand}"
+                    Content="_Run All" />
+                <Button
+                    Grid.Column="1"
+                    Command="{Binding RunSelectedCommand}"
+                    Content="Run _Selected" />
+                <Button
+                    Grid.Column="2"
+                    Margin="0,0,10,0"
+                    Command="{Binding CancelCommand}"
+                    Content="_Cancel" />
             </Grid>
 
-            <Grid Grid.Column="1"
-                  Grid.Row="0">
+            <Grid Grid.Row="0" Grid.Column="1">
                 <Grid.RowDefinitions>
                     <RowDefinition Height="*" MinHeight="200px" />
                     <RowDefinition Height="auto" />
-                    <RowDefinition Height="*"  MinHeight="200px"/>
+                    <RowDefinition Height="*" MinHeight="200px" />
                 </Grid.RowDefinitions>
 
-                <GroupBox Header="{Binding TestCasesCaption}"
-                          Margin="3"
-                          Grid.Row="0">
+                <GroupBox
+                    Grid.Row="0"
+                    Margin="3"
+                    Header="{Binding TestCasesCaption}">
                     <Grid>
                         <Grid.RowDefinitions>
                             <RowDefinition Height="auto" />
@@ -233,56 +235,82 @@
                         </Grid.RowDefinitions>
 
                         <StackPanel Orientation="Horizontal">
-                            <ToggleButton IsChecked="{Binding FilterPassedTests}"
-                                          BorderThickness="0"
-                                          Background="Transparent"
-                                          Margin="0,4,2,4"
-                                          Grid.Column="0"
-                                          Command="{Binding TestFilterChanged}">
+                            <ToggleButton
+                                Grid.Column="0"
+                                Margin="0,4,2,4"
+                                Background="Transparent"
+                                BorderThickness="0"
+                                Command="{Binding TestFilterChanged}"
+                                IsChecked="{Binding FilterPassedTests}">
                                 <StackPanel Orientation="Horizontal">
                                     <Image Source="Artwork\Passed_large.png" />
-                                    <TextBlock Margin="4,0"
-                                               FontSize="16"
-                                               Text="{Binding TestsPassed, StringFormat={}{0:#\,0}}"
-                                               VerticalAlignment="Center" />
+                                    <TextBlock
+                                        Margin="4,0"
+                                        VerticalAlignment="Center"
+                                        FontSize="16"
+                                        Text="{Binding TestsPassed, StringFormat={}{0:#\,0}}" />
                                 </StackPanel>
                             </ToggleButton>
 
-                            <ToggleButton IsChecked="{Binding FilterFailedTests}"
-                                          BorderThickness="0"
-                                          Background="Transparent"
-                                          Margin="2,4"
-                                          Grid.Column="1"
-                                          Command="{Binding TestFilterChanged}">
+                            <ToggleButton
+                                Grid.Column="1"
+                                Margin="2,4"
+                                Background="Transparent"
+                                BorderThickness="0"
+                                Command="{Binding TestFilterChanged}"
+                                IsChecked="{Binding FilterFailedTests}">
                                 <StackPanel Orientation="Horizontal">
                                     <Image Source="Artwork\Failed_large.png" />
-                                    <TextBlock Margin="4,0"
-                                               FontSize="16"
-                                               Text="{Binding TestsFailed, StringFormat={}{0:#\,0}}"
-                                               VerticalAlignment="Center" />
+                                    <TextBlock
+                                        Margin="4,0"
+                                        VerticalAlignment="Center"
+                                        FontSize="16"
+                                        Text="{Binding TestsFailed, StringFormat={}{0:#\,0}}" />
                                 </StackPanel>
                             </ToggleButton>
 
-                            <ToggleButton IsChecked="{Binding FilterSkippedTests}"
-                                          BorderThickness="0"
-                                          Background="Transparent"
-                                          Margin="2,4,0,4"
-                                          Grid.Column="2"
-                                          Command="{Binding TestFilterChanged}">
+                            <ToggleButton
+                                Grid.Column="2"
+                                Margin="2,4,0,4"
+                                Background="Transparent"
+                                BorderThickness="0"
+                                Command="{Binding TestFilterChanged}"
+                                IsChecked="{Binding FilterSkippedTests}">
                                 <StackPanel Orientation="Horizontal">
                                     <Image Source="Artwork\Skipped_large.png" />
-                                    <TextBlock Margin="4,0"
-                                               FontSize="16"
-                                               Text="{Binding TestsSkipped, StringFormat={}{0:#\,0}}"
-                                               VerticalAlignment="Center" />
+                                    <TextBlock
+                                        Margin="4,0"
+                                        VerticalAlignment="Center"
+                                        FontSize="16"
+                                        Text="{Binding TestsSkipped, StringFormat={}{0:#\,0}}" />
+                                </StackPanel>
+                            </ToggleButton>
+
+                            <ToggleButton
+                                Grid.Column="2"
+                                Margin="2,4,0,4"
+                                Background="Transparent"
+                                BorderThickness="0"
+                                Command="{Binding TestFilterChanged}"
+                                IsChecked="{Binding FilterRunningTests}">
+                                <StackPanel Orientation="Horizontal">
+                                    <Image Source="Artwork\Running_large.png" />
+                                    <TextBlock
+                                        Margin="4,0"
+                                        VerticalAlignment="Center"
+                                        FontSize="16"
+                                        Text="{Binding TestsRunning, StringFormat={}{0:#\,0}}" />
                                 </StackPanel>
                             </ToggleButton>
                         </StackPanel>
 
-                        <ListBox x:Name="TestCases" ItemsSource="{Binding FilteredTestCases}"
-                                 SelectionMode="Extended"
-                                 SelectedItem="{Binding SelectedTestCase, Mode=TwoWay}"
-                                 Grid.Row="1" SelectionChanged="TestCases_SelectionChanged">
+                        <ListBox
+                            x:Name="TestCases"
+                            Grid.Row="1"
+                            ItemsSource="{Binding FilteredTestCases}"
+                            SelectedItem="{Binding SelectedTestCase, Mode=TwoWay}"
+                            SelectionChanged="TestCases_SelectionChanged"
+                            SelectionMode="Extended">
                             <ListBox.ItemTemplate>
                                 <DataTemplate DataType="vm:TestCaseViewModel">
                                     <Grid>
@@ -291,49 +319,71 @@
                                             <ColumnDefinition Width="*" />
                                         </Grid.ColumnDefinitions>
 
-                                        <Image Width="16"
-                                               Margin="0,0,2,0"
-                                               Source="{Binding Path=State, Mode=OneWay, Converter={StaticResource TestStateConverter}}"
-                                               Grid.Column="0" />
+                                        <Image
+                                            Grid.Column="0"
+                                            Width="16"
+                                            Margin="0,0,2,0"
+                                            Source="{Binding Path=State, Mode=OneWay, Converter={StaticResource TestStateConverter}}" />
 
-                                        <TextBlock Text="{Binding DisplayName}"
-                                                   VerticalAlignment="Center"
-                                                   Grid.Column="1" />
+                                        <TextBlock
+                                            Grid.Column="1"
+                                            VerticalAlignment="Center"
+                                            Text="{Binding DisplayName}" />
                                     </Grid>
                                 </DataTemplate>
                             </ListBox.ItemTemplate>
+                            <ListBox.InputBindings>
+                                <KeyBinding Key="Enter" Command="{Binding RunSelectedCommand}" />
+                            </ListBox.InputBindings>
+                            <i:Interaction.Triggers>
+                                <i:EventTrigger EventName="MouseDoubleClick">
+                                    <cmd:EventToCommand Command="{Binding Path=RunSelectedCommand}" PassEventArgsToCommand="False" />
+                                </i:EventTrigger>
+                            </i:Interaction.Triggers>
                         </ListBox>
                     </Grid>
                 </GroupBox>
 
-                <GridSplitter Grid.Row="1" HorizontalAlignment="Stretch" Height="3" Background="White"/>
+                <GridSplitter
+                    Grid.Row="1"
+                    Height="3"
+                    HorizontalAlignment="Stretch"
+                    Background="White" />
 
-                <GroupBox Header="Output"
-                          Margin="3"
-                          Grid.Row="2">
-                    <TextBox IsReadOnly="True"
-                             HorizontalScrollBarVisibility="Auto"
-                             VerticalScrollBarVisibility="Visible"
-                             FontFamily="Consolas"
-                             Text="{Binding Output}"/>
+                <GroupBox
+                    Grid.Row="2"
+                    Margin="3"
+                    Header="Output">
+                    <TextBox
+                        FontFamily="Consolas"
+                        HorizontalScrollBarVisibility="Auto"
+                        IsReadOnly="True"
+                        Text="{Binding Output}"
+                        VerticalScrollBarVisibility="Visible" />
                 </GroupBox>
             </Grid>
 
-            <GridSplitter Grid.Column="0" VerticalAlignment="Stretch" Width="3" Background="White"/>
+            <GridSplitter
+                Grid.Column="0"
+                Width="3"
+                VerticalAlignment="Stretch"
+                Background="White" />
 
-            <ProgressBar Foreground="{Binding Path=CurrentRunState, Converter={StaticResource TestStateConverter}, Mode=OneWay}"
-                         Minimum="0"
-                         Maximum="{Binding MaximumProgress}"
-                         Value="{Binding Path=TestsCompleted}"
-                         Grid.Column="1"
-                         Grid.Row="1"
-                         Margin="3" />
+            <ProgressBar
+                Grid.Row="1"
+                Grid.Column="1"
+                Margin="3"
+                Foreground="{Binding Path=CurrentRunState, Converter={StaticResource TestStateConverter}, Mode=OneWay}"
+                Maximum="{Binding MaximumProgress}"
+                Minimum="0"
+                Value="{Binding Path=TestsCompleted}" />
         </Grid>
 
         <StackPanel Grid.Row="2">
-            <Border BorderBrush="LightGray"
-                    BorderThickness="1"
-                    Margin="3" />
+            <Border
+                Margin="3"
+                BorderBrush="LightGray"
+                BorderThickness="1" />
             <StatusBar>
                 <StatusBar.ItemsPanel>
                     <ItemsPanelTemplate>
@@ -343,7 +393,7 @@
                                 <ColumnDefinition Width="auto" />
                                 <ColumnDefinition Width="auto" />
                                 <ColumnDefinition Width="auto" />
-                                <ColumnDefinition Width="16"/>
+                                <ColumnDefinition Width="16" />
                             </Grid.ColumnDefinitions>
                         </Grid>
                     </ItemsPanelTemplate>
@@ -351,28 +401,25 @@
 
                 <StatusBarItem Grid.Column="1">
                     <StackPanel Orientation="Horizontal">
-                        <TextBlock Text="Tests passed: "
-                                   Foreground="DarkGreen"/>
+                        <TextBlock Foreground="DarkGreen" Text="Tests passed: " />
 
-                        <TextBlock Text="{Binding TestsPassed, StringFormat={}{0:#\,0}}"/>
+                        <TextBlock Text="{Binding TestsPassed, StringFormat={}{0:#\,0}}" />
                     </StackPanel>
                 </StatusBarItem>
 
                 <StatusBarItem Grid.Column="2">
                     <StackPanel Orientation="Horizontal">
-                        <TextBlock Text="Tests failed: "
-                                   Foreground="DarkRed"/>
+                        <TextBlock Foreground="DarkRed" Text="Tests failed: " />
 
-                        <TextBlock Text="{Binding TestsFailed, StringFormat={}{0:#\,0}}"/>
+                        <TextBlock Text="{Binding TestsFailed, StringFormat={}{0:#\,0}}" />
                     </StackPanel>
                 </StatusBarItem>
 
                 <StatusBarItem Grid.Column="3">
                     <StackPanel Orientation="Horizontal">
-                        <TextBlock Text="Tests skipped: "
-                                   Foreground="DarkGoldenrod"/>
+                        <TextBlock Foreground="DarkGoldenrod" Text="Tests skipped: " />
 
-                        <TextBlock Text="{Binding TestsSkipped, StringFormat={}{0:#\,0}}"/>
+                        <TextBlock Text="{Binding TestsSkipped, StringFormat={}{0:#\,0}}" />
                     </StackPanel>
                 </StatusBarItem>
             </StatusBar>

xunit.runner.wpf/MainWindow.xaml.cs

@@ -11,12 +11,15 @@ namespace Xunit.Runner.Wpf
     {
         public static Window Instance { get; private set; }
 
+        // WPF generates fields that are marked as non-nullable, but not definitely initialized.
+#pragma warning disable CS8618
         public MainWindow()
         {
             Instance = this;
 
             InitializeComponent();
         }
+#pragma warning restore
 
         protected override void OnSourceInitialized(EventArgs e)
         {

xunit.runner.wpf/Persistence/Settings.cs

@@ -125,6 +125,10 @@ namespace Xunit.Runner.Wpf.Persistence
 
                     settings.autoReloadAssemblies = autoReloadAssemblies;
                 }
+                else
+                {
+                    settings.autoReloadAssemblies = true;
+                }
 
                 return settings;
             }

xunit.runner.wpf/Persistence/Storage.cs

@@ -16,7 +16,7 @@ namespace Xunit.Runner.Wpf.Persistence
 
         private static IsolatedStorageFile GetStorageFile() => IsolatedStorageFile.GetUserStoreForDomain();
 
-        public static XmlTextReader OpenXmlFile(string fileName)
+        public static XmlTextReader? OpenXmlFile(string fileName)
         {
             var storage = GetStorageFile();
             if (!storage.FileExists(fileName))

xunit.runner.wpf/ViewModel/AssemblyAndConfigFile.cs

@@ -5,9 +5,9 @@ namespace Xunit.Runner.Wpf.ViewModel
     public class AssemblyAndConfigFile
     {
         public string AssemblyFileName { get; }
-        public string ConfigFileName { get; }
+        public string? ConfigFileName { get; }
 
-        public AssemblyAndConfigFile(string assemblyFileName, string configFileName)
+        public AssemblyAndConfigFile(string assemblyFileName, string? configFileName)
         {
             this.AssemblyFileName = Path.GetFullPath(assemblyFileName);
             if (configFileName != null)

xunit.runner.wpf/ViewModel/MainViewModel.cs

@@ -29,9 +29,11 @@ namespace Xunit.Runner.Wpf.ViewModel
         private readonly HashSet<string> allTestCaseUniqueIDs = new HashSet<string>();
         private readonly ObservableCollection<TestCaseViewModel> allTestCases = new ObservableCollection<TestCaseViewModel>();
         private readonly TraitCollectionView traitCollectionView = new TraitCollectionView();
+        private readonly HashSet<string> runningTestSet = new HashSet<string>();
+
         private CancellationTokenSource filterCancellationTokenSource = new CancellationTokenSource();
 
-        private CancellationTokenSource cancellationTokenSource;
+        private CancellationTokenSource? cancellationTokenSource;
         private bool isBusy;
         private SearchQuery searchQuery = new SearchQuery();
         private bool autoReloadAssemblies;
@@ -52,7 +54,7 @@ namespace Xunit.Runner.Wpf.ViewModel
 
         public ObservableCollection<RecentAssemblyViewModel> RecentAssemblies { get; } = new ObservableCollection<RecentAssemblyViewModel>();
 
-        private ImmutableList<TestCaseViewModel> runningTests;
+        private ImmutableList<TestCaseViewModel>? testsToRun;
 
         public ICommand ExitCommand { get; }
         public ICommand WindowLoadedCommand { get; }
@@ -61,7 +63,6 @@ namespace Xunit.Runner.Wpf.ViewModel
         public RelayCommand RunSelectedCommand { get; }
         public RelayCommand CancelCommand { get; }
         public ICommand TraitCheckedChangedCommand { get; }
-        public ICommand TraitSelectionChangedCommand { get; }
         public ICommand TraitsClearCommand { get; }
         public ICommand AssemblyReloadCommand { get; }
         public ICommand AssemblyReloadAllCommand { get; }
@@ -107,6 +108,7 @@ namespace Xunit.Runner.Wpf.ViewModel
 
             RebuildRecentAssembliesMenu();
             AutoReloadAssemblies = this.settings.GetAutoReloadAssemblies();
+            UpdateAutoReloadStatus();
         }
 
         private void RebuildRecentAssembliesMenu()
@@ -152,10 +154,13 @@ namespace Xunit.Runner.Wpf.ViewModel
                 }
             }
 
-            var noFilter = !(searchQuery.FilterFailedTests | searchQuery.FilterPassedTests | searchQuery.FilterSkippedTests);
+            var noFilter = !(searchQuery.FilterRunningTests | searchQuery.FilterFailedTests | searchQuery.FilterPassedTests | searchQuery.FilterSkippedTests);
 
             switch (testCase.State)
             {
+                case TestState.Running:
+                    return noFilter || searchQuery.FilterRunningTests;
+
                 case TestState.Passed:
                     return noFilter || searchQuery.FilterPassedTests;
 
@@ -209,8 +214,8 @@ namespace Xunit.Runner.Wpf.ViewModel
             get { return Assemblies.Where(x => x.IsSelected).ToList(); }
         }
 
-        private string testCasesCaption;
-        public string TestCasesCaption
+        private string? testCasesCaption;
+        public string? TestCasesCaption
         {
             get { return testCasesCaption; }
             private set { Set(ref testCasesCaption, value); }
@@ -228,8 +233,8 @@ namespace Xunit.Runner.Wpf.ViewModel
             }
         }
 
-        private TestCaseViewModel selectedTest;
-        public TestCaseViewModel SelectedTestCase
+        private TestCaseViewModel? selectedTest;
+        public TestCaseViewModel? SelectedTestCase
         {
             get { return selectedTest; }
 
@@ -262,6 +267,13 @@ namespace Xunit.Runner.Wpf.ViewModel
             }
         }
 
+        private int testsRunning = 0;
+        public int TestsRunning
+        {
+            get { return testsRunning; }
+            set { Set(ref testsRunning, value); }
+        }
+
         private int testsPassed = 0;
         public int TestsPassed
         {
@@ -388,7 +400,7 @@ namespace Xunit.Runner.Wpf.ViewModel
                     var taskList = new List<Task>();
                     foreach (var assembly in assemblies)
                     {
-                        taskList.Add(this.testUtil.Discover(assembly.AssemblyFileName, this.OnTestsDiscovered, this.cancellationTokenSource.Token));
+                        taskList.Add(this.testUtil.Discover(assembly.AssemblyFileName, this.OnTestsDiscovered, CancellationToken));
 
                         var assemblyViewModel = new TestAssemblyViewModel(assembly);
 
@@ -414,6 +426,11 @@ namespace Xunit.Runner.Wpf.ViewModel
             }
         }
 
+        private CancellationToken CancellationToken
+            => cancellationTokenSource == null
+                ? CancellationToken.None
+                : cancellationTokenSource.Token;
+
         public bool ReloadAssemblies(IEnumerable<string> assemblies)
         {
             if (IsBusy)
@@ -441,7 +458,7 @@ namespace Xunit.Runner.Wpf.ViewModel
                         var assemblyFileName = assemblyViewModel.FileName;
                         RemoveAssemblyTestCases(assemblyFileName);
 
-                        taskList.Add(this.testUtil.Discover(assemblyFileName, OnTestsDiscovered, cancellationTokenSource.Token));
+                        taskList.Add(this.testUtil.Discover(assemblyFileName, OnTestsDiscovered, CancellationToken));
                     }
 
                     return taskList;
@@ -536,7 +553,7 @@ namespace Xunit.Runner.Wpf.ViewModel
                 var assemblyFileName = enumerable.First();
                 enumerable = enumerable.Skip(1);
 
-                var configFileName = (string)null;
+                var configFileName = (string?)null;
                 if (IsConfigFile(enumerable.FirstOrDefault()))
                 {
                     configFileName = enumerable.First();
@@ -559,12 +576,12 @@ namespace Xunit.Runner.Wpf.ViewModel
 
         private async void OnExecuteRunAll()
         {
-            Debug.Assert(this.runningTests == null);
+            Debug.Assert(this.testsToRun == null);
             UpdateTestCaseInfo(useSelected: false);
 
             await ExecuteTestSessionOperation(RunFilteredTests);
 
-            this.runningTests = null;
+            this.testsToRun = null;
         }
 
         private List<Task> RunFilteredTests()
@@ -574,13 +591,13 @@ namespace Xunit.Runner.Wpf.ViewModel
 
         private async void OnExecuteRunSelected()
         {
-            Debug.Assert(this.runningTests == null);
+            Debug.Assert(this.testsToRun == null);
             Debug.Assert(this.SelectedTestCase != null);
             UpdateTestCaseInfo(useSelected: true);
 
             await ExecuteTestSessionOperation(RunSelectedTests);
 
-            this.runningTests = null;
+            this.testsToRun = null;
         }
 
         private List<Task> RunSelectedTests()
@@ -592,37 +609,38 @@ namespace Xunit.Runner.Wpf.ViewModel
         {
             Debug.Assert(this.isBusy);
             Debug.Assert(this.cancellationTokenSource != null);
-            Debug.Assert(this.runningTests == null);
+            Debug.Assert(this.testsToRun == null);
 
             TestsCompleted = 0;
+            TestsRunning = 0;
             TestsPassed = 0;
             TestsFailed = 0;
             TestsSkipped = 0;
             CurrentRunState = TestState.NotRun;
             Output = string.Empty;
 
-            this.runningTests = tests;
+            this.testsToRun = tests;
 
-            foreach (var tc in this.runningTests)
+            foreach (var tc in this.testsToRun)
             {
                 tc.State = TestState.NotRun;
             }
 
-            var runAll = this.runningTests.Count == this.allTestCases.Count;
+            var runAll = this.testsToRun.Count == this.allTestCases.Count;
             var testSessionList = new List<Task>();
 
-            foreach (var assemblyFileName in this.runningTests.Select(x => x.AssemblyFileName).Distinct())
+            foreach (var assemblyFileName in this.testsToRun.Select(x => x.AssemblyFileName).Distinct())
             {
                 Task task;
                 if (runAll)
                 {
-                    task = this.testUtil.RunAll(assemblyFileName, OnTestsFinished, this.cancellationTokenSource.Token);
+                    task = this.testUtil.RunAll(assemblyFileName, OnTestStateChange, CancellationToken);
                 }
                 else
                 {
                     var builder = ImmutableArray.CreateBuilder<string>();
 
-                    foreach (var testCase in this.runningTests)
+                    foreach (var testCase in this.testsToRun)
                     {
                         if (testCase.AssemblyFileName == assemblyFileName)
                         {
@@ -630,7 +648,7 @@ namespace Xunit.Runner.Wpf.ViewModel
                         }
                     }
 
-                    task = this.testUtil.RunSpecific(assemblyFileName, builder.ToImmutable(), OnTestsFinished, this.cancellationTokenSource.Token);
+                    task = this.testUtil.RunSpecific(assemblyFileName, builder.ToImmutable(), OnTestStateChange, CancellationToken);
                 }
 
                 testSessionList.Add(task);
@@ -710,28 +728,43 @@ namespace Xunit.Runner.Wpf.ViewModel
             }
         }
 
-        private void OnTestsFinished(IEnumerable<TestResultData> testResultData)
+        private void OnTestStateChange(IEnumerable<TestResultData> testResultData)
         {
-            Debug.Assert(this.runningTests != null);
+            Debug.Assert(this.testsToRun != null);
 
             foreach (var result in testResultData)
             {
-                var testCase = this.runningTests.Single(x => x.UniqueID == result.TestCaseUniqueID);
+                var testCase = this.testsToRun.Single(x => x.UniqueID == result.TestCaseUniqueID);
                 testCase.State = result.TestState;
 
-                TestsCompleted++;
-                switch (result.TestState)
+                if (result.TestState == TestState.Running)
                 {
-                    case TestState.Passed:
-                        TestsPassed++;
-                        break;
-                    case TestState.Failed:
-                        TestsFailed++;
-                        Output = Output + result.Output;
-                        break;
-                    case TestState.Skipped:
-                        TestsSkipped++;
-                        break;
+                    if (runningTestSet.Add(result.TestCaseUniqueID))
+                    {
+                        TestsRunning++;
+                    }
+                }
+                else
+                {
+                    if (runningTestSet.Remove(result.TestCaseUniqueID))
+                    {
+                        TestsRunning--;
+                    }
+
+                    TestsCompleted++;
+                    switch (result.TestState)
+                    {
+                        case TestState.Passed:
+                            TestsPassed++;
+                            break;
+                        case TestState.Failed:
+                            TestsFailed++;
+                            Output = Output + result.Output;
+                            break;
+                        case TestState.Skipped:
+                            TestsSkipped++;
+                            break;
+                    }
                 }
 
                 if (result.TestState > CurrentRunState)
@@ -749,7 +782,7 @@ namespace Xunit.Runner.Wpf.ViewModel
         private void OnExecuteCancel()
         {
             Debug.Assert(CanExecuteCancel());
-            this.cancellationTokenSource.Cancel();
+            cancellationTokenSource?.Cancel();
         }
 
         private void OnExecuteTraitCheckedChanged(TraitViewModel trait)
@@ -819,6 +852,18 @@ namespace Xunit.Runner.Wpf.ViewModel
             }
         }
 
+        public bool FilterRunningTests
+        {
+            get { return searchQuery.FilterRunningTests; }
+            set
+            {
+                if (Set(ref searchQuery.FilterRunningTests, value))
+                {
+                    FilterAfterDelay();
+                }
+            }
+        }
+
         public bool FilterPassedTests
         {
             get { return searchQuery.FilterPassedTests; }

xunit.runner.wpf/ViewModel/SearchQuery.cs

@@ -4,6 +4,7 @@ namespace Xunit.Runner.Wpf.ViewModel
 {
     public class SearchQuery
     {
+        public bool FilterRunningTests = false;
         public bool FilterFailedTests = false;
         public bool FilterPassedTests = false;
         public bool FilterSkippedTests = false;

xunit.runner.wpf/ViewModel/TraitViewModel.cs

@@ -7,7 +7,7 @@ namespace Xunit.Runner.Wpf.ViewModel
 {
     public partial class TraitViewModel : ViewModelBase
     {
-        private readonly TraitViewModel _parent;
+        private readonly TraitViewModel? _parent;
         private bool? _isChecked;
         private bool _isExpanded;
         private string _text;
@@ -19,7 +19,7 @@ namespace Xunit.Runner.Wpf.ViewModel
         {
         }
 
-        private TraitViewModel(TraitViewModel parent, string text)
+        private TraitViewModel(TraitViewModel? parent, string text)
         {
             this._parent = parent;
             this._isChecked = false;

xunit.runner.wpf/packages.config

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="CommonServiceLocator" version="1.3" targetFramework="net452" />
-  <package id="Microsoft.Net.Compilers" version="2.2.0" targetFramework="net46" developmentDependency="true" />
   <package id="MvvmLight" version="5.3.0.0" targetFramework="net46" />
   <package id="MvvmLightLibs" version="5.3.0.0" targetFramework="net46" />
   <package id="NuGet.CommandLine" version="2.8.3" targetFramework="net46" />

xunit.runner.wpf/xunit.runner.wpf.csproj

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
-  <Import Project="..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props" Condition="Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" />
   <Import Project="..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.props" Condition="Exists('..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.props')" />
   <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
   <PropertyGroup>
@@ -161,6 +160,7 @@
   <ItemGroup>
     <NuGetManifest Include="xunit.runner.wpf.nuspec">
       <Version>$(NuPkgVersion)</Version>
+      <PackageAnalysis>False</PackageAnalysis>
     </NuGetManifest>
   </ItemGroup>
   <ItemGroup>
@@ -202,6 +202,12 @@
   <ItemGroup>
     <Resource Include="Artwork\Application.ico" />
   </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Artwork\Running_large.png" />
+  </ItemGroup>
+  <ItemGroup>
+    <Resource Include="Artwork\Running_small.png" />
+  </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -209,7 +215,6 @@
     </PropertyGroup>
     <Error Condition="!Exists('..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.props'))" />
     <Error Condition="!Exists('..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.targets'))" />
-    <Error Condition="!Exists('..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\Microsoft.Net.Compilers.2.2.0\build\Microsoft.Net.Compilers.props'))" />
   </Target>
   <Import Project="..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.targets" Condition="Exists('..\packages\Tvl.NuGet.BuildTasks.1.0.0-alpha002\build\Tvl.NuGet.BuildTasks.targets')" />
 </Project>

xunit.runner.wpf/xunit.runner.wpf.nuspec

@@ -12,9 +12,9 @@
     <tags>XUnit Gui test runner</tags>
   </metadata>
   <files>
-    <file src="*.dll" target="tools\"/>
-    <file src="xunit.runner.wpf.targets" target="build"/>
-    <file src="*.exe" target="tools\" exclude="*vshost*"/>
-    <file src="*.config" target="tools\" exclude="*vshost*"/>
+    <file src="bin\$Configuration$\*.dll" target="tools\"/>
+    <file src="xunit.runner.wpf.targets" target="build\net45"/>
+    <file src="bin\$Configuration$\*.exe" target="tools\" exclude="**\*vshost*"/>
+    <file src="bin\$Configuration$\*.config" target="tools\" exclude="**\*vshost*"/>
   </files>
 </package>