diff --git a/tests/unit/test_instances.py b/tests/unit/test_instances.py
new file mode 100644
index 0000000..caeeb43
--- /dev/null
+++ b/tests/unit/test_instances.py
@@ -0,0 +1,47 @@
+# pylint: disable=redefined-outer-name
+import pytest
+
+from specklepy.core.api.models.instances import InstanceDefinitionProxy, InstanceProxy
+from specklepy.core.api.models.proxies import (
+    ColorProxy,
+    GroupProxy,
+)
+
+
+@pytest.fixture()
+def instance_proxy():
+    return InstanceProxy(
+        definitionId="definitionId", transform=[1, 23.5], units="unit", maxDepth=3
+    )
+
+
+@pytest.fixture()
+def instance_definition_proxy():
+    return InstanceDefinitionProxy(
+        objects=["app_id_1", "app_id_2"], maxDepth=2, name="group_proxy_name"
+    )
+
+
+def create_instance_proxy():
+    try:
+        InstanceProxy()  # missing parameters
+    except AssertionError:
+        assert True
+    try:
+        InstanceProxy(definitionId="", transform="", units="", maxDepth=1)  # wrong type
+    except AssertionError:
+        assert True
+
+    assert False
+
+
+def create_instance_definition_proxy():
+    try:
+        GroupProxy()  # missing parameters
+    except AssertionError:
+        assert True
+    try:
+        GroupProxy(objects="", maxDepth=1, name="")  # wrong type
+    except AssertionError:
+        assert True
+    assert False
diff --git a/tests/unit/test_proxies.py b/tests/unit/test_proxies.py
new file mode 100644
index 0000000..97a0828
--- /dev/null
+++ b/tests/unit/test_proxies.py
@@ -0,0 +1,44 @@
+# pylint: disable=redefined-outer-name
+import pytest
+
+from specklepy.core.api.models.proxies import (
+    ColorProxy,
+    GroupProxy,
+)
+
+
+@pytest.fixture()
+def color_proxy():
+    return ColorProxy(
+        objects=["app_id_1", "app_id_2"], value=11111, name="color_proxy_name"
+    )
+
+
+@pytest.fixture()
+def group_proxy():
+    return GroupProxy(objects=["app_id_1", "app_id_2"], name="group_proxy_name")
+
+
+def create_color_proxy():
+    try:
+        result = ColorProxy()  # missing parameters
+    except AssertionError:
+        assert True
+    try:
+        result = ColorProxy(objects="", value=2, name="")  # wrong type
+    except AssertionError:
+        assert True
+
+    assert False
+
+
+def create_group_proxy():
+    try:
+        result = GroupProxy()  # missing parameters
+    except AssertionError:
+        assert True
+    try:
+        result = GroupProxy(objects="", name="")  # wrong type
+    except AssertionError:
+        assert True
+    assert False