diff --git a/python/cucim/tests/unit/test_init.py b/python/cucim/tests/unit/test_init.py
new file mode 100644
index 000000000..6cd7d5fd9
--- /dev/null
+++ b/python/cucim/tests/unit/test_init.py
@@ -0,0 +1,45 @@
+#
+# Copyright (c) 2021, NVIDIA CORPORATION.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+from unittest.mock import patch
+
+
+def test_is_available():
+    with patch('cucim._is_cupy_available', False):
+        with patch('cucim._is_clara_available', False):
+            import cucim
+            assert cucim.is_available() is False
+            assert cucim.is_available("skimage") is False
+            assert cucim.is_available("clara") is False
+            assert cucim.is_available("unknown") is False
+        with patch('cucim._is_clara_available', True):
+            import cucim
+            assert cucim.is_available() is False
+            assert cucim.is_available("skimage") is False
+            assert cucim.is_available("clara") is True
+            assert cucim.is_available("unknown") is False
+
+    with patch('cucim._is_cupy_available', True):
+        with patch('cucim._is_clara_available', False):
+            import cucim
+            assert cucim.is_available() is False
+            assert cucim.is_available("skimage") is True
+            assert cucim.is_available("clara") is False
+            assert cucim.is_available("unknown") is False
+        with patch('cucim._is_clara_available', True):
+            import cucim
+            assert cucim.is_available() is True
+            assert cucim.is_available("skimage") is True
+            assert cucim.is_available("clara") is True
+            assert cucim.is_available("unknown") is True
diff --git a/run b/run
index 9ef6401e8..528aa553c 100755
--- a/run
+++ b/run
@@ -720,7 +720,7 @@ test_python() {
 
     local testsuite=""
     local testsuite_unit_skimage="src"
-    local testsuite_unit_clara="tests/unit/clara"
+    local testsuite_unit_clara="tests/unit"
     local testsuite_performance="tests/performance"
 
     install_python_test_deps_