diff --git a/test/python_unit/test_case.py b/test/python_unit/test_case.py
new file mode 100644
index 0000000000000000000000000000000000000000..e6bec282b6e9af3a6d2c936260764c182c90760c
--- /dev/null
+++ b/test/python_unit/test_case.py
@@ -0,0 +1,7 @@
+import unittest
+import numpy as np
+
+class TestCase(unittest.TestCase):
+    def assertApprox(self, a, b, epsilon=1e-6):
+        return self.assertTrue(np.allclose(a, b, epsilon), "%s !~= %s" % (a, b))
+