Adds unit test for catching SDKs not installed

Adding test to make coverage not complain, and to
also validate that if the environment variables are present
that things wont break if the right SDK is not installed.

tests/test_driver.py

@@ -0,0 +1,33 @@
+import os
+import unittest
+from unittest.mock import patch
+
+from naturf import driver
+
+
+class TestDriverGuardAgainstSDK(unittest.TestCase):
+    INPUTS = {
+        "input_shapefile": os.path.join("naturf", "data", "C-5.shp"),
+        "radius": 100,
+        "cap_style": 1,
+    }
+
+    # mock the driver module variables
+    @patch("naturf.driver.HAMILTON_UI_PROJECT_ID", "3")
+    @patch("naturf.driver.HAMILTON_UI_USERNAME", "test@test")
+    def tests_sdk_not_installed(self):
+        """tests that things work if the sdk is not installed"""
+        # this line running without error means that our checks worked
+        driver.Model(inputs=TestDriverGuardAgainstSDK.INPUTS, outputs=["input_shapefile_df"])
+
+    @patch("naturf.driver.HAMILTON_UI_PROJECT_ID", "3")
+    @patch("naturf.driver.HAMILTON_UI_USERNAME", "test@test")
+    @patch("naturf.driver.DAGWORKS_API_KEY", "some-api-key")
+    def tests_sdk_not_installed_DW(self):
+        """tests that things work if the sdk is not installed for the DW path"""
+        # this line running without error means that our checks worked
+        driver.Model(inputs=TestDriverGuardAgainstSDK.INPUTS, outputs=["input_shapefile_df"])
+
+
+if __name__ == "__main__":
+    unittest.main()