Test function from external repository can be used in airflow-dags project

lib/test_funtion_import_from_external_repository.py

@@ -0,0 +1,23 @@
+import subprocess
+import unittest
+
+
+class TestUsingFunctionsFromExternalRepo(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        """Install treetracker functions repository as a package"""
+        cls.result = subprocess.run(
+            ["pip3", "install", "git+https://github.com/Greenstand/treetracker-functions.git@dev"
+                                "#egg=functions"]
+            , stdout=subprocess.PIPE)
+
+    def test_treetracker_functions_repository_is_successfully_installed(self):
+        self.assertEqual(self.result.returncode, 0)
+
+    def test_hello_function_from_tree_tracker_functions_repository(self):
+        from functions.refresh_view import hello  # noqa
+        self.assertEqual(hello('Chen'), 'Hello, Chen!')
+
+
+if __name__ == "__main__":
+    unittest.main()