Write get_missing_filenames

jardin.py

@@ -51,6 +51,15 @@ def get_garden_filenames(browser):
 def get_local_filenames(directory):
     return os.listdir(directory)
 
+def get_missing_filenames(localFiles, gardenFiles):
+    missingFilenames = []
+
+    for localFile in localFiles:
+        if localFile not in gardenFiles:
+            missingFilenames.append(localFile)
+
+    return missingFilenames
+
 def main(email, password, directory):
     browser = initialize_webdriver()
     navigate_to_filegarden(browser)

test_jardin.py

@@ -125,6 +125,14 @@ class TestJardin(unittest.TestCase):
         mockListdir.assert_called_once_with(mockDirectory)
         self.assertEqual(localFiles, mockFiles)
 
+    def test_get_missing_filenames_returns_local_filenames_without_garden_filenames(self):
+        mockLocalFilenames = ["file1.jpg", "file2.jpg", "file3.jpg", "file4.jpg", "file5.jpg"]
+        mockGardenFilenames = ["file2.jpg", "file4.jpg", "file6.jpg", "file8.jpg", "file10.jpg"]
+
+        missingFilenames = jardin.get_missing_filenames(mockLocalFilenames, mockGardenFilenames)
+
+        self.assertEqual(missingFilenames, ["file1.jpg", "file3.jpg", "file5.jpg"])
+
     @patch("jardin.initialize_webdriver")
     @patch("jardin.navigate_to_filegarden")
     @patch("jardin.login_with_password")