test: Implement a simple test for copy-screens

tests/test_copy_screens.py

@@ -0,0 +1,29 @@
+from toolbox.api.datagalaxy_api import DataGalaxyApiAuthentication, Token
+from toolbox.api.datagalaxy_api_screens import DataGalaxyApiScreen
+from toolbox.commands.copy_screens import copy_screens
+import pytest as pytest
+
+
+def test_copy_screens_when_no_screen(mocker):
+    """
+    Scenario 1. error
+    :param mocker:
+    :return: raise Exception
+    """
+    client_space_mock = mocker.patch.object(Token, 'get_client_space_id', autospec=True)
+    client_space_mock.return_value = 'cid'
+    api_authenticate_mock = mocker.patch.object(DataGalaxyApiAuthentication, 'authenticate', autospec=True)
+    api_authenticate_mock.return_value = 'token'
+    source_screens_list_mock = mocker.patch.object(DataGalaxyApiScreen, 'list_screens', autospec=True)
+    source_screens_list_mock.return_value = []
+
+    # ASSERT / VERIFY
+    with pytest.raises(Exception, match='Unexpected error: source has no screen'):
+        copy_screens(
+            url_source='url_source',
+            url_target='url_target',
+            token_source='token_source',
+            token_target='token_target',
+            workspace_source_name=None,
+            workspace_target_name=None
+        )