Cover Another Test Case

See: aws#6909

tests/unit/lib/build_module/test_app_builder.py

@@ -1756,7 +1756,7 @@ def test_loads_image_archive(self, mock_open):
         self.assertEqual(id, image)
 
     @patch("builtins.open", new_callable=mock_open)
-    def test_must_represent_a_single_image(self, mock_open):
+    def test_archive_must_represent_a_single_image(self, mock_open):
         self.docker_client_mock.images.load.return_value = [
             Mock(id="sha256:1a2b3c4d5e6f"),
             Mock(id="sha256:1f2e3d4c5b6a"),

tests/unit/lib/package/test_ecr_uploader.py

@@ -1,3 +1,5 @@
+import docker
+
 from unittest import TestCase
 from unittest.mock import MagicMock, Mock, call, mock_open, patch
 
@@ -288,6 +290,27 @@ def test_upload_failure_if_archive_represents_multiple_images(self, mock_open, m
         with self.assertRaises(DockerPushFailedError):
             ecr_uploader.upload(image, resource_name=resource_name)
 
+    @patch.object(Path, "is_file", return_value=False)
+    def test_upload_failure_if_image_archive_does_not_exist(self, mock_is_file):
+        resource_name = "HelloWorldFunction"
+        image = "./path/to/archive.tar.gz"
+
+        # this error is raised because we ask the docker service for an image
+        # with an id or tag which resembles a file path (as `image` above)
+        self.docker_client.images.get.side_effect = docker.errors.ImageNotFound("no such image")
+
+        ecr_uploader = ECRUploader(
+            docker_client=self.docker_client,
+            ecr_client=self.ecr_client,
+            ecr_repo=self.ecr_repo,
+            ecr_repo_multi=self.ecr_repo_multi,
+            tag=self.tag,
+        )
+        ecr_uploader.login = MagicMock()
+
+        with self.assertRaises(DockerPushFailedError):
+            ecr_uploader.upload(image, resource_name=resource_name)
+
     @patch("samcli.lib.package.ecr_uploader.click.echo")
     def test_delete_artifact_successful(self, patched_click_echo):
         ecr_uploader = ECRUploader(