Added integration test, minor changes to files

integration_tests/dockerfiles/Dockerfile_test_run

@@ -1,3 +1,17 @@
+# Copyright 2018 Google, Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 FROM gcr.io/google-appengine/debian9
 RUN echo "hey" > /etc/foo
 RUN apt-get update && apt-get install -y \

integration_tests/dockerfiles/Dockerfile_test_run_2

@@ -0,0 +1,19 @@
+# Copyright 2018 Google, Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Test to make sure the executor builds an image correctly
+# when no files are changed
+
+FROM gcr.io/google-appengine/debian9
+RUN echo "hey" 

integration_tests/dockerfiles/config_test_run.json

@@ -45,4 +45,4 @@
       ]
     }
   }
-]
+]

integration_tests/dockerfiles/config_test_run_2.json

@@ -0,0 +1,12 @@
+[
+  {
+    "Image1": "gcr.io/kbuild-test/docker-test-run-2:latest",
+    "Image2": "gcr.io/kbuild-test/kbuild-test-run-2:latest",
+    "DiffType": "File",
+    "Diff": {
+      "Adds": null,
+      "Dels": null,
+      "Mods": null
+    }
+  }
+]

integration_tests/integration_test_yaml.go

@@ -42,6 +42,13 @@ var tests = []struct {
 		context:        "integration_tests/dockerfiles/",
 		repo:           "test-run",
 	},
+	{
+		description:    "test run no files changed",
+		dockerfilePath: "/workspace/integration_tests/dockerfiles/Dockerfile_test_run_2",
+		configPath:     "/workspace/integration_tests/dockerfiles/config_test_run_2.json",
+		context:        "integration_tests/dockerfiles/",
+		repo:           "test-run-2",
+	},
 }
 
 type step struct {