Add cmd integration test

integration_tests/context/tars/file

@@ -0,0 +1 @@
+normal file

integration_tests/dockerfiles/Dockerfile_test_add

@@ -0,0 +1,18 @@
+FROM gcr.io/google-appengine/debian9:latest
+# First, try adding some regular files
+ADD context/foo foo
+ADD context/foo /foodir/
+ADD context/bar/b* bar/
+ADD . newdir
+ADD ["context/foo", "/tmp/foo" ]
+
+# Next, make sure environment replacement works
+ENV contextenv ./context
+ADD $contextenv/* /tmp/${contextenv}/
+
+# Now, test extracting local tar archives
+ADD context/tars/fil* /tars/
+ADD context/tars/file.tar /tars_again
+
+# Finally, test adding a remote URL, concurrently with a normal file
+ADD https://github.com/GoogleCloudPlatform/docker-credential-gcr/releases/download/v1.4.3/docker-credential-gcr_linux_386-1.4.3.tar.gz context/foo /test/all/

integration_tests/dockerfiles/config_test_add.json

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

integration_tests/integration_test_yaml.go

@@ -57,6 +57,13 @@ var fileTests = []struct {
 		context:        "/workspace/integration_tests/",
 		repo:           "test-copy",
 	},
+	{
+		description:    "test add",
+		dockerfilePath: "/workspace/integration_tests/dockerfiles/Dockerfile_test_add",
+		configPath:     "/workspace/integration_tests/dockerfiles/config_test_add.json",
+		context:        "/workspace/integration_tests/",
+		repo:           "test-add",
+	},
 }
 
 var structureTests = []struct {