added test for pulling from docker registry

integration_tests/dockerfiles/Dockerfile_test_registry

@@ -0,0 +1,2 @@
+FROM busybox
+RUN echo "hey" > /hey

integration_tests/dockerfiles/config_test_registry.json

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

integration_tests/dockerfiles/config_test_run.json

@@ -14,8 +14,8 @@
         },
         {
           "Name": "/var/log/apt/term.log",
-          "Size1": 24421,
-          "Size2": 24421
+          "Size1": 23671,
+          "Size2": 23671
         },
         {
           "Name": "/var/cache/ldconfig/aux-cache",
@@ -24,8 +24,8 @@
         },
         {
           "Name": "/var/log/apt/history.log",
-          "Size1": 5415,
-          "Size2": 5415
+          "Size1": 5661,
+          "Size2": 5661
         },
         {
           "Name": "/var/log/alternatives.log",

integration_tests/integration_test_yaml.go

@@ -110,6 +110,14 @@ var fileTests = []struct {
 		kbuildContext:  buildcontextPath,
 		repo:           "test-add",
 	},
+	{
+		description:    "test registry",
+		dockerfilePath: "/workspace/integration_tests/dockerfiles/Dockerfile_test_registry",
+		configPath:     "/workspace/integration_tests/dockerfiles/config_test_registry.json",
+		dockerContext:  buildcontextPath,
+		kbuildContext:  buildcontextPath,
+		repo:           "test-registry",
+	},
 }
 
 var structureTests = []struct {