@@ -4563,6 +4563,41 @@ func TestBuildLabels(t *testing.T) {

 	logDone("build - label")

 }

+func TestBuildLabelsCache(t *testing.T) {

+	name := "testbuildlabelcache"

+	defer deleteImages(name)

+

+	id1, err := buildImage(name,

+		`FROM busybox

+		LABEL Vendor=Acme`, false)

+	if err != nil {

+		t.Fatalf("Build 1 should have worked: %v", err)

+	}

+

+	id2, err := buildImage(name,

+		`FROM busybox

+		LABEL Vendor=Acme`, true)

+	if err != nil || id1 != id2 {

+		t.Fatalf("Build 2 should have worked & used cache(%s,%s): %v", id1, id2, err)

+	}

+

+	id2, err = buildImage(name,

+		`FROM busybox

+		LABEL Vendor=Acme1`, true)

+	if err != nil || id1 == id2 {

+		t.Fatalf("Build 2 should have worked & NOT used cache(%s,%s): %v", id1, id2, err)

+	}

+

+	id2, err = buildImage(name,

+		`FROM busybox

+		LABEL Vendor Acme`, true) // Note: " " and "=" should be same

+	if err != nil || id1 != id2 {

+		t.Fatalf("Build 3 should have worked & used cache(%s,%s): %v", id1, id2, err)

+	}

+

+	logDone("build - label cache")

+}

+

 func TestBuildStderr(t *testing.T) {

 	// This test just makes sure that no non-error output goes

 	// to stderr