Update unit test in order to comply with new api
diff --git a/container_test.go b/container_test.go
index fef5331..1a23d73 100644
--- a/container_test.go
+++ b/container_test.go
@@ -193,7 +193,7 @@
 	if err != nil {
 		t.Error(err)
 	}
-	img, err := runtime.graph.Create(rwTar, container1, "unit test commited image - diff", "")
+	img, err := runtime.graph.Create(rwTar, container1, "unit test commited image - diff", "", nil)
 	if err != nil {
 		t.Error(err)
 	}
@@ -258,7 +258,7 @@
 	if err != nil {
 		t.Error(err)
 	}
-	img, err := runtime.graph.Create(rwTar, container1, "unit test commited image", "")
+	img, err := runtime.graph.Create(rwTar, container1, "unit test commited image", "", nil)
 	if err != nil {
 		t.Error(err)
 	}
diff --git a/graph_test.go b/graph_test.go
index 1bd05aa..b7ec816 100644
--- a/graph_test.go
+++ b/graph_test.go
@@ -62,7 +62,7 @@
 	if err != nil {
 		t.Fatal(err)
 	}
-	image, err := graph.Create(archive, nil, "Testing", "")
+	image, err := graph.Create(archive, nil, "Testing", "", nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -122,7 +122,7 @@
 	if err != nil {
 		t.Fatal(err)
 	}
-	image, err := graph.Create(archive, nil, "Testing", "")
+	image, err := graph.Create(archive, nil, "Testing", "", nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -166,7 +166,7 @@
 	if err != nil {
 		t.Fatal(err)
 	}
-	img, err := graph.Create(archive, nil, "Test image", "")
+	img, err := graph.Create(archive, nil, "Test image", "", nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -181,7 +181,7 @@
 		t.Fatal(err)
 	}
 	assertNImages(graph, t, 0)
-	img, err := graph.Create(archive, nil, "Bla bla", "")
+	img, err := graph.Create(archive, nil, "Bla bla", "", nil)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -192,11 +192,11 @@
 	assertNImages(graph, t, 0)
 
 	// Test 2 create (same name) / 1 delete
-	img1, err := graph.Create(archive, nil, "Testing", "")
+	img1, err := graph.Create(archive, nil, "Testing", "", nil)
 	if err != nil {
 		t.Fatal(err)
 	}
-	if _, err = graph.Create(archive, nil, "Testing", ""); err != nil {
+	if _, err = graph.Create(archive, nil, "Testing", "", nil); err != nil {
 		t.Fatal(err)
 	}
 	assertNImages(graph, t, 2)