@@ -33,7 +33,7 @@ func newDriver(t *testing.T, name string) *Driver {

 	d, err := graphdriver.GetDriver(name, root, nil)

 	if err != nil {

 		if err == graphdriver.ErrNotSupported || err == graphdriver.ErrPrerequisites {

-			t.Skip("Driver %s not supported", name)

+			t.Skipf("Driver %s not supported", name)

 		}

 		t.Fatal(err)

 	}

@@ -112,7 +112,7 @@ func StoreImage(img *Image, layerData archive.ArchiveReader, root string) error

 		checksum := layerTarSum.Sum(nil)

 		if img.Checksum != "" && img.Checksum != checksum {

-			log.Warn("image layer checksum mismatch: computed %q, expected %q", checksum, img.Checksum)

+			log.Warnf("image layer checksum mismatch: computed %q, expected %q", checksum, img.Checksum)

 		}

 		img.Checksum = checksum

@@ -220,7 +220,7 @@ func TestEventsImagePull(t *testing.T) {

 	since := time.Now().Unix()

 	pullCmd := exec.Command(dockerBinary, "pull", "scratch")

 	if out, _, err := runCommandWithOutput(pullCmd); err != nil {

-		t.Fatal("pulling the scratch image from has failed: %s, %v", out, err)

+		t.Fatalf("pulling the scratch image from has failed: %s, %v", out, err)

 	}

 	eventsCmd := exec.Command(dockerBinary, "events",

@@ -11,7 +11,7 @@ import (

 func TestNetworkNat(t *testing.T) {

 	iface, err := net.InterfaceByName("eth0")

 	if err != nil {

-		t.Skip("Test not running with `make test`. Interface eth0 not found: %s", err)

+		t.Skipf("Test not running with `make test`. Interface eth0 not found: %s", err)

 	}

 	ifaceAddrs, err := iface.Addrs()