@@ -47,7 +47,7 @@ func (s *DockerSuite) TestDiffEnsureInitLayerFilesAreIgnored(c *check.C) {

 	}

 }

-func (s *DockerSuite) TestDiffEnsureOnlyKmsgAndPtmx(c *check.C) {

+func (s *DockerSuite) TestDiffEnsureDefaultDevs(c *check.C) {

 	testRequires(c, DaemonIsLinux)

 	out, _ := dockerCmd(c, "run", "-d", "busybox", "sleep", "0")

@@ -75,7 +75,7 @@ func (s *DockerSuite) TestDiffEnsureOnlyKmsgAndPtmx(c *check.C) {

 	}

 	for _, line := range strings.Split(out, "\n") {

-		c.Assert(line == "" || expected[line], checker.True)

+		c.Assert(line == "" || expected[line], checker.True, check.Commentf(line))

 	}

 }