test: fix TestRunWithoutCapability not take effect

fix TestRunWithoutCapability not check error, test alway get pass
even the test is fail.

Signed-off-by: Ace-Tang <aceapril@126.com>

test/cli_run_test.go

@@ -223,13 +223,15 @@ func (suite *PouchRunSuite) TestRunWithCapability(c *check.C) {
 
 // TestRunWithoutCapability tests running container with --cap-drop
 func (suite *PouchRunSuite) TestRunWithoutCapability(c *check.C) {
-	capability := "chown"
+	capability := "CHOWN"
 	name := "run-capability"
 	expt := icmd.Expected{
-		Err: "Operation not permitted",
+		ExitCode: 1,
+		Out:      "Operation not permitted",
 	}
-	command.PouchRun("run", "--name", name, "--cap-drop", capability,
+	err := command.PouchRun("run", "--name", name, "--cap-drop", capability,
 		busyboxImage, "chown", "755", "/tmp").Compare(expt)
+	c.Assert(err, check.IsNil)
 	defer DelContainerForceMultyTime(c, name)
 }