App inspect requires exactly one arg

Signed-off-by: Djordje Lukic <[email protected]>

Author: rumpl

e2e/commands_test.go

@@ -161,7 +161,7 @@ func TestInspectApp(t *testing.T) {
 		cmd.Dir = dir.Path()
 		icmd.RunCmd(cmd).Assert(t, icmd.Expected{
 			ExitCode: 1,
-			Err:      "could not parse '' as a valid reference",
+			Err:      `"docker app inspect" requires exactly 1 argument.`,
 		})
 
 		cmd.Command = dockerCli.Command("app", "build", filepath.Join("testdata", "simple", "simple.dockerapp"), "--tag", "simple-app:1.0.0")

internal/commands/inspect.go

@@ -23,7 +23,7 @@ func inspectCmd(dockerCli command.Cli) *cobra.Command {
 		Short: "Shows metadata, parameters and a summary of the Compose file for a given application",
 		Example: `$ docker app inspect my-installed-app
 $docker app inspect my-app:1.0.0`,
-		Args: cli.RequiresMaxArgs(1),
+		Args: cli.ExactArgs(1),
 		RunE: func(cmd *cobra.Command, args []string) error {
 			return runInspect(dockerCli, firstOrEmpty(args), opts)
 		},