Add new test for required flags

examples_test.go

@@ -97,7 +97,6 @@ func ExampleCommand_Run_appHelp() {
 		},
 		Flags: []cli.Flag{
 			&cli.StringFlag{Name: "name", Value: "bob", Usage: "a name to say"},
-			&cli.StringFlag{Name: "id", Value: "abcd-dndndnd", Usage: "an id", Required: true},
 		},
 		Commands: []*cli.Command{
 			{
@@ -118,7 +117,7 @@ func ExampleCommand_Run_appHelp() {
 	defer cancel()
 
 	// Simulate the command line arguments
-	os.Args = []string{"greet", "--id", "foo-x", "help"}
+	os.Args = []string{"greet", "help"}
 
 	_ = cmd.Run(ctx, os.Args)
 	// Output:
@@ -144,7 +143,6 @@ func ExampleCommand_Run_appHelp() {
 	//
 	// GLOBAL OPTIONS:
 	//    --name value   a name to say (default: "bob")
-	//    --id value     an id
 	//    --help, -h     show help (default: false)
 	//    --version, -v  print the version (default: false)
 }

help_test.go

@@ -65,6 +65,36 @@ func Test_ShowAppHelp_MultiLineDescription(t *testing.T) {
 	}
 }
 
+func Test_Help_RequiredFlagsNoDefault(t *testing.T) {
+	output := new(bytes.Buffer)
+
+	cmd := &Command{
+		Flags: []Flag{
+			&IntFlag{Name: "foo", Aliases: []string{"f"}, Required: true},
+		},
+		Writer: output,
+	}
+
+	_ = cmd.Run(buildTestContext(t), []string{"test", "-h"})
+
+	expected := `NAME:
+   test - A new cli application
+
+USAGE:
+   test [global options] [command [command options]] [arguments...]
+
+COMMANDS:
+   help, h  Shows a list of commands or help for one command
+
+GLOBAL OPTIONS:
+   --foo value, -f value  
+   --help, -h             show help (default: false)
+`
+
+	assert.Contains(t, output.String(), expected,
+		"expected output to include usage text")
+}
+
 func Test_Help_Custom_Flags(t *testing.T) {
 	oldFlag := HelpFlag
 	defer func() {