cleanup tests, check required flags in more places

app.go

@@ -339,13 +339,6 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 		return nerr
 	}
 
-	cerr := checkRequiredFlags(a.Flags, set)
-	if cerr != nil {
-		showFlagError(a.Writer, cerr)
-		ShowSubcommandHelp(context)
-		return cerr
-	}
-
 	if checkCompletions(context) {
 		return nil
 	}
@@ -371,6 +364,13 @@ func (a *App) RunAsSubcommand(ctx *Context) (err error) {
 		}
 	}
 
+	cerr := checkRequiredFlags(a.Flags, set)
+	if cerr != nil {
+		showFlagError(a.Writer, cerr)
+		ShowSubcommandHelp(context)
+		return cerr
+	}
+
 	if a.After != nil {
 		defer func() {
 			afterErr := a.After(context)

app_test.go

@@ -877,54 +877,38 @@ func TestAppNoHelpFlag(t *testing.T) {
 	}
 }
 
-// TestRequiredFlagAppRunBehavior tests the app-wide behavior of required flags
-// and how they interact with the error response and help messages.
-// A different test (`TestCheckRequiredFlags`) exists for the more fine grain
-// behavior of required flags.
 func TestRequiredFlagAppRunBehavior(t *testing.T) {
 	tdata := []struct {
-		testCase                 string
-		flags                    []Flag
-		appRunInput              []string
-		expectedHelpPrinter      bool
-		expectedAnError          bool
-		expectedFlagErrorPrinter bool
+		testCase        string
+		flags           []Flag
+		appRunInput     []string
+		expectedAnError bool
 	}{
 		{
 			// expectations:
 			// 	- empty input, when a required flag is present, shows the help message
-			// 	- empty input, when a required flag is present, errors
-			// 	- empty input, when a required flag is present, show the flag error message
-			testCase:                 "empty_input_with_required_flag",
-			appRunInput:              []string{"command"},
-			flags:                    []Flag{StringFlag{Name: "requiredFlag", Required: true}},
-			expectedHelpPrinter:      true,
-			expectedAnError:          true,
-			expectedFlagErrorPrinter: true,
+			// 	- empty input, when a required flag is present, errors and shows the flag error message
+			testCase:        "empty_input_with_required_flag",
+			appRunInput:     []string{"command"},
+			flags:           []Flag{StringFlag{Name: "requiredFlag", Required: true}},
+			expectedAnError: true,
 		},
 		{
 			// expectations:
 			// 	- inputing --help, when a required flag is present, shows the help message
-			// 	- inputing --help, when a required flag is present, explicitly does not error
-			// 	- inputing --help, when a required flag is present, explicitly does not show the flag error message
-			testCase:                 "help_input_with_required_flag",
-			appRunInput:              []string{"command", "--help"},
-			flags:                    []Flag{StringFlag{Name: "requiredFlag", Required: true}},
-			expectedHelpPrinter:      true,
-			expectedAnError:          false, // explicit false for readability (this is the default value)
-			expectedFlagErrorPrinter: false, // explicit false for readability (this is the default value)
+			// 	- inputing --help, when a required flag is present, does not error
+			testCase:    "help_input_with_required_flag",
+			appRunInput: []string{"command", "--help"},
+			flags:       []Flag{StringFlag{Name: "requiredFlag", Required: true}},
 		},
 		{
 			// expectations:
 			// 	- giving optional input, when a required flag is present, shows the help message
-			// 	- giving optional input, when a required flag is present, errors
-			// 	- giving optional input, when a required flag is present, shows the flag error message
-			testCase:                 "optional_input_with_required_flag",
-			appRunInput:              []string{"command", "--optional", "cats"},
-			flags:                    []Flag{StringFlag{Name: "requiredFlag", Required: true}, StringFlag{Name: "optional"}},
-			expectedHelpPrinter:      true,
-			expectedAnError:          true,
-			expectedFlagErrorPrinter: true,
+			// 	- giving optional input, when a required flag is present, errors and shows the flag error message
+			testCase:        "optional_input_with_required_flag",
+			appRunInput:     []string{"command", "--optional", "cats"},
+			flags:           []Flag{StringFlag{Name: "requiredFlag", Required: true}, StringFlag{Name: "optional"}},
+			expectedAnError: true,
 		},
 	}
 	for _, test := range tdata {
@@ -935,9 +919,9 @@ func TestRequiredFlagAppRunBehavior(t *testing.T) {
 				showFlagError = oldShowError
 			}()
 			// setup - mock showFlagError
-			var showErrorWasCalled = false
+			var showFlagErrorWasCalled = false
 			showFlagError = func(writer io.Writer, err ...interface{}) (int, error) {
-				showErrorWasCalled = true
+				showFlagErrorWasCalled = true
 				return 0, nil
 			}
 			// setup - undo HelpPrinter mock when finished
@@ -953,26 +937,20 @@ func TestRequiredFlagAppRunBehavior(t *testing.T) {
 			// setup - app
 			app := NewApp()
 			app.Flags = test.flags
-			app.Commands = []Command{
-				Command{
-					Name:  "command",
-					Flags: test.flags,
-				},
-			}
 
 			// logic under test
 			err := app.Run(test.appRunInput)
 
 			// assertions
-			if test.expectedHelpPrinter && helpPrinterWasCalled == false {
+			if helpPrinterWasCalled == false {
 				t.Errorf("HelpPrinter expected to be called, but was not")
 			}
-			if test.expectedFlagErrorPrinter && showErrorWasCalled == false {
-				t.Errorf("showFlagError expected to be called, but was not")
-			}
 			if test.expectedAnError && err == nil {
 				t.Errorf("expected an error, but there was none")
 			}
+			if test.expectedAnError && showFlagErrorWasCalled == false {
+				t.Errorf("showFlagError expected to be called, but was not")
+			}
 			if !test.expectedAnError && err != nil {
 				t.Errorf("did not expected an error, but there was one: %s", err)
 			}

command.go

@@ -135,6 +135,13 @@ func (c Command) Run(ctx *Context) (err error) {
 		return nil
 	}
 
+	cerr := checkRequiredFlags(c.Flags, set)
+	if cerr != nil {
+		showFlagError(context.App.Writer, cerr)
+		ShowCommandHelp(context, c.Name)
+		return cerr
+	}
+
 	if c.After != nil {
 		defer func() {
 			afterErr := c.After(context)