expectedResult string
	}{
		{bf, "off"},
		{BoolFlag(true), "on"},
		{BoolFlag(false), "off"},
	}

	for _, testCase := range testCases {
		str := testCase.flag.String()
		if testCase.expectedResult != str {
			t.Fatalf("expected: %v, got: %v", testCase.expectedResult, str)
		}
	}
}

// Test BoolFlag.MarshalJSON()
func TestBoolFlagMarshalJSON(t *testing.T) {
	var bf BoolFlag

	testCases := []struct {