if testCase.expectedResult != string(data) {
			t.Fatalf("expected: %v, got: %v", testCase.expectedResult, string(data))
		}
	}
}

// Test BoolFlag.UnmarshalJSON()
func TestBoolFlagUnmarshalJSON(t *testing.T) {
	testCases := []struct {
		data           []byte
		expectedResult BoolFlag
		expectedErr    bool
	}{
		{[]byte(`{}`), BoolFlag(false), true},
		{[]byte(`["on"]`), BoolFlag(false), true},