@Test(expected = NullPointerException.class)
public void shouldThrowNullPointerExceptionIfNullMapperPassedToMapSecond() throws Exception {
// Given
Triple<Integer, String, Boolean> triple = tuple(5, "Five", true);
Mapper<String, Integer> mapper = null;
// When
triple.mapSecond(mapper);
// Then a NullPointerException is thrown
}
@Test
public void shouldBeMappableUsingUnaryFunctionOnSecondPosition() throws Exception {
// Given
Triple<Integer, String, Boolean> triple = tuple(5, "Five", true);
UnaryFunction<String, Integer> function =
new UnaryFunction<String, Integer>() {
@Override
public Integer call(String input) {
return input.length();
}
};
Triple<Integer, Integer, Boolean> expected = tuple(5, 4, true);
// When
Triple<Integer, Integer, Boolean> actual = triple.mapSecond(function);
// Then
assertThat(actual, is(expected));
}