使用自定义对象的参数化测试

Question

void add() {
    student5 =  new Student("student5", LocalDate.of(2000,5,12), "none");
    studentSet2.add(student5);
    assertAll(
            ()->assertThat(studentSet2).contains(student5),
            ()->assertThat(studentSet2).hasSize(1),
            ()->assertThat(studentSet2.iterator().next()).isEqualTo(student5),
            ()->assertThat(studentSet2.toArray(new Student[1])).containsOnly(student5)
    );

Answer 1

您需要创建大量的合成案例（或者从某个地方读取…)，例如

static Stream<Arguments> testAddToAListSource() {
    final List<String> baseData = List.of("one", "two", "three");
    
    // construct cases using a base list and adding null or a new element
    return IntStream.range(0, baseData.size() + 1)
            .mapToObj(n -> baseData.stream().limit(n).collect(toList()))
            .flatMap(xs -> Stream.of(null, "extra", "superExtra")
                .map(x -> arguments(new ArrayList<>(xs), x)));
}

此方法创建字符串列表和要添加的新字符串的对。

假设您希望检查以下不变量，以验证此元素是否正确添加到列表中

@ParameterizedTest
@MethodSource("testAddToAListSource")
void testAddToAList(List<String> caseList, String newElement) {

    // count elements
    final long currentSize = caseList.size();

    // count how many times the element is in list
    final long currentTimes = caseList.stream().filter(e -> Objects.equals(e, newElement)).count();

    // add
    caseList.add(newElement);

    // count elements
    final long newSize = caseList.size();

    // count how many times the element is in list
    final long newTimes = caseList.stream().filter(e -> Objects.equals(e, newElement)).count();

    assertEquals(newSize, currentSize + 1);
    assertEquals(newTimes, currentTimes + 1);
}

@ParameterizedTest
@MethodSource("testAdd")
void add(StudentSet studentSet2, Student student5) {
    ...

static Stream<Arguments> testAdd() {
    ...