java - Junit 测试失败，如何解决？

Question

所以我正在使用 Junit 进行测试，对它来说还很陌生。我正在尝试在名为 SetOfUsers 的类中测试方法，如下所示:

 @Test
    public void testFindUserByName() {
        System.out.println("findUserByName");
        String name = "";
        SetOfUsers instance = new SetOfUsers();
        User expResult = null;
        User result = instance.findUserByName(name);
        assertEquals(expResult, result);
        // TODO review the generated test code and remove the default call to fail.

    }

所以我想检查在 Bob 中输入的用户名，例如在这样的名称字符串中

String name = "Bob";

因为我在 setOfUsers 类中有一个名为 Bob 的用户。
输出窗口显示此消息

Failed: expected:<null> but was:<Staff name:Bob, Staff pass:abc123>

我该怎么做才能通过？

Answer 1

了解 BDD ，这是使测试易于编写和理解(阅读)的非常好的技术

Test-driven development is a software development methodology which essentially states that for each unit of software, a software developer must:

• define a test set for the unit first;
• then implement the unit;
• finally verify that the implementation of the unit makes the tests succeed.

写得好的测试应该有GivenWhenThen部分

(Given) some context

(When) some action is carried out

(Then) a particular set of observable consequences should obtain

这种风格被称为SpecificationByExample

Given-When-Then is a style of representing tests - or as its advocates would say - specifying a system's behavior using SpecificationByExample.

示例测试

@Test
public void testFindUserByName() {

    // given
    SetOfUsers instance = new SetOfUsers();

    // when
    User result = instance.findUserByName("Bob");

    // then
    assertEquals("Bob", result.getName());

}

很高兴阅读:

• > Arrange Act Assert Alternatives
• > Maintainable Tests