使用 Mockito 2 模拟服务导致存根错误 [英] Simulation of Service using Mockito 2 leads to stubbing error

问题描述

我尝试使用 Mockito 模拟类的行为.这使用 Mockito 1.x 工作.迁移到 JUnit 5 和 Mockito 2 似乎不再起作用.

I try to simulate the behaviour of a class, using Mockito. This worked using Mockito 1.x. Migrating to JUnit 5 and Mockito 2 it seems not to work anymore.

@ExtendWith(MockitoExtension.class)
public class MockitoExample {

  static abstract class TestClass {
    public abstract int booleanMethod(boolean arg);
  }

  @Mock
  TestClass testClass;

  @BeforeEach
  public void beforeEach() {
    when(testClass.booleanMethod(eq(true))).thenReturn(1);
    when(testClass.booleanMethod(eq(false))).thenReturn(2);
  }

  @Test
  public void test() {
    assertEquals(1,testClass.booleanMethod(true));
    assertEquals(2,testClass.booleanMethod(false));
  }
}

期望是，模拟的 TestClass 显示在测试方法中测试的行为.

The expectation is, that the mocked TestClass shows the behaviour as tested in the test-method.

我得到的错误是:

org.mockito.exceptions.misusing.PotentialStubbingProblem: 

  Strict stubbing argument mismatch. Please check:
   - this invocation of 'booleanMethod' method:
      testClass.booleanMethod(false);
      -> at org.oneandone.ejbcdiunit.mockito_example.MockitoExample.beforeEach(MockitoExample.java:30)
   - has following stubbing(s) with different arguments:
      1. testClass.booleanMethod(false);
        -> at org.oneandone.ejbcdiunit.mockito_example.MockitoExample.beforeEach(MockitoExample.java:29)
  Typically, stubbing argument mismatch indicates user mistake when writing tests.
  Mockito fails early so that you can debug potential problem easily.
  However, there are legit scenarios when this exception generates false negative signal:
    - stubbing the same method multiple times using 'given().will()' or 'when().then()' API
      Please use 'will().given()' or 'doReturn().when()' API for stubbing.
    - stubbed method is intentionally invoked with different arguments by code under test
      Please use default or 'silent' JUnit Rule (equivalent of Strictness.LENIENT).
  For more information see javadoc for PotentialStubbingProblem class.

在这两种情况下，参数 false 似乎是匹配的，尽管我显然与 true 匹配.

In both cases, the argument false seems to be matched, though I clearly matched with true.

这是 Mockito 2.17 中的错误还是误解.我应该/如何使用 Mockito 2.x 来模拟​​具有不同布尔参数的调用?

Is that a bug in Mockito 2.17 or a misunderstanding. How should/can I use Mockito 2.x to simulate calls with different boolean arguments?

example 也可以在 github 上找到.但是surefire只会使用

The example can also be found on github. But surefire will start the test only using

mvn test -Dtest=MockitoExample

使用 Mockito 2.21 执行测试会得到相同的结果.

Executing the test using Mockito 2.21 leads to the same results.

推荐答案

从 Mockito 2.20 开始，也可以在本地添加 lenient()

Since Mockito 2.20 it is also possible, to add lenient() locally

@ExtendWith(MockitoExtension.class)
public class MockitoExample {

  static abstract class TestClass {
    public abstract int booleanMethod(boolean arg);
  }

  @Mock
  TestClass testClass;

  @BeforeEach
  public void beforeEach() {
    lenient().when(testClass.booleanMethod(eq(true))).thenReturn(1);
    lenient().when(testClass.booleanMethod(eq(false))).thenReturn(2);
  }

  @Test
  public void test() {
    assertEquals(1,testClass.booleanMethod(true));
    assertEquals(2,testClass.booleanMethod(false));
  }
}

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