嘲笑链式电话

Question

正在测试的类是测试classedclass，该级具有一个名为" Inner"的字段，来自类型InnerClass。

Class TestedClass{
  InnerClass inner;
  public void methodToTest() {
     inner.getSomething().AddSomething(new Something());
  }
}

在我的测试中，我为"内部"创建了一个模拟，无法弄清楚如何测试方法托端，我尝试过的所有选项都不编译并从Mockito那里获得例外。嘲笑和测试这种情况的正确方法是什么？

谢谢。

Answer 1

您应该在TestedClass初始化期间注入InnerClass模拟。例如，您应该有一个构造函数：

class Something {
    void addSomething(Something sth) {
    }
}
class InnerClass {
    Something getSomething() {
        return new Something();
    }
}
class TestClass {
    private final InnerClass inner;
    TestClass(InnerClass inner) {
        this.inner = inner;
    }
    public void methodToTest() {
        inner.getSomething().addSomething(new Something());
    }
}

，验证调用的测试将是：

@Test
public void shouldInvokeInnerClassMethod() {
    InnerClass innerMock = Mockito.mock(InnerClass.class);
    TestClass testSubject = new TestClass(innerMock);
    testSubject.methodToTest();
    verify(innerMock).getSomething();
}

如果您想测试传递给addSometing方法的值：

@Test
public void shouldAddSomething() {
    ArgumentCaptor<Something> somethingCaptor = ArgumentCaptor.forClass(Something.class);
    Something somethingMock = Mockito.mock(Something.class);
    InnerClass innerMock = Mockito.mock(InnerClass.class);
    when(innerMock.getSomething()).thenReturn(somethingMock);
    TestClass testSubject = new TestClass(innerMock);
    testSubject.methodToTest();
    verify(somethingMock).addSomething(somethingCaptor.capture());
    Something addedSomething = somethingCaptor.getValue();
    //assertions on addedSomething content
}