Mockito：如何在方法中创建的对象上调用方法？ [英] Mockito : how to verify method was called on an object created within a method?

问题描述

我是Mockito的新手。

I am new to Mockito.

鉴于下面的课程，如何使用Mockito验证 someMethod 在调用 foo 之后调用了一次？

Given the class below, how can I use Mockito to verify that someMethod was invoked exactly once after foo was invoked?

public class Foo
{
    public void foo(){
        Bar bar = new Bar();
        bar.someMethod();
    }
}

我想进行以下验证电话，

I would like to make the following verification call,

verify(bar, times(1)).someMethod();

其中 bar 是<的模拟实例code> Bar 。

推荐答案

依赖注入

如果您注入Bar实例或用于创建的工厂Bar实例（或其他483种方法之一），您可以进行必要的访问以执行测试。

If you inject the Bar instance, or a factory that is used for creating the Bar instance (or one of the other 483 ways of doing this), you'd have the access necessary to do perform the test.

工厂示例：

给定一个这样写的Foo类：

Given a Foo class written like this:

public class Foo {
  private BarFactory barFactory;

  public Foo(BarFactory factory) {
    this.barFactory = factory;
  }

  public void foo() {
    Bar bar = this.barFactory.createBar();
    bar.someMethod();
  }
}

在您的测试方法中，您可以注入这样的BarFactory ：

in your test method you can inject a BarFactory like this:

@Test
public void testDoFoo() {
  Bar bar = mock(Bar.class);
  BarFactory myFactory = new BarFactory() {
    public Bar createBar() { return bar;}
  };

  Foo foo = new Foo(myFactory);
  foo.foo();

  verify(bar, times(1)).someMethod();
}

奖励：这是TDD如何推动代码设计的示例。

Bonus: This is an example of how TDD can drive the design of your code.

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