android - 如何对方法进行单元测试，当它在 android 中有处理程序时

Question

我有这样的方法

  public void updateListViewVisibility(List<User> userList) {
      userViewVisibility.set(View.GONE);
      handler.postDelayed(runnableCode, 10000000);
   }


/**
 * A runnable code, the purpose of this is to display a message if no user found in range.
 */
private Runnable runnableCode = new Runnable() {
    @Override
    public void run() {
        changeState();
    }
};

如果 updateListViewVisibility 方法中没有处理程序，我可以运行此单元测试

@Test
public void test_updateupdateListViewVisibility() {
    List<User> userList = new ArrayList<User>();
    userList.clear();
    SUT.updateListViewVisibility(userList);
    assertEquals("Variable userViewVisibility should be false",
            SUT.userViewVisibility.get(), false);
}

但是，如果我保留处理程序

我收到以下错误。

java.lang.RuntimeException: Method postDelayed in android.os.Handler not mocked. See http://g.co/androidstudio/not-mocked for details.

如何正确地对该方法进行单元测试？

Answer 1

很简单，运行你的测试类 MockitoJunitRunner

例如:@RunWith(MockitoJUnitRunner.class)
公共(public)类 WhateverClassTest { }

并模拟处理程序

@Mock
Handler handler

//添加这些依赖到 gradle:

    testImplementation 'org.mockito:mockito-core:2.2.0'
    testImplementation 'junit:junit:4.12'