如何使用 Mockito 测试 Presenter 中的 void 方法?
How to test a void method within a Presenter using Mockito?
我有一个使用 MVP 模式构建的非常简单的应用程序。这是我的合同:
public interface CitiesContract {
interface View {
void addCitiesToList(List<City> cityList);
}
interface Presenter {
void getCityList();
}
interface Model {
List<City> getCityList();
}
}
这是我的观点:
public class CitiesActivity extends AppCompatActivity implements CitiesContract.View {
private List<City> cityList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cities);
CitiesPresenter presenter = new CitiesPresenter(this);
presenter.getCityList();
}
@Override
public void addCitiesToList(List<City> cities) {
cityList.addAll(cities);
}
}
这是我的主持人:
public class CitiesPresenter implements CitiesContract.Presenter {
private CitiesContract.View view;
private CitiesModel model;
public CitiesPresenter(CitiesContract.View view) {
this.view = view;
model = new CitiesModel();
}
@Override
public void getCityList() {
List<City> cityList = model.getCityList();
view.addCitiesToList(cityList);
}
}
这是我的模特:
public class CitiesModel implements CitiesContract.Model {
@Override
public List<City> getCityList() {
List<City> cityList = new ArrayList<>();
//Add 30 cities to the list
return cityList;
}
}
如何在 Presenter 中测试 getCityList()
方法?这是我到目前为止尝试过的:
public class CitiesPresenterTest {
private CitiesContract.Presenter citiesPresenter;
@Mock
private CitiesContract.View citiesView;
public void setUp() {
MockitoAnnotations.initMocks(this);
citiesPresenter = new CitiesPresenter(citiesView);
}
@Test
public void getCityListTest() {
citiesPresenter.getCityList();
//What to do next???
}
}
好的,顺便说一句,这是个好问题。首先,您还需要模拟您的模型。
第二:安排一些东西:例如model.getCityList()
return null。
之后,您可以使用 mockitos verify
运算符进行验证。示例:
when(model.getCityList()).thenReturn(null);
citiesPresenter.getCityList();
verify(view).addCitiesToList(null);
另一种情况可能与此类似,但列表为空:
List<City> citiesList = new ArrayList<>();
when(model.getCityList()).thenReturn(citiesList );
citiesPresenter.getCityList();
verify(view).addCitiesToList(citiesList);
另一个也可以这样,你可以自己构建一个假列表来测试它:
List<City> citiesList = new ArrayList<>();
list.add(City("name", "something else", "i don't know what atributes you have"));
when(model.getCityList()).thenReturn(citiesList );
citiesPresenter.getCityList();
verify(view).addCitiesToList(citiesList);
希望我帮到了你。
附加信息:当进行单元测试时,您的头脑中应该有 3 个基本步骤:首先,您安排:因此您创建自己的 scenario.Example 如果列表为空会怎样。
第二:你行动:这一步是你测试你想要的方法的地方。
第三:断言:这是您验证或断言您的期望与给定代码匹配的地方。
我有一个使用 MVP 模式构建的非常简单的应用程序。这是我的合同:
public interface CitiesContract {
interface View {
void addCitiesToList(List<City> cityList);
}
interface Presenter {
void getCityList();
}
interface Model {
List<City> getCityList();
}
}
这是我的观点:
public class CitiesActivity extends AppCompatActivity implements CitiesContract.View {
private List<City> cityList = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cities);
CitiesPresenter presenter = new CitiesPresenter(this);
presenter.getCityList();
}
@Override
public void addCitiesToList(List<City> cities) {
cityList.addAll(cities);
}
}
这是我的主持人:
public class CitiesPresenter implements CitiesContract.Presenter {
private CitiesContract.View view;
private CitiesModel model;
public CitiesPresenter(CitiesContract.View view) {
this.view = view;
model = new CitiesModel();
}
@Override
public void getCityList() {
List<City> cityList = model.getCityList();
view.addCitiesToList(cityList);
}
}
这是我的模特:
public class CitiesModel implements CitiesContract.Model {
@Override
public List<City> getCityList() {
List<City> cityList = new ArrayList<>();
//Add 30 cities to the list
return cityList;
}
}
如何在 Presenter 中测试 getCityList()
方法?这是我到目前为止尝试过的:
public class CitiesPresenterTest {
private CitiesContract.Presenter citiesPresenter;
@Mock
private CitiesContract.View citiesView;
public void setUp() {
MockitoAnnotations.initMocks(this);
citiesPresenter = new CitiesPresenter(citiesView);
}
@Test
public void getCityListTest() {
citiesPresenter.getCityList();
//What to do next???
}
}
好的,顺便说一句,这是个好问题。首先,您还需要模拟您的模型。
第二:安排一些东西:例如model.getCityList()
return null。
之后,您可以使用 mockitos verify
运算符进行验证。示例:
when(model.getCityList()).thenReturn(null);
citiesPresenter.getCityList();
verify(view).addCitiesToList(null);
另一种情况可能与此类似,但列表为空:
List<City> citiesList = new ArrayList<>();
when(model.getCityList()).thenReturn(citiesList );
citiesPresenter.getCityList();
verify(view).addCitiesToList(citiesList);
另一个也可以这样,你可以自己构建一个假列表来测试它:
List<City> citiesList = new ArrayList<>();
list.add(City("name", "something else", "i don't know what atributes you have"));
when(model.getCityList()).thenReturn(citiesList );
citiesPresenter.getCityList();
verify(view).addCitiesToList(citiesList);
希望我帮到了你。
附加信息:当进行单元测试时,您的头脑中应该有 3 个基本步骤:首先,您安排:因此您创建自己的 scenario.Example 如果列表为空会怎样。 第二:你行动:这一步是你测试你想要的方法的地方。 第三:断言:这是您验证或断言您的期望与给定代码匹配的地方。