java - 使用 `when` 应该返回不同的值

Question

我正在编写一个单元测试，其中我正在模拟我想要测试的类中的 init 函数。

我有两个使用相同配置值的上下文变量，但是如何以两个上下文变量具有不同上下文值的方式进行模拟。到目前为止，它们都有相同的上下文。

class StandardRendererUtility @Inject constructor(app: App, private val rendererLocale: String) {

private val rendererLocaleContext: Context //has rendererLocaleContext
private val defaultLocaleContext: Context //has rendererLocaleContext

init {
    val configuration = Configuration(app.getApplicationContext().getResources().getConfiguration())
    configuration.setLocale(Locale(rendererLocale))
    rendererLocaleContext = app.getApplicationContext().createConfigurationContext(configuration)
    configuration.setLocale(Locale(DEFAULT_LOCALE))
    defaultLocaleContext = app.getApplicationContext().createConfigurationContext(configuration)
}

}

我的测试功能

@RunWith(MockitoJUnitRunner::class)
class StandardRendererUtilityTest {
    private lateinit var standardRendererUtility: StandardRendererUtility

    @Mock
    private lateinit var app: App
    @Mock
    private lateinit var context: Context
    @Mock
    private lateinit var configuration: Configuration
    @Mock
    private lateinit var rendererLocaleContext: Context
    @Mock
    private lateinit var defaultLocaleContext: Context
    @Mock
    private lateinit var resources: Resources
    @Mock
    private lateinit var rendererLocaleResources: Resources
    @Mock
    private lateinit var defaultLocaleResources: Resources


@Before
fun setup(){
    MockitoAnnotations.initMocks(this)
    `when`(app.getApplicationContext()).thenReturn(context)
    `when`(context.getResources()).thenReturn(resources)
    `when`(resources.getConfiguration()).thenReturn(configuration)
    `when`(context.createConfigurationContext(ArgumentMatchers.any())).thenReturn(rendererLocaleContext)
//AT THIS POINT I THINK SHOULD BE CORRECTED. HOW CAN I RETURN defaultLocaleContext AS WELL
    standardRendererUtility = StandardRendererUtility(app, "fr")

}

}

Answer 1

根据API您有两个选择:

1. 链接 thenReturn() 方法调用(我更喜欢这样的可读性):

   when(context.createConfigurationContext(ArgumentMatchers.any()))
         .thenReturn(rendererLocaleContext)
         .thenReturn(defaultLocaleContext);
   

2. 提供要作为 varags 返回的对象给 thenReturn()

   when(context.createConfigurationContext(ArgumentMatchers.any()))
         .thenReturn(rendererLocaleContext, defaultLocaleContext);