java - Android kotlin 单元测试用例..?
问题描述
如何为以下函数编写测试用例。
public void trackMaxInterval(int trackingFastestInterval) {
if (trackingFastestInterval != 0) {
preferencesManager.writeLong(Constants.INTERVAL, interval);
} else {
preferencesManager.writeLong(Constants.INTERVAL, Service.INTERVAL);
}
}
我尝试了下面的代码,但得到一个空点异常,它说 PreferencesManager 为空
@Test
fun shouldSaveTracking_MaxIntervalValue() {
val preManager: PreferencesManager = mock(PreferencesManager::class.java)
loginPresenter.trackMaxInterval(2)
verify(preManager, times(1)).writeLong(Constants.INTERVAL, 2)
}
附上错误日志。
java.lang.NullPointerException
at com.track.ui.login.LoginPresenter.trackMaxInterval(LoginPresenter.java:1055)
at com.track.ui.LoginPresenterTest.shouldSaveTracking_MaxIntervalValue(LoginPresenterTest.kt:142)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.mockito.internal.runners.DefaultInternalRunner$1.run(DefaultInternalRunner.java:79)
at org.mockito.internal.runners.DefaultInternalRunner.run(DefaultInternalRunner.java:85)
at org.mockito.internal.runners.StrictRunner.run(StrictRunner.java:39)
at org.mockito.junit.MockitoJUnitRunner.run(MockitoJUnitRunner.java:163)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:230)
at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:58)
解决方案
看起来您的loginPresenter
对象不包含对 PreferencesManager 实例的引用。即使您在测试中模拟您的 PreferenceMananger,您也必须以某种方式将其传递给loginPresenter
对象。
推荐阅读
- group-by - 发票表中枢轴的最大计数
- r - 在 r 中的许多列上应用一个函数
- c++ - 为什么创建 std::move 而不是使用 static_cast
- python - 删除特征后重新计算特征重要性
- c# - 理解 C# 方法中的隐式转换
- javascript - 本地存储不存储值。仅存储 [object MouseEvent]
- github - 我如何在 GitHub 中请求组织批准 OAuth 应用程序,真的吗?
- sql-server - JPA - 仅当当前为空时才允许更新列
- html - CSS 背景滤镜模糊在 Windows 上没有正确模糊边缘(适用于 macOS)
- arrays - 如何将 GitLab CI 变量设置为 gitlab-ci 中的数组?