android - 当方法抛出异常甚至尝试捕获时,JUnit 测试失败
问题描述
我应该怎么做才能验证以下情况?
笔记
我有尝试@Test(expected = NumberFormatException.class)
但没有希望。此外,看起来有些人删除了 try/catch 块并在方法签名处标记它(如果我们知道为什么不处理它)
测试代码
public class CalculatorViewModel extends BaseObservable {
Calculator calculator;
String inputCheckAmount;
String inputTipPercentage;
TipCalculator tipCalculation;
public CalculatorViewModel(Calculator calculator) {
this.calculator = calculator;
this.tipCalculation = new TipCalculator("", 0, 0,0, 0);
if (calculator == null) {
this.calculator = new Calculator();
}
}
public void calculateTip() {
try {
double checkAmount = Double.parseDouble(inputCheckAmount);
int tipPercentage = Integer.parseInt(inputTipPercentage);
tipCalculation = calculator.calculatorTip(checkAmount, tipPercentage);
} catch (NumberFormatException nfe) {
nfe.printStackTrace();
}
}
}
在测试课..
public class CalculatorViewModelTest {
CalculatorViewModel viewModel;
@Mock
Calculator mockCalculator;
@Before
public void setUp() throws Exception {
MockitoAnnotations.initMocks(this);
viewModel = new CalculatorViewModel(mockCalculator);
}
@Test
public void testCalculateTipBadTipPercentage() {
// Arrange
viewModel.inputCheckAmount = "10.00";
viewModel.inputTipPercentage = "";
// Act
viewModel.calculateTip();
// Asset
verify(mockCalculator, never()).calculatorTip(anyDouble(), anyInt());
}
}
错误日志
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:592)
at java.lang.Integer.parseInt(Integer.java:615)
at com.viinsoft.playground.mvvmmytipcalculator.viewmodel.CalculatorViewModel.calculateTip(CalculatorViewModel.java:26)
at com.viinsoft.playground.mvvmmytipcalculator.viewmodel.CalculatorViewModelTest.testCalculateTipBadTipPercentage(CalculatorViewModelTest.java:56)
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:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:19)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
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 com.intellij.rt.execution.application.AppMainV2.main(AppMainV2.java:131)
java.lang.AssertionError: Expected exception: java.lang.NumberFormatException
解决方案
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