Can someone explain me why my JUnit test fail:
Unexpected exception, expected<java.lang.NullPointerException> but was<java.lang.IllegalArgumentException>
package com;
import java.util.Objects;
import javax.annotation.Nonnull;
import javax.validation.constraints.NotNull;
import org.junit.Test;
public class AnnotationTest {
private void nonnullMethod(@Nonnull String arg) {
Objects.requireNonNull(arg);
}
@Test(expected = NullPointerException.class)
public void nonnullMethodTest() {
nonnullMethod(null);
}
private void notNullMethod(@NotNull String arg) {
Objects.requireNonNull(arg);
}
@Test(expected = NullPointerException.class)
public void notNullMethodTest() {
notNullMethod(null);
}
}
Here the StackTrace:
java.lang.Exception: Unexpected exception, expected<java.lang.NullPointerException> but was<java.lang.IllegalArgumentException>
at org.junit.internal.runners.statements.ExpectException.evaluate(ExpectException.java:28)
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:51)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:237)
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.AppMain.main(AppMain.java:147)
Caused by: java.lang.IllegalArgumentException: Argument for @Nonnull parameter 'arg' of com/AnnotationTest.nonnullMethod must not be null
at com.AnnotationTest.$$$reportNull$$$0(AnnotationTest.java)
at com.AnnotationTest.nonnullMethod(AnnotationTest.java)
at com.AnnotationTest.nonnullMethodTest(AnnotationTest.java:17)
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)
... 19 more
Thanks
IntelliJ has recently started generating this assertion code by default. If you don't want this behavior, you can deactivate it in the compiler settings:
The configuration behind the "configure annotations" button allows you to specify which annotations should be taken into account. This is why it behaves differently when you switch annotations.
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