尝试使用IntelliJ IDEA学习JUnit 5.创建了一个测试类并尝试测试一个方法.这是消息(见第三行)：

INFO: Discovered TestEngines with IDs: [junit-jupiter]
Internal Error occurred.
org.junit.platform.commons.util.PreconditionViolationException:'DirectoryTest#directory2bytes' could not be resolved to a unique method
at org.junit.platform.engine.discovery.DiscoverySelectors.lambda$selectMethod$1(DiscoverySelectors.java:131)
at java.util.Optional.orElseThrow(Optional.java:290)
at org.junit.platform.engine.discovery.DiscoverySelectors.selectMethod(DiscoverySelectors.java:130)
at com.intellij.junit5.JUnit5TestRunnerUtil.createSelector(JUnit5TestRunnerUtil.java:111)
at com.intellij.junit5.JUnit5TestRunnerUtil.buildRequest(JUnit5TestRunnerUtil.java:86)
at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:46)
at com.intellij.rt.execution.junit.IdeaTestRunner$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)

Process finished with exit code 254
Empty test suite.

我无法理解为什么这个方法无法解决：它编译并且肯定存在：

@Test
void directory2bytes( ) {
    testBytes = testDir.directory2bytes();
    for( int i = 0; i <= 10; i++) {
        System.out.print( testBytes[i] + " ")
    }
    System.out.println( );
}

我已经定义了这个：

@BeforeEach
void setUp( ) {
    testDir = new Directory( )
    testBytes = new byte[1000];
}

更新：退出并重新启动IntelliJ IDEA,我现在收到无法解析导入符号“junit”的消息,以及各种注释“@beforeEach”,“afterEach”和“Test”.

更新2：找到并修复了测试类中缺少的分号,但没有更改.注意：我正在测试的某些类中存在编译错误,但我将测试运行配置设置为“构建,无错误检查”.这是正确的吗？我也尝试使用JUnit 4创建相同的测试(使用不同的类名),但这也不起作用.

以下是几行错误消息：

Dec 07, 2016 9:51:41 AM org.junit.platform.launcher.core.ServiceLoaderTestEngineRegistry loadTestEngines
INFO: Discovered TestEngines with IDs: [junit-jupiter, junit-vintage]
Internal Error occurred.
org.junit.platform.commons.util.PreconditionViolationException: Could not load class with name: DirectoryTest
at org.junit.platform.engine.discovery.MethodSelector.lambda$lazyLoadJavaClass$0(MethodSelector.java:154)

解决方法:

由于bug,M2不支持选择带参数的方法.这在M3中得到修复.但是,要在IntelliJ IDEA中使用M3开箱即用,您需要2016.3.1,它将在下周发布.有一个workaround使用M3与当前版本的IntelliJ IDEA.