Trying to mock new Object in test with gradle and testng groups

[Mathieu Denis]

Hi,

I am using gradle to build my application and I need to run only one group when I build. To do this, there is the following statements in build.gradle :

test {
    useTestNG() {
        includeGroups 'unit'
    }
}

Also, for one of the tests, I need to mock the creation of an object, so I used Powermock for that. If there is no constraint on the group (if I comment out the "includeGroups 'unit' "), it works fine, but when I do try with the 'unit' group, I get the following stack trace :

java.lang.ExceptionInInitializerError
    at org.mockito.internal.exceptions.stacktrace.StackTraceFilter.<clinit>(StackTraceFilter.java:21)
    at org.mockito.internal.debugging.LocationImpl.<init>(LocationImpl.java:19)
    at org.mockito.internal.matchers.LocalizedMatcher.<init>(LocalizedMatcher.java:24)
    at org.mockito.internal.progress.ArgumentMatcherStorageImpl.reportMatcher(ArgumentMatcherStorageImpl.java:32)
    at org.mockito.Matchers.reportMatcher(Matchers.java:878)
    at org.mockito.Matchers.any(Matchers.java:291)
    at org.powermock.api.mockito.internal.expectation.DefaultConstructorExpectationSetup.withAnyArguments(DefaultConstructorExpectationSetup.java:69)
    at ClassTestedTest.myTest(ClassTestedTest.java:22)
    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:497)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:86)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:645)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:822)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1130)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)
    at org.testng.TestRunner.privateRun(TestRunner.java:782)
    at org.testng.TestRunner.run(TestRunner.java:632)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:366)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:361)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:319)
    at org.testng.SuiteRunner.run(SuiteRunner.java:268)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1244)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1169)
    at org.testng.TestNG.run(TestNG.java:1064)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:113)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:206)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:177)
Caused by: java.lang.NullPointerException
    at org.mockito.internal.exceptions.stacktrace.StackTraceFilter.filter(StackTraceFilter.java:36)
    at org.mockito.internal.exceptions.stacktrace.ConditionalStackTraceFilter.filter(ConditionalStackTraceFilter.java:23)
    at org.mockito.exceptions.base.MockitoException.filterStackTrace(MockitoException.java:42)
    at org.mockito.exceptions.base.MockitoException.<init>(MockitoException.java:30)
    at org.mockito.exceptions.misusing.MockitoConfigurationException.<init>(MockitoConfigurationException.java:18)
    at org.mockito.internal.configuration.plugins.PluginLoader.loadImpl(PluginLoader.java:66)
    at org.mockito.internal.configuration.plugins.PluginLoader.loadPlugin(PluginLoader.java:24)
    at org.mockito.internal.configuration.plugins.PluginRegistry.<init>(PluginRegistry.java:12)
    at org.mockito.internal.configuration.plugins.Plugins.<clinit>(Plugins.java:11)
    ... 32 more

The class I want to test is the following :

public class ClassTested {
  public boolean doSomething() throws Exception {
    ClassInstantiated obj = new ClassInstantiated("someRandomString");
    try {
      obj.process();
    } catch (Exception e) {
      return false;
    }
    return true;
  }
}

My testClass :

@PrepareForTest(ClassTested.class)
@Test(groups = "unit")
public class ClassTestedTest extends PowerMockTestCase {
  @InjectMocks
  private ClassTested classUnderTest;

  @Mock
  private ClassInstantiated mockNewInstance;

  @Test
  public void myTest() throws Exception {
    PowerMockito.whenNew(ClassInstantiated.class).withAnyArguments().thenReturn(mockNewInstance);
    doThrow(new Exception()).when(mockNewInstance).process();

    boolean valueReturned = classUnderTest.doSomething();

    Assert.assertFalse(valueReturned);
  }
}

I use Java 8, gradle 2.4 along as the following dependencies :

    testCompile("org.testng:testng:6.9.6")
    testCompile('org.powermock:powermock-api-mockito:1.6.4')
    testCompile('org.powermock:powermock-module-testng:1.6.4')

[Mathieu Denis]

I have tried from Eclipse and this seems to be related to TestNG group and not a specific issue from gradle TestNG plugin.

From Eclipse, if I run only the TestNG group "unit", it shows the same exception as the one that I get when I build with gradle. It looks like Powermock doesn't support correctly the group feature of testNG.