Can not run TestSuite when SWT Classes are involved

From mirco.fr…@gmail.com on August 07, 2014 09:36:42

I have some test for features in an Eclipse RCP project. No SWT Components are involved directly, but some files needed for the test import SWT components. (e.g. org.eclipse.swt.graphics.Image).

When the test are run stand-alone, everything is fine. But as soon as they are put into a TestSuite, all tests fail with the following error:

java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons: no swt-win32-3836 in java.library.path no swt-win32 in java.library.path Native Library C:\Users\franzm.swt\lib\win32\x86_64\swt-win32-3836.dll already loaded in another classloader Can’t load library: C:\Users\franzm.swt\lib\win32\x86_64\swt-win32.dll

at org.eclipse.swt.internal.Library.loadLibrary(Library.java:331)
at org.eclipse.swt.internal.Library.loadLibrary(Library.java:240)
at org.eclipse.swt.internal.C.<clinit>(C.java:21)
at org.eclipse.swt.widgets.Widget.<clinit>(Widget.java:103)
at com.example.app.client.ui.filters.FilterDtoUtil.formatDateFormat(FilterDtoUtil.java:325)
at com.example.app.client.ui.filters.FilterDtoUtil.getMarketVariantsProductionSitesWithDates(FilterDtoUtil.java:358)
at com.example.app.client.ui.filters.factories.FilterContributor.getFilterRow(FilterContributor.java:566)
at com.example.app.client.ui.filters.factories.AbstractBigFilterFactory.getFilterRow(AbstractBigFilterFactory.java:59)
at com.example.app.client.ui.excelexport.AbstractExcelTest.before(AbstractExcelTest.java:73)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.internal.runners.MethodRoadie.runBefores(MethodRoadie.java:132)
at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:95)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.executeTest(PowerMockJUnit44RunnerDelegateImpl.java:294)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTestInSuper(PowerMockJUnit47RunnerDelegateImpl.java:127)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit47RunnerDelegateImpl$PowerMockJUnit47MethodRunner.executeTest(PowerMockJUnit47RunnerDelegateImpl.java:82)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$PowerMockJUnit44MethodRunner.runBeforesThenTestThenAfters(PowerMockJUnit44RunnerDelegateImpl.java:282)
at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:86)
at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:49)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.invokeTestMethod(PowerMockJUnit44RunnerDelegateImpl.java:207)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.runMethods(PowerMockJUnit44RunnerDelegateImpl.java:146)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl$1.run(PowerMockJUnit44RunnerDelegateImpl.java:120)
at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:33)
at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:45)
at org.powermock.modules.junit4.internal.impl.PowerMockJUnit44RunnerDelegateImpl.run(PowerMockJUnit44RunnerDelegateImpl.java:118)
at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:104)
at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53)
at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:53)
at org.junit.runners.Suite.runChild(Suite.java:127)
at org.junit.runners.Suite.runChild(Suite.java:26)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

From my point of view, PowerMockito tries to load the DLL for every tests and blocks itself there.

_Original issue: http://code.google.com/p/powermock/issues/detail?id=511_

[hgschwibbe]

The suppress static initializer hint saved my day. Here is an example how I solved it with PowerMockito:

@RunWith(PowerMockRunner.class)
@SuppressStaticInitializationFor({
        "org.eclipse.swt.widgets.Display"
})
@PrepareForTest({
        Display.class
})
public abstract class MockDisplayTest {

    @Before
    public void before() throws Exception {
        PowerMockito.suppress(org.eclipse.swt.widgets.Display.class.getConstructors());
        PowerMockito.mockStatic(org.eclipse.swt.widgets.Display.class);
        Display display = Mockito.mock(Display.class);
        PowerMockito.doAnswer(invocation -> {
            Runnable runnable = invocation.getArgumentAt(0, Runnable.class);
            runnable.run();
            return null;
        }).when(display).asyncExec(Mockito.any());
        PowerMockito.doAnswer(invocation -> {
            Runnable runnable = invocation.getArgumentAt(0, Runnable.class);
            runnable.run();
            return null;
        }).when(display).syncExec(Mockito.any());
        PowerMockito.when(org.eclipse.swt.widgets.Display.getDefault()).thenReturn(display);
        PowerMockito.when(org.eclipse.swt.widgets.Display.getCurrent()).thenReturn(display);
    }
}

[johanhaleby]

From johan.ha…@gmail.com on August 28, 2014 04:30:42

You need to suppress the static initializer that loads the DLL.

Status: Invalid