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TestFlowRunner throws SWTException: Invalid thread access #9

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@miguelalba

Hi!

I am sorry if this issue has already been reported. I looked in the closed issues and could not find it. I am following the example from the readme.

	@Rule
	public ErrorCollector collector = new ErrorCollector();

	private static TestFlowRunner runner;

	@Before
	public void setUp() {
		TestrunConfiguration runConfiguration = new TestrunConfiguration();
		runConfiguration.setLoadSaveLoad(false);
		runner = new TestFlowRunner(collector, runConfiguration);
	}

In my test method I have

runner.runTestWorkflow(new File("workflows/InitializeParentsAnimals"));

This is a simple workflow with only three nodes but the TestFlowRunner does not execute, it fails at the beginning of the runTestWorkflow method:

The full trace is:

-------------------------------------------------------------------------------
Test set: de.bund.bfr.knime.fsklab.workflows.tests.WorkflowsTest
-------------------------------------------------------------------------------
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 2.603 sec <<< FAILURE! - in de.bund.bfr.knime.fsklab.workflows.tests.WorkflowsTest
testChickenModels(de.bund.bfr.knime.fsklab.workflows.tests.WorkflowsTest)  Time elapsed: 2.514 sec  <<< ERROR!
org.eclipse.swt.SWTException: Invalid thread access
	at org.eclipse.swt.SWT.error(SWT.java:4533)
	at org.eclipse.swt.SWT.error(SWT.java:4448)
	at org.eclipse.swt.SWT.error(SWT.java:4419)
	at org.eclipse.swt.widgets.Display.error(Display.java:1090)
	at org.eclipse.swt.widgets.Display.createDisplay(Display.java:840)
	at org.eclipse.swt.widgets.Display.create(Display.java:823)
	at org.eclipse.swt.graphics.Device.<init>(Device.java:129)
	at org.eclipse.swt.widgets.Display.<init>(Display.java:722)
	at org.eclipse.swt.widgets.Display.<init>(Display.java:713)
	at org.eclipse.swt.widgets.Display.getDefault(Display.java:1420)
	at org.knime.workbench.core.KNIMECorePlugin.createImageRegistry(KNIMECorePlugin.java:501)
	at org.eclipse.ui.plugin.AbstractUIPlugin.getImageRegistry(AbstractUIPlugin.java:250)
	at org.knime.workbench.core.util.ImageRepository.getImage(ImageRepository.java:410)
	at org.knime.workbench.core.util.ImageRepository.getImage(ImageRepository.java:376)
	at nl.esciencecenter.e3dchem.knime.testing.TestFlowRunner.runTestWorkflow(TestFlowRunner.java:80)
	at de.bund.bfr.knime.fsklab.workflows.tests.WorkflowsTest.testChickenModels(WorkflowsTest.java:53)```

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