Wait for auto-build in JavaModelTests.testGetNonJavaResources

Logging of received deltas shows AutoBuildJob.AutoBuildOffJob
usually sending the deltas necessary for the test to pass.
In the case of testGetNonJavaResources failing, AutoBuildOffJob
ran slightly earlier and did not notify about changes for test project SP2.

This change adds waiting on auto-build, which will also join
the AutoBuildOffJob. This hopefully ensures delta notifications
are received before doing assertions in the test.

See: #2716

Author: trancexpress

org.eclipse.jdt.core.tests.model/src/org/eclipse/jdt/core/tests/model/JavaModelTests.java

@@ -486,30 +486,34 @@ public void testGetJavaProjects2() throws CoreException {
 /*
  * Test retrieving non-Java projects.
  */
-public void testGetNonJavaResources() throws CoreException {
+public void testGetNonJavaResources() throws Exception {
 	try {
 		IJavaModel model = getJavaModel();
 
 		this.createJavaProject("JP", new String[]{}, "");
+		waitForAutoBuild();
 		assertResourceNamesEqual(
 			"Unexpected non-Java resources",
 			"",
 			model.getNonJavaResources());
 
 		createProject("SP1");
+		waitForAutoBuild();
 		assertResourceNamesEqual(
 			"Unexpected non-Java resources after creation of SP1",
 			"SP1",
 			model.getNonJavaResources());
 
 		createProject("SP2");
+		waitForAutoBuild();
 		assertResourceNamesEqual(
 			"Unexpected non-Java resources after creation of SP2",
 			"SP1\n" +
 			"SP2",
 			model.getNonJavaResources());
 
 		this.deleteProject("SP1");
+		waitForAutoBuild();
 		assertResourceNamesEqual(
 			"Unexpected non-Java resources after deletion of SP1",
 			"SP2",