Fix random failing IProjectTest.*OutOfSync eclipse-platform#422

The *OutOfSync tests in IProjectTest create files in the file system and
assume them to be unsynchronized with the workspace. A concurrent
execution of the background refresh job can, however, lead to a
synchronized state of the resources in the workspace.
With this change, a potentially pending refresh is processed before
creating the file in the file system, such that its state may not
concurrently change.

resources/tests/org.eclipse.core.tests.resources/src/org/eclipse/core/tests/resources/IProjectTest.java

@@ -1372,6 +1372,7 @@ public void testProjectDeletionClosedUserDefinedOutOfSync() throws CoreException
 		description.setLocationURI(projectStore.toURI());
 		ensureExistsInWorkspace(project, description);
 		ensureExistsInWorkspace(file, true);
+		waitForRefresh();
 		ensureExistsInFileSystem(otherFile);
 		fileStore = ((Resource) file).getStore();
 		otherFileStore = ((Resource) otherFile).getStore();
@@ -1623,6 +1624,7 @@ public void testProjectDeletionOpenDefaultOutOfSync() throws CoreException {
 		 * Delete content = DEFAULT
 		 * =======================================================================*/
 		ensureExistsInWorkspace(project, true);
+		waitForRefresh();
 		ensureExistsInFileSystem(file);
 		projectStore = ((Resource) project).getStore();
 		fileStore = ((Resource) file).getStore();
@@ -1923,6 +1925,7 @@ public void testProjectDeletionOpenUserDefinedOutOfSync() throws CoreException {
 		description.setLocationURI(projectStore.toURI());
 		ensureExistsInWorkspace(project, description);
 		ensureExistsInWorkspace(file, true);
+		waitForRefresh();
 		ensureExistsInFileSystem(otherFile);
 		fileStore = ((Resource) file).getStore();
 		otherFileStore = ((Resource) otherFile).getStore();