public void testCloseProjects() throws JavaModelException {

	// store current settings

	long oldSnapInterval = ENV.getWorkspace().getDescription().getSnapshotInterval();

	boolean oldAutoBuildPolicy = ENV.isAutoBuilding();

	// prevent snapshots and autobuilds from disturbing our measures

	ENV.getWorkspace().getDescription().setSnapshotInterval(100000);

	ENV.getWorkspace().getDescription().setAutoBuilding(false);

	try {

		int length=ALL_PROJECTS.length;

		// Warm-up

		for (int i=0; i<WARMUP_COUNT; i++) {

			for (int j=0; j<length; j++) {

				ENV.closeProject(ALL_PROJECTS[j].getPath());

			}

			for (int j=0; j<length; j++) {

				ENV.openProject(ALL_PROJECTS[j].getPath());

			}

		}

		// Measures

		for (int i=0; i<MEASURES_COUNT; i++) {

			AbstractJavaModelTests.waitUntilIndexesReady();

			// should not be autobuilding...

			if (ENV.isAutoBuilding()) {

				ENV.waitForAutoBuild();

			}

			runGc();

			startMeasuring();

			for (int j=0; j<length; j++) {

				ENV.closeProject(ALL_PROJECTS[j].getPath());

			}

			stopMeasuring();

			for (int j=0; j<length; j++) {

				ENV.openProject(ALL_PROJECTS[j].getPath());

			}

		}

		// Commit

		commitMeasurements();

		assertPerformance();

	}

	finally {

		// restore previous settings

		ENV.getWorkspace().getDescription().setSnapshotInterval(oldSnapInterval);

		ENV.getWorkspace().getDescription().setAutoBuilding(oldAutoBuildPolicy);

	}

}