Max heap enforcer. Makes sure your unit tests heap size, on the PC, is not larger than the heap size of the Android device your developing for (24m-64m). Otherwise your code will rock on the PC, but get an OOME on the device.

MobileLikeSmallHeapDuringTestsEnforce

import static org.junit.Assert.assertTrue;
import org.junit.Test;

public class MobileLikeSmallHeapDuringTestsEnforce {
	public static final long MB = 1024 * 1024;
	public static final long ANDROID_TYPICAL_MAX_HEAP_MB = 24;
	public static final String XMX_ARGUMENT = "-Xmx" + ANDROID_TYPICAL_MAX_HEAP_MB + "m";

	@Test
	public void assertHeapIsMobileLikeSmall() {
		long maxMemory = Runtime.getRuntime().maxMemory();
		assertTrue("Max heap is too high for mobile!\n" +
				"This JUnit test JVM heap max memory (" + maxMemory / MB + "MB) "
				+ "is higher than the max heap size on a typical Android device (" + ANDROID_TYPICAL_MAX_HEAP_MB + "MB).\n" +
				"Lowering max heap size will allow you to catch code flows that use too much memory.\n" +
				"To correct: Add " + XMX_ARGUMENT + " as a VM argument.\n" +
				"Correct in eclipse: menu > Run > Run Configuration... > Arguments tab > VM arguments > " + XMX_ARGUMENT,
				maxMemory <= ANDROID_TYPICAL_MAX_HEAP_MB * MB);
	}
}