AssumptionTest.java

// Copyright (c) 2005 Dustin Sallings <dustin@spy.net>

package net.spy;

import junit.framework.TestCase;

/**
 * Test some various assumptions about java.
 */
public class AssumptionTest extends TestCase {

	public void testStringBuilderDeleteChar() {
		StringBuilder sb=new StringBuilder("blah.");
		sb.deleteCharAt(sb.length()-1);
		assertEquals("blah", sb.toString());
	}

	public void testStringBuilderDelete() {
		StringBuilder sb=new StringBuilder("blah..");
		sb.delete(sb.length()-2, sb.length());
		assertEquals("blah", sb.toString());
	}

	public void testThreadInterruption() throws Exception {
		TestThread tt=new TestThread();
		tt.start();
		Thread.yield();
		assertFalse(tt.wasInterrupted);
		tt.interrupt();
		Thread.sleep(100);
		assertTrue(tt.wasInterrupted);
		// Throwing interrupted exceptions clears the interrupted state
		assertFalse(tt.isInterrupted());
	}

	static class TestThread extends Thread {
		public volatile boolean wasInterrupted=false;
		@Override
		public void run() {
			try {
				sleep(10000);
			} catch(InterruptedException e) {
				wasInterrupted=true;
			}
		}
	}
}