GameOfLifeTest.java

package gameoflife2;import java.io.ByteArrayOutputStream;import java.io.PrintStream;import java.lang.reflect.Field;import java.lang.reflect.Modifier;import junit.framework.TestCase;public class GameOfLifeTest extends TestCase {	private void testWillLive(boolean isLive, int neighbourCount, boolean expected) {		assertEquals(expected, GameOfLife.willLive(isLive, neighbourCount));	}	public void testWillLive() {		testWillLive(false, 0, false);		testWillLive(false, 1, false);		testWillLive(false, 2, false);		testWillLive(false, 3, true);		testWillLive(false, 4, false);		testWillLive(false, 5, false);		testWillLive(false, 6, false);		testWillLive(false, 7, false);		testWillLive(false, 8, false);		testWillLive(true, 0, false);		testWillLive(true, 1, false);		testWillLive(true, 2, true);		testWillLive(true, 3, true);		testWillLive(true, 4, false);		testWillLive(true, 5, false);		testWillLive(true, 6, false);		testWillLive(true, 7, false);		testWillLive(true, 8, false);	}	static void setColony(Colony colony, int y, int x, int w, int h, int values) {		for (int dy = 0; dy < h; dy++) {			for (int dx = 0; dx < w; dx++) {				colony.setCell(y + dy, x + dx, (values & 1) == 1);				values >>= 1;			}		}	}	public void testStepColony() {		Colony colony = new Colony(3, 3), nextColony = new Colony(3, 3);		for (int i = 0; i < (1 << 9); i++) {			setColony(colony, 1, 1, 3, 3, i);			setColony(nextColony, 1, 1, 3, 3, i);			int changes = GameOfLife.stepColony(colony, nextColony);			for (int y = 0; y < colony.getHeight(); y++) {				for (int x = 0; x < colony.getWidth(); x++) {					boolean current = colony.getCell(y, x);					boolean next = nextColony.getCell(y, x);					assertEquals(GameOfLife.willLive(current, colony.countNeighbours(y, x)), next);					if (next != current) {						changes--;					}				}			}			assertEquals(0, changes);		}	}		private void testMain(String colony, int expected) {		PrintStream oldOut = System.out;		ByteArrayOutputStream out = new ByteArrayOutputStream();		System.setOut(new PrintStream(out));		try {			GameOfLife.main(colony.split("\n"));		} catch (RuntimeException e) {			e.printStackTrace();		}		String result = out.toString();		out.reset();		boolean matches = result.matches("(?s).*" + String.valueOf(expected) + "\\s*");		assertTrue(matches);		System.setOut(oldOut);	}		public final static String glider004 =		"**\n" +		"* *\n" +		"*\n";		public final static String flipFlop100 =		" *.\n" +		" *.\n" +		".* \n";	public void testMain() {		Field[] fields = GameOfLifeTest.class.getFields();		for (int i = 0; i < fields.length; i++) {			Field field = fields[i];			if (field.getType() != String.class) {				continue;			}			if (field.getModifiers() != (Modifier.PUBLIC | Modifier.FINAL | Modifier.STATIC)) {				continue;			}			String name = field.getName();			try {				testMain((String)field.get(null), Integer.valueOf(name.substring(name.length() - 3)));			} catch (Exception e) {			}		}	}}