InitialSizeTest.java

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package nginx.clojure;

import static org.junit.Assert.assertEquals;

import java.lang.reflect.Field;

import org.junit.Test;


/**
 *
 * @author Matthias Mann
 */
public class InitialSizeTest  implements Runnable {
    
    @Test
    public void test1() {
        testWithSize(1);
    }
    
    @Test
    public void test2() {
        testWithSize(2);
    }
    
    @Test
    public void test3() {
        testWithSize(3);
    }
    
    private void testWithSize(int stackSize) {
        Coroutine c = new Coroutine(this, stackSize);
        assertEquals(getStackSize(c), stackSize);
        c.run();
        assertEquals(Coroutine.State.SUSPENDED, c.getState());
        c.run();
        assertEquals(Coroutine.State.FINISHED, c.getState());
//      assertTrue(getStackSize(c) > 10);
    }

    public void run() throws SuspendExecution {
        assertEquals(3628800, factorial(10));
    }
    
    private int factorial(Integer a) throws SuspendExecution {
        if(a == 0) {
            Coroutine.yield();
            return 1;
        }
        return a * factorial(a - 1);
    }
    
    private int getStackSize(Coroutine c) {
        try {
            Field stackField = Coroutine.class.getDeclaredField("stack");
            stackField.setAccessible(true);
            Object stack = stackField.get(c);
            Field dataObjectField = Stack.class.getDeclaredField("dataObject");
            dataObjectField.setAccessible(true);
            Object[] dataObject = (Object[])dataObjectField.get(stack);
            return dataObject.length;
        } catch(Throwable ex) {
            throw new AssertionError(ex);
        }
    }
}