groovy/modules/classic/src/test/groovy/ClosureTest.groovy

/** 
 * Tests Closures in Groovy
 * 
 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
 * @version $Revision$
 */
class ClosureTest extends GroovyTestCase {

	property count

    void testSimpleBlockCall() {
        count = 0

        block = {owner| owner.incrementCallCount() }
        
        assertClosure(block)
        assert count == 1

        assertClosure({owner| owner.incrementCallCount() })
        assert count == 2
    }

    void testVariableLengthParameterList() {

        c1 = {| Object[] args | args.each{count += it}}
        
        count = 0
        c1(1, 2, 3)
        assert count == 6
        
        count = 0
        c1(1)
        assert count == 1
         
        count = 0
        c1(new Object[]{1, 2, 3})
        assert count == 6

        c2 = {| a, Object[] args | count += a; args.each{count += it}}
        
        count = 0
        c2(1, 2, 3)
        assert count == 6
        
        count = 0
        c2(1)
        assert count == 1
         
        count = 0
        c2(1, new Object[]{2, 3})
        assert count == 6
    }

    void testBlockAsParameter() {
        count = 0
        
        callBlock(5, {owner| owner.incrementCallCount() })
        assert count == 6

        callBlock2(5, {owner| owner.incrementCallCount() })
        assert count == 12
    }
  
    void testMethodClosure() {
        block = this.incrementCallCount

        count = 0
  	    
        block.call()
  	    
        assert count == 1
  	        
        block = System.out.println
  	    
        block.call("I just invoked a closure!")
    }
  
    incrementCallCount() {
        //System.out.println("invoked increment method!")
        count = count + 1
    }
	
    assertClosure(Closure block) {
        assert block != null
        block.call(this)
    }
	
    protected callBlock(Integer num, Closure block) {
        for ( i in 0..num ) {
            block.call(this)
        }
    }

    protected callBlock2(num, block) {
        for ( i in 0..num ) {
            block.call(this)
        }
    }


    int numAgents = 4
    boolean testDone = false

    void testIntFieldAccess() {
        agents = new ArrayList();
        numAgents.times {
            TinyAgent btn = new TinyAgent()
            testDone = true
            btn.x = numAgents
            agents.add(btn)
        }
        assert agents.size() == numAgents
    }
}

public class TinyAgent {
    int x
}