groovy-core/src/test/groovy/util/ProxyTest.groovy

package groovy.util

/**
* @author Dierk Koenig
**/
class ProxyTest extends GroovyTestCase {

    void testStringDecoration(){
        def original = 'decorated String'
        def proxy = new StringDecorator().wrap(original)
        // method, that is only known on proxy
        assertSame original, proxy.adaptee
        // method, that is only known on adaptee is relayed through the proxy
        assertEquals original.size(), proxy.size()
        // method, that is availabe in both objects should come from proxy
        assertEquals 0, proxy.length()
        // method, that is availabe in both objects
        // but should come from adaptee needs explicit relay
        assertEquals original, proxy.toString()
        // method from decorator, that is not in adaptee
        assertEquals 'new Method reached', proxy.someNewMethod()
    }

  /*
   *  Some test cases to probe perceived problems with each and collect on Proxy objects.
   *  cf. GROOVY-1461.  Jonathan Carlson <Jonathan.Carlson@katun.com> made a proposal for a test
   *  as a single method, Russel Winder <russel@russel.org.uk> split things up when entering
   *  them so that there is only a single assert per method to try and maximize the benefit of
   *  the tests.
   */

  void testProxyCollect ( ) {
    def collection = [ 1 , 2 , 3 ]
    def proxy = ( new Proxy ( ) ).wrap ( collection ) 
    assertEquals ( [ 2 , 3 , 4 ] , proxy.collect { it + 1 } )
  }

  void testProxyAny ( ) {
    def collection = [ 1 , 2 , 3 ]
    def proxy = ( new Proxy ( ) ).wrap ( collection ) 
    assertEquals ( true , proxy.any { it == 2 } )
  }

  void testProxyFind ( ) {
    def collection = [ 1 , 2 , 3 ]
    def proxy = ( new Proxy ( ) ).wrap ( collection ) 
    assertEquals ( 2 , proxy.find { it == 2 } )
  }

  void testProxyEach ( ) {
    def collection = [ 1 , 2 , 3 ]
    def proxy = ( new Proxy ( ) ).wrap ( collection ) 
    def testString = ''
    proxy.each { testString += it }
    assertEquals ( '123' , testString )
  }

}

class StringDecorator extends Proxy{
    int length()          { 0 }
    String toString()     { adaptee.toString()}
    String someNewMethod(){ 'new Method reached' }
}