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Groovy example source code file (MethodParameterAccessWithinClosureTest.groovy)

This example Groovy source code file (MethodParameterAccessWithinClosureTest.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

a, a, b, b, groovytestcase, methodparameteraccesswithinclosuretest, methodparameteraccesswithinclosuretest, string, string

The Groovy MethodParameterAccessWithinClosureTest.groovy source code

package groovy

/**
 * To test access to method scoped variable within closure
 * 
 * @author <a href="mailto:jeremy.rayner@bigfoot.com">Jeremy Rayner
 * @version $Revision: 8042 $
 */


class MethodParameterAccessWithinClosureTest extends GroovyTestCase { 
    def cheese
    def shop
       
    void setUp() {
        cheese = null
        shop = ["wensleydale"]
    }              
    void testSimpleMethodParameterAccess() { 
        assert "wensleydale" == vendor1("wensleydale") 
    }
    void testMethodParameterWithDifferentNameToPropertyUsingClosure() {
        assert "wensleydale" == vendor2("wensleydale")
    }
    void testMethodParameterWithSameNameAsPropertyUsingClosure() {
        assert "wensleydale" == vendor3("wensleydale")
    }
    
    void testOptionalMethodParameterUsedInClosure() {
        assert "wensleydale" == vendor4("wensleydale")
        assert null == vendor4()
    }
    
    void testDoubleParameterAndsingleParameterUsedInClosure() {
         assert vendor5(5.0d,2) == 7.0d
    }
    
    void testAccessToMethodParameterInOverwrittenMethodCalledBySuper() {
         //  GROOVY-2107
         assertScript """
           class A {
             // the closure is accessing the parameter
             def foo(x){ return {x}}
           }
           class B extends A {
              def foo(y) {
                 super.foo(y+1)
              }
           }
           def b = new B()
           assert b.foo(1).call() == 2
        """        
    }
    
    private String vendor1(cheese) {
        cheese
    }
    
    private String vendor2(aCheese) {
        shop.find() {it == aCheese}
    }
    
    private String vendor3(cheese) {
        shop.find() {it == cheese}
    }
    
    /** note: cheese is a field, that is intended **/
    private vendor4(aCheese=cheese) {
        shop.find() {it == aCheese}
    }
    
    private vendor5(double a, int b) {
        b.times {a++}
        return a
    }
}

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