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Groovy example source code file (MethodMissingTest.groovy)

This example Groovy source code file (MethodMissingTest.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

groovytestcase, methodmissingtest, mmtest, mmtest, mmtest2, mmtest2, mmtest3, mmtest5, mmtest5, mmtest6, string, string

The Groovy MethodMissingTest.groovy source code

/*
 * Copyright 2003-2009 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package groovy.lang

/**
 * Tests for method missing handling in Groovy

 * @author Graeme Rocher
 * @since 1.5
 */
class MethodMissingTest extends GroovyTestCase {

    void testOverrideStaticMethodMissingTwice() {
        MMTest2.metaClass.'static'.methodMissing = { String name, args -> "foo" }
        assertEquals "foo",MMTest2.doStuff()
        MMTest2.metaClass.'static'.methodMissing = { String name, args -> "bar" }
        assertEquals "bar",MMTest2.doStuff()
    }

    void testSimpleMethodMissing() {
        def t = new MMTest()
        assertEquals "world", t.hello()
        assertEquals "foo", t.stuff()
    }

    void testMethodMissingViaMetaClass() {
        def t1 = new MMTest2()
        shouldFail(MissingMethodException) {
            t1.stuff()
        }
        assertEquals "world", t1.hello()
        MMTest2.metaClass.methodMissing = { String name, args ->
            "foo"
        }
        def t2 = new MMTest2()
        assertEquals "world", t2.hello()
        assertEquals "foo", t2.stuff()
    }

    void testMethodMissingWithRegistration() {
        MMTest2.metaClass.methodMissing = { String name, args ->
             MMTest2.metaClass."$name" = {-> "bar" }        
            "foo"
        }
        def t2 = new MMTest2()
        assertEquals "world", t2.hello()
        assertEquals "foo", t2.stuff()
        assertEquals "bar", t2.stuff()

    }


    void testStaticMethodMissingViaMetaClass() {

        assertEquals "world", MMTest3.hello()
        shouldFail(MissingMethodException) {
            MMTest3.stuff()            
        }
        MMTest3.metaClass.'static'.methodMissing = { String name, args->
             "foo"
        }

        assertEquals "world", MMTest3.hello()
        assertEquals "foo", MMTest3.stuff()
    }

    void testMethodMissingWithInheritance() {
         assertEquals "world",MMTest6.hello()
         assertEquals "cruel world",MMTest6.goodbye()

         MMTest6.metaClass.'static'.methodMissing = { String name, args ->
            "foo"
         }
         assertEquals "foo",MMTest6.bar()

         shouldFail(MissingMethodException) {
             MMTest5.bar()
         }
    }

}

class MMTest {
    def hello() { "world" }
    def methodMissing(String name, args) {
        "foo"
    }
}

class MMTest2 {
    def hello() { "world" }
}

class MMTest3 {
    static hello() { "world" }
}

class MMTest5 {
    static hello() { "world" }
}

class MMTest6 extends MMTest5 {
    static goodbye() { "cruel world" }
}

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