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Groovy example source code file (SingletonTransformTest.groovy)

This example Groovy source code file (SingletonTransformTest.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

bye-bye, groovyshelltestcase, hello, hello, singleton, singleton, singletontransformtest, world, world, x, x

The Groovy SingletonTransformTest.groovy source code

/*
 * Copyright 2003-2008 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 org.codehaus.groovy.transform

/**
 * @author Alex Tkachman
 */
class SingletonTransformTest extends GroovyShellTestCase {

    void testSingleton() {
        def res = evaluate("""
              @Singleton
              class X {
                 def getHello () {
                   "Hello, World!"
                 }
              }

              X.instance.hello
        """)

        assertEquals("Hello, World!", res)
    }

    void testLazySingleton() {
        def res = evaluate("""
              @Singleton(lazy=true)
              class X {
                 def getHello () {
                   "Hello, World!"
                 }
              }

              assert X.@instance == null

              X.instance.hello
        """)

        assertEquals("Hello, World!", res)
    }

    void testSingletonInstantiationFails() {
        shouldFail {
            evaluate("""
                  @Singleton
                  class X {
                     def getHello () {
                       "Hello, World!"
                     }
                  }

                  new X ()
            """)
        }
    }

    void testSingletonOverideConstructorFails() {
            def res = evaluate("""
                  @Singleton
                  class X {
                     static hello = "Bye-bye world"

                     X () {
                        hello = "Hello, World!"
                     }
                  }

                  X.instance.hello
            """)

            assertEquals("Hello, World!", res)
    }
}

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