src/test/groovy/GeneratorTest.groovy

/*
 * Copyright 2003-2010 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

class GeneratorTest extends GroovyTestCase {

    void testGenerator() {
        def x = this.&sampleGenerator
        //System.out.println("x: " + x)

        def result = ''
        for (i in x) {
            result = result + i
        }

        assert result == "ABC"
    }

    void testFindAll() {
        def x = this.&sampleGenerator

        def value = x.findAll { item -> return item == "C" }
        assert value == ["C"]

        value = x.findAll { item -> return item != "B" }
        assert value == ["A", "C"]
    }

    void testEach() {
        def x = this.&sampleGenerator

        def value = x.each { println(it) }
    }

    void testMissingThisBug() {
        def result = ''
        for (i in this.&sampleGenerator) {
            result = result + i
        }

        assert result == "ABC"
    }

    void sampleGenerator(closure) {
        // kinda like yield statements
        closure.call("A")
        closure.call("B")
        closure.call("C")
    }
}