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Groovy example source code file (OptionalReturnTest.groovy)

This example Groovy source code file (OptionalReturnTest.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, groovytestcase, optionalreturntest, optionalreturntest

The Groovy OptionalReturnTest.groovy source code

/*
 * 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 OptionalReturnTest extends GroovyTestCase {

    def y

    void testSingleExpression() {
        def value = foo()

        assert value == 'fooReturn'
    }

    void testLastExpressionIsSimple() {
        def value = bar()

        assert value == 'barReturn'
    }

    void testLastExpressionIsBooleanExpression() {
        def value = foo2()

        assert value

        value = foo3()

        assert value == false
    }

    void testLastExpressionIsAssignment() {
        def value = assign()

        assert value == 'assignReturn'

        value = assignField()

        assert value == 'assignFieldReturn'
    }

    void testLastExpressionIsMethodCall() {
        def value = methodCall()

        assert value == 'fooReturn'
    }

    void testEmptyExpression() {
        def value = nullReturn()

        assert value == null
    }

    //  now this is not a compile time error in jsr-03

    void testVoidMethod() {
        def value = voidMethod()

        assert value == null
    }

    void testNonAssignmentLastExpressions() {
        def value = lastIsAssert()

        assert value == null
    }

    def foo() {
        'fooReturn'
    }

    def bar() {
        def x = 'barReturn'
        x
    }

    def foo2() {
        def x = 'cheese'
        x == 'cheese'
    }

    def foo3() {
        def x = 'cheese'
        x == 'edam'
    }

    def assign() {
        def x = 'assignReturn'
    }

    def assignField() {
        y = 'assignFieldReturn'
    }

    def nullReturn() {
    }

    def lastIsAssert() {
        assert 1 == 1
    }

    def methodCall() {
        foo()
    }

    void voidMethod() {
        foo()
    }
}

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