src/test/groovy/OptionalReturnTest.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 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()
    }
}