groovy-core/src/test/groovy/util/GroovyCollectionsTest.groovy

/*
 * Copyright 2003-2007 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.util

import static GroovyCollections.min
import static GroovyCollections.max
import static GroovyCollections.combinations
import static GroovyCollections.transpose
import static GroovyCollections.sum

/**
* Tests GroovyCollections
*
* @author Paul King
*/
public class GroovyCollectionsTest extends GroovyTestCase {

    void testCombinations() {
        // use Sets because we don't care about order
        Set expected = [
                        ['a', 1], ['a', 2], ['a', 3],
                        ['b', 1], ['b', 2], ['b', 3]
                ]
        Collection input = [['a', 'b'], [1, 2, 3]]

        // normal varargs versions should match Object[]
        assert GroovyCollections.combinations(['a', 'b'], [1, 2, 3]) as Set == expected
        assert combinations(['a', 'b'], [1, 2, 3]) as Set == expected

        // spread versions should match Object[]
        assert GroovyCollections.combinations(*input) as Set == expected
        assert combinations(*input) as Set == expected

        // collection versions should match Collection
        assert GroovyCollections.combinations(input) as Set == expected
        assert combinations(input) as Set == expected
    }

    void testTranspose() {
        // normal varargs versions should match Object[]
        assert GroovyCollections.transpose(['a', 'b'], [1, 2, 3]) == [['a', 1], ['b', 2]]
        assert transpose(['a', 'b'], [1, 2, 3]) == [['a', 1], ['b', 2]]
        assert GroovyCollections.transpose([1, 2, 3], [4, 5, 6]) == [[1, 4], [2, 5], [3, 6]]
        assert transpose([1, 2, 3], [4, 5, 6]) == [[1, 4], [2, 5], [3, 6]]
        assert GroovyCollections.transpose([1, 2, 3], [4, 5], [9], [6, 7, 8]) == [[1, 4, 9, 6]]
        assert transpose([1, 2, 3], [4, 5], [9], [6, 7, 8]) == [[1, 4, 9, 6]]

        // collection versions
        assert GroovyCollections.transpose([[1, 2, 3]]) == [[1], [2], [3]]
        assert transpose([[1, 2, 3]]) == [[1], [2], [3]]
        assert GroovyCollections.transpose([]) == []
        assert transpose([]) == []
    }

    void testMin() {
        // normal varargs versions should match Object[]
        assert GroovyCollections.min('a', 'b') == 'a'
        assert min('a', 'b') == 'a'
        assert GroovyCollections.min(1, 2, 3) == 1
        assert min(1, 2, 3) == 1

        // collection versions
        assert GroovyCollections.min(['a', 'b']) == 'a'
        assert min(['a', 'b']) == 'a'
        assert GroovyCollections.min([1, 2, 3]) == 1
        assert min([1, 2, 3]) == 1
    }

    void testMax() {
        // normal varargs versions should match Object[]
        assert GroovyCollections.max('a', 'b') == 'b'
        assert max('a', 'b') == 'b'
        assert GroovyCollections.max(1, 2, 3) == 3
        assert max(1, 2, 3) == 3

        // collection versions
        assert GroovyCollections.max(['a', 'b']) == 'b'
        assert max(['a', 'b']) == 'b'
        assert GroovyCollections.max([1, 2, 3]) == 3
        assert max([1, 2, 3]) == 3
    }

    void testSum() {
        // normal varargs versions should match Object[]
        assert GroovyCollections.sum('a', 'b') == 'ab'
        assert sum('a', 'b') == 'ab'
        assert GroovyCollections.sum(1, 2, 3) == 6
        assert sum(1, 2, 3) == 6

        // collection versions
        assert GroovyCollections.sum(['a', 'b']) == 'ab'
        assert sum(['a', 'b']) == 'ab'
        assert GroovyCollections.sum([1, 2, 3]) == 6
        assert sum([1, 2, 3]) == 6
    }

}