CollectionUtilsTest.java

package org.codehaus.plexus.util;

/*
 * Copyright The Codehaus Foundation.
 *
 * 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.
 */

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertNull;

/**
 * <p>CollectionUtilsTest class.</p>
 *
 * @author herve
 * @version $Id: $Id
 * @since 3.4.0
 */
class CollectionUtilsTest {
    /**
     * <p>testMergeMaps.</p>
     */
    @Test
    void mergeMaps() {
        Map<String, String> dominantMap = new HashMap<>();
        dominantMap.put("a", "a");
        dominantMap.put("b", "b");
        dominantMap.put("c", "c");
        dominantMap.put("d", "d");
        dominantMap.put("e", "e");
        dominantMap.put("f", "f");

        Map<String, String> recessiveMap = new HashMap<>();
        recessiveMap.put("a", "invalid");
        recessiveMap.put("b", "invalid");
        recessiveMap.put("c", "invalid");
        recessiveMap.put("x", "x");
        recessiveMap.put("y", "y");
        recessiveMap.put("z", "z");

        Map<String, String> result = CollectionUtils.mergeMaps(dominantMap, recessiveMap);

        // We should have 9 elements
        assertEquals(9, result.size());

        // Check the elements.
        assertEquals("a", result.get("a"));
        assertEquals("b", result.get("b"));
        assertEquals("c", result.get("c"));
        assertEquals("d", result.get("d"));
        assertEquals("e", result.get("e"));
        assertEquals("f", result.get("f"));
        assertEquals("x", result.get("x"));
        assertEquals("y", result.get("y"));
        assertEquals("z", result.get("z"));
    }

    /**
     * <p>testMergeMapArray.</p>
     */
    @SuppressWarnings("unchecked")
    @Test
    void mergeMapArray() {
        // Test empty array of Maps
        Map<String, String> result0 = CollectionUtils.mergeMaps(new Map[] {});

        assertNull(result0);

        // Test with an array with a single element.
        Map<String, String> map1 = new HashMap<>();
        map1.put("a", "a");

        Map<String, String> result1 = CollectionUtils.mergeMaps(new Map[] {map1});

        assertEquals("a", result1.get("a"));

        // Test with an array with two elements.
        Map<String, String> map2 = new HashMap<>();
        map2.put("a", "aa");
        map2.put("b", "bb");

        Map<String, String> result2 = CollectionUtils.mergeMaps(new Map[] {map1, map2});

        assertEquals("a", result2.get("a"));
        assertEquals("bb", result2.get("b"));

        // Now swap the dominant order.
        Map<String, String> result3 = CollectionUtils.mergeMaps(new Map[] {map2, map1});

        assertEquals("aa", result3.get("a"));
        assertEquals("bb", result3.get("b"));

        // Test with an array with three elements.
        Map<String, String> map3 = new HashMap<>();
        map3.put("a", "aaa");
        map3.put("b", "bbb");
        map3.put("c", "ccc");

        Map<String, String> result4 = CollectionUtils.mergeMaps(new Map[] {map1, map2, map3});

        assertEquals("a", result4.get("a"));
        assertEquals("bb", result4.get("b"));
        assertEquals("ccc", result4.get("c"));

        // Now swap the dominant order.
        Map<String, String> result5 = CollectionUtils.mergeMaps(new Map[] {map3, map2, map1});

        assertEquals("aaa", result5.get("a"));
        assertEquals("bbb", result5.get("b"));
        assertEquals("ccc", result5.get("c"));
    }

    /**
     * <p>testMavenPropertiesLoading.</p>
     */
    @Test
    void mavenPropertiesLoading() {
        // Mimic MavenSession properties loading. Properties listed
        // in dominant order.
        Properties systemProperties = new Properties();
        Properties userBuildProperties = new Properties();
        Properties projectBuildProperties = new Properties();
        Properties projectProperties = new Properties();
        Properties driverProperties = new Properties();

        // System properties
        systemProperties.setProperty("maven.home", "/projects/maven");

        // User build properties
        userBuildProperties.setProperty("maven.username", "jvanzyl");
        userBuildProperties.setProperty("maven.repo.remote.enabled", "false");
        userBuildProperties.setProperty("maven.repo.local", "/opt/maven/artifact");

        // Project build properties
        projectBuildProperties.setProperty("maven.final.name", "maven");

        String mavenRepoRemote = "http://www.ibiblio.org/maven,http://foo/bar";

        // Project properties
        projectProperties.setProperty("maven.repo.remote", mavenRepoRemote);

        String basedir = "/home/jvanzyl/projects/maven";

        // Driver properties
        driverProperties.setProperty("basedir", basedir);
        driverProperties.setProperty("maven.build.src", "${basedir}/src");
        driverProperties.setProperty("maven.build.dir", "${basedir}/target");
        driverProperties.setProperty("maven.build.dest", "${maven.build.dir}/classes");
        driverProperties.setProperty("maven.repo.remote", "http://www.ibiblio.org/maven");
        driverProperties.setProperty("maven.final.name", "maven-1.0");
        driverProperties.setProperty("maven.repo.remote.enabled", "true");
        driverProperties.setProperty("maven.repo.local", "${maven.home}/artifact");

        Map result = CollectionUtils.mergeMaps(new Map[] {
            systemProperties, userBuildProperties, projectBuildProperties, projectProperties, driverProperties
        });

        // Values that should be taken from systemProperties.
        assertEquals("/projects/maven", result.get("maven.home"));

        // Values that should be taken from userBuildProperties.
        assertEquals("/opt/maven/artifact", result.get("maven.repo.local"));
        assertEquals("false", result.get("maven.repo.remote.enabled"));
        assertEquals("jvanzyl", result.get("maven.username"));

        // Values take from projectBuildProperties.
        assertEquals("maven", result.get("maven.final.name"));

        // Values take from projectProperties.
        assertEquals(mavenRepoRemote, result.get("maven.repo.remote"));
    }

    /**
     * <p>testIteratorToListWithAPopulatedList.</p>
     */
    @Test
    void iteratorToListWithAPopulatedList() {
        List<String> original = new ArrayList<>();

        original.add("en");
        original.add("to");
        original.add("tre");

        List<String> copy = CollectionUtils.iteratorToList(original.iterator());

        assertNotNull(copy);

        assertEquals(3, copy.size());

        assertEquals("en", copy.get(0));
        assertEquals("to", copy.get(1));
        assertEquals("tre", copy.get(2));
    }

    /**
     * <p>testIteratorToListWithAEmptyList.</p>
     */
    @Test
    void iteratorToListWithAEmptyList() {
        List<String> original = new ArrayList<>();

        List<String> copy = CollectionUtils.iteratorToList(original.iterator());

        assertNotNull(copy);

        assertEquals(0, copy.size());
    }
}