String requiredMavenVersion = (String) result.getProperties().get("prerequisites.maven");
            if (requiredMavenVersion != null) {
                Map<String, String> props = new LinkedHashMap<>(pluginArtifact.getProperties());
                props.put("requiredMavenVersion", requiredMavenVersion);
                pluginArtifact = pluginArtifact.setProperties(props);
            }

        String checkValue = "value";

        Properties properties = new Properties();
        properties.setProperty(key, checkValue);

        Model model = new Model();
        model.setProperties(properties);

        MavenProject project = new MavenProject(model);

        ExpressionEvaluator ee = createExpressionEvaluator(project, null, new Properties());

            if (sourceDominant) {
                merged.putAll(target.getProperties());
                putAll(merged, source.getProperties(), CHILD_DIRECTORY_PROPERTY);
            } else {
                putAll(merged, source.getProperties(), CHILD_DIRECTORY_PROPERTY);
                merged.putAll(target.getProperties());
            }
            builder.properties(merged);
            builder.location(

        Model out = interpolator.interpolateModel(model, new File("."), createModelBuildingRequest(context), collector);
        assertProblemFree(collector);

        assertEquals("/path/to/home", out.getProperties().get("outputDirectory"));
    }

    @Test
    public void envarExpressionThatEvaluatesToNullReturnsTheLiteralString() throws Exception {

        Map<String, String> modelProperties = new HashMap<>();

            final Model model,
            final Path projectDir,
            final ModelBuildingRequest config,
            ModelProblemCollector problems) {
        Map<String, String> modelProperties = model.getProperties();

        ValueSource projectPrefixValueSource;
        ValueSource prefixlessObjectBasedValueSource;
        if (config.getValidationLevel() >= ModelBuildingRequest.VALIDATION_LEVEL_MAVEN_4_0) {

        String key = "m2.name";
        String checkValue = "value";

        MavenProject project = createDefaultProject();
        project.getModel().getProperties().setProperty(key, checkValue);

        ExpressionEvaluator ee = createExpressionEvaluator(project, new Properties());

        Object value = ee.evaluate("${" + key + "}");

    @AfterEach
    void tearDown() throws Exception {
        if (origBasedir != null) {
            System.setProperty(MavenCli.MULTIMODULE_PROJECT_DIRECTORY, origBasedir);
        } else {
            System.getProperties().remove(MavenCli.MULTIMODULE_PROJECT_DIRECTORY);
        }
    }

    @Test
    void testPerformProfileActivation() throws ParseException {
        final CommandLineParser parser = new DefaultParser();

    }

    protected List<ValueSource> createValueSources(
            Model model, Path projectDir, ModelBuilderRequest request, ModelProblemCollector problems) {
        Map<String, String> modelProperties = model.getProperties();

        ValueSource projectPrefixValueSource;
        ValueSource prefixlessObjectBasedValueSource;
        if (request.getValidationLevel() >= ModelBuilderRequest.VALIDATION_LEVEL_MAVEN_4_0) {

        // re-build pom with modified parent
        ProjectBuildingResult result = projectBuilder.build(child, configuration);
        assertThat(result.getProject().getProperties(), hasKey((Object) "addedProperty"));
    }

    @Test
    void testReadErroneousMavenProjectContainsReference() throws Exception {

    /**
     * コンテキストクラスローダからプロパティファイルをロードして返します。
     *
     * @param path
     *            プロパティファイルのパス。{@literal null}や空文字列であってはいけません
     * @return プロパティファイル
     */
    public static Properties getProperties(final String path) {
        assertArgumentNotEmpty("path", path);

        final Properties props = new Properties();
        final InputStream is = getResourceAsStream(path);
        try {