Properties properties = getMavenProject(project).getProperties();
        if (value == null) {
            properties.remove(key);
        } else {
            properties.setProperty(key, value);
        }
    }

    @Override
    public Map<String, String> getProperties(Project project) {
        return Collections.unmodifiableMap(

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

        if ( System.getProperties().containsKey(TestProperties.TEST_SERVER) ) {
            configs.put("properties", toMap(System.getProperties()));
        }

        if ( System.getProperties().containsKey(TestProperties.TEST_CONFIG_DIR) ) {
            try {

        return systemProperties;
    }

    /**
     * Sets the system properties to use for interpolation and profile activation. The system properties are collected
     * from the runtime environment like {@link System#getProperties()} and environment variables.
     *
     * @param systemProperties The system properties, may be {@code null}.
     * @return This context, never {@code null}.
     */
    @SuppressWarnings("unchecked")

     * environment like {@link System#getProperties()} and environment variables.
     *
     * @return The system properties, never {@code null}.
     */
    Properties getSystemProperties();

    /**
     * Sets the system properties to use for interpolation. The system properties are collected from the runtime
     * environment like {@link System#getProperties()} and environment variables.
     *

     * アノテーションの要素を名前と値の{@link Map}として返します。
     *
     * @param annotation
     *            アノテーション。{@literal null}であってはいけません
     * @return アノテーションの要素の名前と値からなる{@link Map}
     */
    public static Map<String, Object> getProperties(final Annotation annotation) {
        assertArgumentNotNull("annotation", annotation);

        final Map<String, Object> map = newHashMap();

    }


    private String getFifoPipeUrl () {
        String testFifoPipe = getProperties().get(TestProperties.TEST_FIFO_PIPE);
        Assume.assumeNotNull(testFifoPipe);
        return "smb://" + getTestServer() + "/IPC$/" + testFifoPipe;
    }


    private String getTransactPipeUrl () {
        String testTransactPipe = getProperties().get(TestProperties.TEST_TRANSACT_PIPE);
        Assume.assumeNotNull(testTransactPipe);

                        main.getArtifactId(),
                        BUILD_POM_CLASSIFIER,
                        main.getExtension(),
                        main.getVersion(),
                        main.getProperties(),
                        main.getFile()));
            }
            for (Artifact consumer : consumers) {
                result.remove(consumer);
                result.add(new DefaultArtifact(

     * using the <tt>-Djcifs.properties=</tt> commandline parameter.
     */

    public static void setProperties( Properties prp ) {
        Config.prp = new Properties( prp );
        try {
            Config.prp.putAll( System.getProperties() );
        } catch( SecurityException se ) {
            if( log.level > 1 )

        final Method m = ClassUtil.getMethod(getClass(), "testGetProperties");
        final Annotation anno = m.getAnnotation(Hoge.class);
        final Map<String, Object> props = AnnotationUtil.getProperties(anno);
        assertThat((String) props.get("aaa"), is("123"));
        assertThat((String) props.get("bbb"), is("3"));
        assertThat(props.get("ccc"), is(nullValue()));
    }

        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<>();