assertNotNull(builder);

        DefaultSettingsBuildingRequest request = new DefaultSettingsBuildingRequest();
        request.setSystemProperties(System.getProperties());
        request.setUserSettingsFile(getSettings("simple"));

        SettingsBuildingResult result = builder.build(request);
        assertNotNull(result);
        assertNotNull(result.getEffectiveSettings());

                            BUILD_POM_CLASSIFIER,
                            main.getExtension(),
                            main.getVersion(),
                            main.getProperties(),
                            main.getPath()));
                }
                // If deployBuildPom is false, we simply don't add the build POM to the result
            }

        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<>();

     *
     * @param annotation the annotation (must not be {@literal null})
     * @return a {@link Map} of annotation element names and values
     */
    public static Map<String, Object> getProperties(final Annotation annotation) {
        assertArgumentNotNull("annotation", annotation);

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

     * 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.
     *

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

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

        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")

        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()));
    }

        ModelBuildingResult result = builder.build(request);
        assertNotNull(result);
        assertNotNull(result.getEffectiveModel());
        assertEquals("activated", result.getEffectiveModel().getProperties().get("profile.file"));
        Xpp3Dom conf = (Xpp3Dom)
                result.getEffectiveModel().getBuild().getPlugins().get(0).getConfiguration();
        assertNotNull(conf);

        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        try (ObjectOutputStream oos = new ObjectOutputStream(baos)) {
            oos.writeObject(model.getProperties());
            oos.writeObject(model.getBuild().getPlugins());
        }
    }