MavenSession ms = new MavenSession(null, rss, mer, null);
        ms.getRequest().setRootDirectory(Paths.get("myRootDirectory"));
        DefaultSession session =
                new DefaultSession(ms, mock(RepositorySystem.class), Collections.emptyList(), null, null, null);

        assertEquals(Paths.get("myRootDirectory"), session.getRootDirectory());
    }

        assertEquals("C:\\myRootDirectory/.mvn/foo", request.getUserProperties().getProperty("valRootDirectory"));
        assertEquals(
                "C:\\myRootDirectory\\myTopDirectory/pom.xml",
                request.getUserProperties().getProperty("valTopDirectory"));
        assertEquals("C:\\myRootDirectory/my-child", request.getCommandLine().getOptionValue('f'));
        assertArrayEquals(

        assertEquals(RootLocator.UNABLE_TO_FIND_ROOT_PROJECT_MESSAGE, e.getMessage());
    }

    @Test
    void testRootDirectory() throws Exception {
        this.rootDirectory = Paths.get("myRootDirectory");
        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), new Properties());
        assertInstanceOf(Path.class, ee.evaluate("${session.rootDirectory}"));
    }

        assertEquals(RootLocator.UNABLE_TO_FIND_ROOT_PROJECT_MESSAGE, e.getMessage());
    }

    @Test
    void testRootDirectory() throws Exception {
        this.rootDirectory = Paths.get("myRootDirectory");
        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), null, new Properties());
        assertInstanceOf(Path.class, ee.evaluate("${session.rootDirectory}"));
    }

    @Test