File file = new File(tempDir.resolve("file.txt").toString());
        if (!file.createNewFile()) {
            throw new IOException("Can't create " + file);
        }
    }

    @Test
    void testRootDirectoryWithNull() {
        context.setProjectDirectory(null);

        IllegalStateException e = assertThrows(
                IllegalStateException.class,

        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), new Properties());
        assertNull(ee.evaluate("${rootDirectory}"));
    }

    @Test
    void testRootDirectoryWithNull() throws Exception {
        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), new Properties());
        Exception e = assertThrows(Exception.class, () -> ee.evaluate("${session.rootDirectory}"));

        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), null, new Properties());
        assertNull(ee.evaluate("${rootDirectory}"));
    }

    @Test
    void testRootDirectoryWithNull() throws Exception {
        ExpressionEvaluator ee = createExpressionEvaluator(createDefaultProject(), null, new Properties());