public void testMultipleNegations() {
    assertEquals(true,
        executeExpression(MVEL.compileExpression("!false")));
    assertEquals(false,
        executeExpression(MVEL.compileExpression("!!false")));
    assertEquals(true,
        executeExpression(MVEL.compileExpression("!!!false")));
    assertEquals(false,
        executeExpression(MVEL.compileExpression("!!!!false")));
  }