this.listener.checkAdded("key1", "value1");
Assert.assertEquals("value1", ctx1.getAttribute("key1"));
Assert.assertEquals("value1", ctx2.getAttribute("key1"));
Assert.assertEquals("value1", globalContext.getAttribute("key1"));
ctx2.removeAttribute("key1");
this.listener.checkRemoved("key1", "value1");
Assert.assertNull(ctx1.getAttribute("key1"));
Assert.assertNull(ctx2.getAttribute("key1"));
Assert.assertNull(globalContext.getAttribute("key1"));