Tweaked test case

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpasyncclient/trunk@1672851 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/httpasyncclient/src/test/java/org/apache/http/nio/client/integration/TestHttpAsyncPipelining.java b/httpasyncclient/src/test/java/org/apache/http/nio/client/integration/TestHttpAsyncPipelining.java
index f8a4f31..06207d8 100644
--- a/httpasyncclient/src/test/java/org/apache/http/nio/client/integration/TestHttpAsyncPipelining.java
+++ b/httpasyncclient/src/test/java/org/apache/http/nio/client/integration/TestHttpAsyncPipelining.java
@@ -211,7 +211,8 @@
                 future.get();
             } catch (ExecutionException ex) {
                 final Throwable cause = ex.getCause();
-                Assert.assertTrue(cause instanceof ConnectionClosedException);
+                Assert.assertNotNull(cause);
+                Assert.assertEquals(cause.getClass(), ConnectionClosedException.class);
             }
             Assert.assertTrue(c1.isDone());
             Assert.assertNotNull(c1.getResult());