Change the handling of the close event in the StringInputStream

tests/standalone/src/StringStreamTest.dart

Index: tests/standalone/src/StringStreamTest.dart
diff --git a/tests/standalone/src/StringStreamTest.dart b/tests/standalone/src/StringStreamTest.dart
index f6d70fb1c5d1f7329da42c867b63591fdd690e1f..9c7f3718b85fa339e7d5801180e7ff0d9417cd1c 100644
--- a/tests/standalone/src/StringStreamTest.dart
+++ b/tests/standalone/src/StringStreamTest.dart
@@ -121,7 +121,13 @@ void testReadLine1() {
       stage++;
     }
   }
+
+  void streamClosed() {
+    Expect.equals(2, stage);
+  }
+
   stream.dataHandler = stringData;
+  stream.closeHandler = streamClosed;
   s.write("Line".charCodes());
   Expect.equals(2, stage);
 }
@@ -172,7 +178,13 @@ void testReadLine2() {
       stage++;
     }
   }
+
+  void streamClosed() {
+    Expect.equals(4, stage);
+  }
+
   stream.dataHandler = stringData;
+  stream.closeHandler = streamClosed;
   s.write("Line1\nLine2\r\nLine3\rLi".charCodes());
   Expect.equals(4, stage);
 }