Check the state of the HTTP request and response when handling headers

tests/standalone/src/io/HttpContentLengthTest.dart

Index: tests/standalone/src/io/HttpContentLengthTest.dart
diff --git a/tests/standalone/src/io/HttpContentLengthTest.dart b/tests/standalone/src/io/HttpContentLengthTest.dart
new file mode 100644
index 0000000000000000000000000000000000000000..cf2614588f647c6def0d187187f3c253d8ca7087
--- /dev/null
+++ b/tests/standalone/src/io/HttpContentLengthTest.dart
@@ -0,0 +1,85 @@
+// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+//
+
+#import("dart:isolate");
+#import("dart:io");
+
+void testNoBody(int totalConnections) {
+  HttpServer server = new HttpServer();
+  server.onError = (e) => Expect.fail("Unexpected error $e");
+  server.listen("127.0.0.1", 0, totalConnections);
+  server.defaultRequestHandler = (HttpRequest request, HttpResponse response) {
+    response.contentLength = 0;
+    OutputStream stream = response.outputStream;
+    Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+    stream.close();
+    Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+  };
+
+  int count = 0;
+  HttpClient client = new HttpClient();
+  for (int i = 0; i < totalConnections; i++) {
+    HttpClientConnection conn = client.get("127.0.0.1", server.port, "/");
+    conn.onError = (e) => Expect.fail("Unexpected error $e");
+    conn.onRequest = (HttpClientRequest request) {
+      OutputStream stream = request.outputStream;
+      Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+      stream.close();
+      Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+    };
+    conn.onResponse = (HttpClientResponse response) {
+      count++;
+      if (count == totalConnections) {
+        client.shutdown();
+        server.close();
+      }
+    };
+  }
+}
+
+void testBody(int totalConnections) {
+  HttpServer server = new HttpServer();
+  server.onError = (e) => Expect.fail("Unexpected error $e");
+  server.listen("127.0.0.1", 0, totalConnections);
+  server.defaultRequestHandler = (HttpRequest request, HttpResponse response) {
+    response.contentLength = 2;
+    OutputStream stream = response.outputStream;
+    stream.writeString("x");
+    Expect.throws(() => response.contentLength = 3, (e) => e is HttpException);
+    stream.writeString("x");
+    Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+    stream.close();
+    Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+  };
+
+  int count = 0;
+  HttpClient client = new HttpClient();
+  for (int i = 0; i < totalConnections; i++) {
+    HttpClientConnection conn = client.get("127.0.0.1", server.port, "/");
+    conn.onError = (e) => Expect.fail("Unexpected error $e");
+    conn.onRequest = (HttpClientRequest request) {
+      request.contentLength = 2;
+      OutputStream stream = request.outputStream;
+      stream.writeString("x");
+      Expect.throws(() => request.contentLength = 3, (e) => e is HttpException);
+      stream.writeString("x");
+      Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+      stream.close();
+      Expect.throws(() => stream.writeString("x"), (e) => e is HttpException);
+    };
+    conn.onResponse = (HttpClientResponse response) {
+      count++;
+      if (count == totalConnections) {
+        client.shutdown();
+        server.close();
+      }
+    };
+  }
+}
+
+void main() {
+  testNoBody(5);
+  testBody(5);
+}