Add a mock HTTP client class.

pkg/http/test/mock_client_test.dart

+// 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.
+
+library mock_client_test;
+
+import 'dart:io';
+import 'dart:json';
+import 'dart:uri';
+
+import '../../unittest/unittest.dart';

[Bob Nystrom, 2012/11/05 20:36:04]

Add a TODO here that this should be a 'package:' import.

[nweiz, 2012/11/05 22:35:16]

Done.

+import '../lib/http.dart' as http;
+import '../lib/src/utils.dart';
+import 'utils.dart';
+
+void main() {
+  test('handles a request', () {
+    var client = new http.MockClient();
+    client.handler = (request) {
+      return new Future.immediate(new http.Response(
+          JSON.stringify(request.bodyFields), 200,
+          headers: {'content-type': 'application/json'}));
+    };
+
+    expect(client.post("http://example.com/foo", fields: {
+      'field1': 'value1',
+      'field2': 'value2'
+    }).transform((response) => response.body), completion(parse(equals({
+      'field1': 'value1',
+      'field2': 'value2'
+    }))));
+  });
+
+  test('handles a streamed request', () {
+    var client = new http.MockClient();
+    client.streamHandler = (request, bodyStream) {
+      return consumeInputStream(bodyStream).transform((body) {
+        var stream = new ListInputStream();
+        async.then((_) {
+          var bodyString = new String.fromCharCodes(body);
+          stream.write('Request body was "$bodyString"'.charCodes);
+          stream.markEndOfStream();
+        });
+
+        return new http.StreamedResponse(stream, 200, -1);
+      });
+    };
+
+    var uri = new Uri.fromString("http://example.com/foo");
+    var request = new http.Request("POST", uri);
+    request.body = "hello, world";
+    var future = client.send(request)
+        .chain(http.Response.fromStream)
+        .transform((response) => response.body);
+    expect(future, completion(equals('Request body was "hello, world"')));

[Bob Nystrom, 2012/11/05 20:36:04]

You've organized this differently from the expect() call in the first test
(which just does the future inline). Any particular reason?

[nweiz, 2012/11/05 22:35:16]

Just aesthetics. Since the future includes a couple one-line transformations, it
looked better out-of-line.

+  });
+}