feat(http): Added a testable wrapper around dart:html's HttpRequest

Author: jbdeboer

lib/angular.dart

@@ -1,6 +1,7 @@
 library angular;
 
 import "dart:mirrors";
+import "dart:async" as async;
 import "dart:json" as json;
 import 'dart:html' as dom;
 import 'package:di/di.dart';
@@ -16,6 +17,7 @@ part 'directives/ng_mustache.dart';
 part 'directives/ng_repeat.dart';
 part 'dom_utilities.dart';
 part 'exception_handler.dart';
+part 'http.dart';
 part 'interpolate.dart';
 part 'mirrors.dart';
 part 'node_cursor.dart';

lib/http.dart

@@ -0,0 +1,6 @@
+part of angular;
+
+class Http {
+  async.Future<String> getString(String url, {bool withCredentials, void onProgress(dom.ProgressEvent e)}) =>
+    dom.HttpRequest.getString(url, withCredentials, onProgress);
+}

test/_http.dart

@@ -0,0 +1,20 @@
+library ng_mock_http;
+
+
+import 'dart:async';
+import 'dart:html';
+import 'package:angular/angular.dart';
+
+class MockHttp extends Http {
+  Map<String, String> gets = {};
+  expectGET(url, content) {
+    gets[url] = content;
+  }
+
+  Future<String> getString(String url, {bool withCredentials, void onProgress(ProgressEvent e)}) {
+    if (!gets.containsKey(url)) throw "Unexpected URL $url";
+    return new Future.value(gets.remove(url));
+  }
+}
+
+main() {}

test/_http_spec.dart

@@ -0,0 +1,24 @@
+import "_specs.dart";
+import "_http.dart";
+
+main() {
+  describe("MockHttp", () {
+    MockHttp http;
+    beforeEach(() {
+      http = new MockHttp();
+    });
+
+    it('should replay an http request', () {
+     http.expectGET('request', 'response');
+     http.getString('request').then(expectAsync1((data) {
+       expect(data).toEqual('response');
+     }));
+    });
+
+    it('should barf on an unseen request', () {
+      expect(() {
+        http.getString('unknown');
+      }).toThrow('Unexpected URL unknown');
+    });
+  });
+}