Adding Angular and dependent packages for testing

third_party/pkg/angular/lib/mock/log.dart

+part of angular.mock;
+
+/**
+ * A convenient way to assert the order in which the DOM elements are processed.
+ *
+ * In your test create:
+ *
+ *     <div log="foo">...</div>
+ *
+ * And then assert:
+ *
+ *     expect(logger).toEqual(['foo']);
+ */
+@NgDirective(
+    selector: '[log]',
+    map: const {
+        'log': '@logMessage'
+    }
+)
+class LogAttrDirective implements NgAttachAware {
+  final Logger log;
+  String logMessage;
+  LogAttrDirective(this.log);
+  attach() => log(logMessage == '' ? 'LOG' : logMessage);
+}
+
+/**
+ * A convenient way to verify that a set of operations executed in a specific
+ * order. Simply inject the Logger into each operation and call:
+ *
+ *     operation1(Logger logger) => logger('foo');
+ *     operation2(Logger logger) => logger('bar');
+ *
+ *  Then in the test:
+ *
+ *     expect(logger).toEqual(['foo', 'bar']);
+ */
+class Logger extends ListBase {
+  final List tokens = [];
+
+  /**
+   * Add string token to the list.
+   */
+  call(dynamic text) => tokens.add(text);
+
+  /**
+   * Return a `;` separated list of recorded tokens.
+   */
+  String result() => tokens.join('; ');
+
+
+  int get length => tokens.length;
+
+  operator [](int index) => tokens[index];
+
+  void operator []=(int index, value) { tokens[index] = value; }
+
+  void set length(int newLength) { tokens.length = newLength; }
+}