Adding Angular and dependent packages for testing

third_party/pkg/route_hierarchical/lib/url_matcher.dart

+library url_matcher;
+
+import 'package:unittest/matcher.dart';
+
+/**
+ * A reversible URL matcher interface.
+ */
+abstract class UrlMatcher {
+
+  /**
+   * Attempts to match a given URL. If match is successul then returns an
+   * instance or [UrlMatch], otherwise returns [null].
+   */
+  UrlMatch match(String url);
+
+  /**
+   * Reverses (reconstructs) a URL from optionally provided parameters map
+   * and a tail.
+   */
+  String reverse({Map parameters, String tail});
+
+  /**
+   * Returns a list of named parameters in the URL.
+   */
+  List<String> urlParameterNames();
+}
+
+/**
+ * Object representing a successul URL match.
+ */
+class UrlMatch {
+
+  /// Matched section of the URL
+  final String match;
+
+  /// Remaining unmatched suffix
+  final String tail;
+
+  ///
+  final Map parameters;
+
+  UrlMatch(this.match, this.tail, this.parameters);
+
+  bool operator ==(o) {
+    if (!(o is UrlMatch)) {
+      return false;
+    }
+    return o.match == match && o.tail == tail &&
+        equals(o.parameters, 1).matches(parameters, null);
+  }
+
+  String toString() {
+    return '{$match, $tail, $parameters}';
+  }
+}