Add a shelf handler for running one-off handlers.

test/one_off_handler_test.dart

Index: test/one_off_handler_test.dart
diff --git a/test/one_off_handler_test.dart b/test/one_off_handler_test.dart
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+// Copyright (c) 2015, 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:async';
+
+import 'package:shelf/shelf.dart' as shelf;
+import 'package:unittest/src/util/one_off_handler.dart';
+import 'package:unittest/unittest.dart';
+
+void main() {
+  var handler;
+  setUp(() => handler = new OneOffHandler());
+
+  _handle(request) => new Future.sync(() => handler.handler(request));
+
+  test("returns a 404 for a root URL", () {
+    var request = new shelf.Request("GET", Uri.parse("http://localhost/"));
+    return _handle(request).then((response) {
+      expect(response.statusCode, equals(404));
+    });
+  });
+
+  test("returns a 404 for an unhandled URL", () {
+    var request = new shelf.Request("GET", Uri.parse("http://localhost/1"));
+    return _handle(request).then((response) {
+      expect(response.statusCode, equals(404));
+    });
+  });
+
+  test("passes a request to a handler only once", () {
+    var path = handler.create(expectAsync((request) {
+      expect(request.method, equals("GET"));
+      return new shelf.Response.ok("good job!");
+    }));
+
+    var request = new shelf.Request("GET", Uri.parse("http://localhost/$path"));
+    return _handle(request).then((response) {
+      expect(response.statusCode, equals(200));
+      expect(response.readAsString(), completion(equals("good job!")));
+
+      request = new shelf.Request("GET", Uri.parse("http://localhost/$path"));
+      return _handle(request);
+    }).then((response) {
+      expect(response.statusCode, equals(404));
+    });
+  });
+
+  test("passes requests to the correct handlers", () {
+    var path1 = handler.create(expectAsync((request) {
+      expect(request.method, equals("GET"));
+      return new shelf.Response.ok("one");
+    }));
+
+    var path2 = handler.create(expectAsync((request) {
+      expect(request.method, equals("GET"));
+      return new shelf.Response.ok("two");
+    }));
+
+    var path3 = handler.create(expectAsync((request) {
+      expect(request.method, equals("GET"));
+      return new shelf.Response.ok("three");
+    }));
+
+    var request = new shelf.Request(
+        "GET", Uri.parse("http://localhost/$path2"));
+    return _handle(request).then((response) {
+      expect(response.statusCode, equals(200));
+      expect(response.readAsString(), completion(equals("two")));
+
+      request = new shelf.Request("GET", Uri.parse("http://localhost/$path1"));
+      return _handle(request);
+    }).then((response) {
+      expect(response.statusCode, equals(200));
+      expect(response.readAsString(), completion(equals("one")));
+
+      request = new shelf.Request("GET", Uri.parse("http://localhost/$path3"));
+      return _handle(request);
+    }).then((response) {
+      expect(response.statusCode, equals(200));
+      expect(response.readAsString(), completion(equals("three")));
+    });
+  });
+}