pkg/shelf: case-insensitive headers, cleaner Request ctor, a lot more tests

pkg/shelf/test/message_test.dart

 // Copyright (c) 2014, 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 shelf.request_test;
+library shelf.message_test;
 
 import 'dart:async';
 import 'dart:convert';
 
-import 'package:shelf/shelf.dart';
+import 'package:shelf/src/message.dart';
 import 'package:unittest/unittest.dart';
 
-Request _request([Map<String, String> headers, Stream<List<int>> body]) {
-  if (headers == null) headers = {};
-  return new Request("/", "", "GET", "", "1.1", Uri.parse('http://localhost/'),
-      headers, body: body);
+class _TestMessage extends Message {
+  _TestMessage(Map<String, String> headers, Stream<List<int>> body)
+      : super(body, headers: headers);
+}
+
+Message _createMessage({Map<String, String> headers, Stream<List<int>> body}) {
+  if (body == null) body = new Stream.fromIterable([]);
+  return new _TestMessage(headers, body);
 }
 
 void main() {
-  group("contentLength", () {
-    test("is null without a content-length header", () {
-      var request = _request();
-      expect(request.contentLength, isNull);
+  group('headers', () {
+    test('message headers are case insensitive', () {
+      var message = _createMessage(headers: {'foo': 'bar'});
+
+      expect(message.headers, containsPair('foo', 'bar'));
+      expect(message.headers, containsPair('Foo', 'bar'));
+      expect(message.headers, containsPair('FOO', 'bar'));
     });
 
-    test("comes from the content-length header", () {
-      var request = _request({
-        'content-length': '42'
-      });
-      expect(request.contentLength, 42);
+    test('null header value becomes empty, immutable', () {
+      var message = _createMessage();
+      expect(message.headers, isEmpty);
+      expect(() => message.headers['h1'] = 'value1', throwsUnsupportedError);
+    });
+
+    test('headers are immutable', () {
+      var message = _createMessage(headers: {'h1': 'value1'});
+      expect(() => message.headers['h1'] = 'value1', throwsUnsupportedError);
+      expect(() => message.headers['h1'] = 'value2', throwsUnsupportedError);
+      expect(() => message.headers['h2'] = 'value2', throwsUnsupportedError);
     });
   });
-
-  group("ifModifiedSince", () {
-    test("is null without an If-Modified-Since header", () {
-      var request = _request();
-      expect(request.ifModifiedSince, isNull);
-    });
-
-    test("comes from the Last-Modified header", () {
-      var request = _request({
-        'if-modified-since': 'Sun, 06 Nov 1994 08:49:37 GMT'
-      });
-      expect(request.ifModifiedSince,
-          equals(DateTime.parse("1994-11-06 08:49:37z")));
-    });
-  });
-
   group("readAsString", () {
     test("supports a null body", () {
-      var request = _request();
+      var request = _createMessage();
       expect(request.readAsString(), completion(equals("")));
     });
 
     test("supports a Stream<List<int>> body", () {
       var controller = new StreamController();
-      var request = _request({}, controller.stream);
+      var request = _createMessage(body: controller.stream);
       expect(request.readAsString(), completion(equals("hello, world")));
 
       controller.add([104, 101, 108, 108, 111, 44]);
       return new Future(() {
         controller
           ..add([32, 119, 111, 114, 108, 100])
           ..close();
       });
     });
 
     test("defaults to UTF-8", () {
-      var request = _request({}, new Stream.fromIterable([[195, 168]]));
+      var request = _createMessage(body: new Stream.fromIterable([[195, 168]]));
       expect(request.readAsString(), completion(equals("è")));
     });
 
     test("the content-type header overrides the default", () {
-      var request = _request({'content-type': 'text/plain; charset=iso-8859-1'},
-          new Stream.fromIterable([[195, 168]]));
+      var request = _createMessage(
+          headers: {'content-type': 'text/plain; charset=iso-8859-1'},
+          body: new Stream.fromIterable([[195, 168]]));
       expect(request.readAsString(), completion(equals("è")));
     });
 
     test("an explicit encoding overrides the content-type header", () {
-      var request = _request({'content-type': 'text/plain; charset=iso-8859-1'},
-          new Stream.fromIterable([[195, 168]]));
+      var request = _createMessage(
+          headers: {'content-type': 'text/plain; charset=iso-8859-1'},
+          body: new Stream.fromIterable([[195, 168]]));
       expect(request.readAsString(LATIN1), completion(equals("è")));
     });
   });
 
   group("read", () {
     test("supports a null body", () {
-      var request = _request();
+      var request = _createMessage();
       expect(request.read().toList(), completion(isEmpty));
     });
 
     test("supports a Stream<List<int>> body", () {
       var controller = new StreamController();
-      var request = _request({}, controller.stream);
+      var request = _createMessage(body: controller.stream);
       expect(request.read().toList(), completion(equals([
         [104, 101, 108, 108, 111, 44],
         [32, 119, 111, 114, 108, 100]
       ])));
 
       controller.add([104, 101, 108, 108, 111, 44]);
       return new Future(() {
         controller
           ..add([32, 119, 111, 114, 108, 100])
           ..close();
       });
     });
   });
 
+  group("contentLength", () {
+    test("is null without a content-length header", () {
+      var request = _createMessage();
+      expect(request.contentLength, isNull);
+    });
+
+    test("comes from the content-length header", () {
+      var request = _createMessage(headers: {
+        'content-length': '42'
+      });
+      expect(request.contentLength, 42);
+    });
+  });
+
   group("mimeType", () {
     test("is null without a content-type header", () {
-      expect(_request().mimeType, isNull);
+      expect(_createMessage().mimeType, isNull);
     });
 
     test("comes from the content-type header", () {
-      expect(_request({
+      expect(_createMessage(headers: {
         'content-type': 'text/plain'
       }).mimeType, equals('text/plain'));
     });
 
     test("doesn't include parameters", () {
-      expect(_request({
+      expect(_createMessage(headers: {
         'content-type': 'text/plain; foo=bar; bar=baz'
       }).mimeType, equals('text/plain'));
     });
   });
 
   group("encoding", () {
     test("is null without a content-type header", () {
-      expect(_request().encoding, isNull);
+      expect(_createMessage().encoding, isNull);
     });
 
     test("is null without a charset parameter", () {
-      expect(_request({
+      expect(_createMessage(headers: {
         'content-type': 'text/plain'
       }).encoding, isNull);
     });
 
     test("is null with an unrecognized charset parameter", () {
-      expect(_request({
+      expect(_createMessage(headers: {
         'content-type': 'text/plain; charset=fblthp'
       }).encoding, isNull);
     });
 
     test("comes from the content-type charset parameter", () {
-      expect(_request({
+      expect(_createMessage(headers: {
         'content-type': 'text/plain; charset=iso-8859-1'
       }).encoding, equals(LATIN1));
     });
   });
 }