Upgrade to the new test package.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1169883002
diff --git a/pubspec.yaml b/pubspec.yaml
index c627953..c06a60e 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -5,10 +5,10 @@
 description: >
   A platform-independent package for parsing and serializing HTTP formats.
 dependencies:
-  crypto: ">=0.9.0 <0.10.0"
+  crypto: "^0.9.0"
   collection: ">=0.9.1 <2.0.0"
   string_scanner: ">=0.0.0 <0.2.0"
 dev_dependencies:
-  unittest: ">=0.10.0 <0.12.0"
+  test: "^0.12.0"
 environment:
-  sdk: ">=1.2.0 <2.0.0"
+  sdk: ">=1.8.0 <2.0.0"
diff --git a/test/http_date_test.dart b/test/http_date_test.dart
index 303d6d7..c0a2537 100644
--- a/test/http_date_test.dart
+++ b/test/http_date_test.dart
@@ -5,7 +5,7 @@
 library http_parser.http_date_test;
 
 import 'package:http_parser/http_parser.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 void main() {
   group('format', () {
diff --git a/test/media_type_test.dart b/test/media_type_test.dart
index fe90051..0a9f904 100644
--- a/test/media_type_test.dart
+++ b/test/media_type_test.dart
@@ -5,7 +5,7 @@
 library http_parser.media_type_test;
 
 import 'package:http_parser/http_parser.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 void main() {
   group("parse", () {
diff --git a/test/web_socket_test.dart b/test/web_socket_test.dart
index 6a0849d..60934c5 100644
--- a/test/web_socket_test.dart
+++ b/test/web_socket_test.dart
@@ -7,7 +7,7 @@
 import 'dart:io';
 
 import 'package:http_parser/http_parser.dart';
-import 'package:unittest/unittest.dart';
+import 'package:test/test.dart';
 
 void main() {
   test("a client can communicate with a WebSocket server", () {