Add a string_scanner package.

pkg/string_scanner/test/string_scanner_test.dart

Index: pkg/string_scanner/test/string_scanner_test.dart
diff --git a/pkg/shelf/test/string_scanner_test.dart b/pkg/string_scanner/test/string_scanner_test.dart
similarity index 92%
copy from pkg/shelf/test/string_scanner_test.dart
copy to pkg/string_scanner/test/string_scanner_test.dart
index 4d3d259e5802361fc2ff9737345b16e8571afbe9..0cab6273ebf2e2975bf374b26b7f14574abd76f2 100644
--- a/pkg/shelf/test/string_scanner_test.dart
+++ b/pkg/string_scanner/test/string_scanner_test.dart
@@ -2,9 +2,9 @@
 // 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.string_scanner_test;
+library string_scanner.string_scanner_test;
 
-import 'package:shelf/src/string_scanner.dart';
+import 'package:string_scanner/string_scanner.dart';
 import 'package:unittest/unittest.dart';
 
 void main() {
@@ -16,6 +16,7 @@ void main() {
 
     test('is done', () {
       expect(scanner.isDone, isTrue);
+      expect(scanner.expectDone, isNot(throwsFormatException));
     });
 
     test('rest is empty', () {
@@ -37,8 +38,7 @@ void main() {
     });
 
     test("expect throws a FormatException and doesn't change the state", () {
-      expect(() => scanner.expect(new RegExp('.'), 'error'),
-          throwsFormatException);
+      expect(() => scanner.expect(new RegExp('.')), throwsFormatException);
       expect(scanner.lastMatch, isNull);
       expect(scanner.position, equals(0));
     });
@@ -70,6 +70,7 @@ void main() {
 
     test('is not done', () {
       expect(scanner.isDone, isFalse);
+      expect(scanner.expectDone, throwsFormatException);
     });
 
     test('rest is the whole string', () {
@@ -102,7 +103,7 @@ void main() {
     });
 
     test("a matching expect changes the state", () {
-      scanner.expect(new RegExp('f(..)'), 'error');
+      scanner.expect(new RegExp('f(..)'));
       expect(scanner.lastMatch[1], equals('oo'));
       expect(scanner.position, equals(3));
       expect(scanner.rest, equals(' bar'));
@@ -113,8 +114,7 @@ void main() {
       expect(scanner.matches(new RegExp('f(..)')), isTrue);
       expect(scanner.lastMatch, isNotNull);
 
-      expect(() => scanner.expect(new RegExp('b(..)'), 'error'),
-          throwsFormatException);
+      expect(() => scanner.expect(new RegExp('b(..)')), throwsFormatException);
       expect(scanner.lastMatch, isNull);
       expect(scanner.position, equals(0));
       expect(scanner.rest, equals('foo bar'));
@@ -176,6 +176,7 @@ void main() {
       expect(scanner.position, equals(7));
       expect(scanner.rest, equals(''));
       expect(scanner.isDone, isTrue);
+      expect(scanner.expectDone, isNot(throwsFormatException));
     });
   });
 
@@ -188,6 +189,7 @@ void main() {
 
     test('is done', () {
       expect(scanner.isDone, isTrue);
+      expect(scanner.expectDone, isNot(throwsFormatException));
     });
 
     test('rest is empty', () {
@@ -205,8 +207,7 @@ void main() {
     });
 
     test("expect throws a FormatException and sets lastMatch to null", () {
-      expect(() => scanner.expect(new RegExp('.'), 'error'),
-          throwsFormatException);
+      expect(() => scanner.expect(new RegExp('.')), throwsFormatException);
       expect(scanner.lastMatch, isNull);
       expect(scanner.position, equals(7));
     });