Convert shelf to use the string_scanner package.

pkg/string_scanner/test/error_format_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 string_scanner.error_format_test;
-
-import 'package:string_scanner/string_scanner.dart';
-import 'package:unittest/unittest.dart';
-
-void main() {
-  test('points to the first unconsumed character', () {
-    var scanner = new StringScanner('foo bar baz');
-    scanner.expect('foo ');
-    expect(() => scanner.expect('foo'), throwsFormattedError('''
-Expected "foo" on line 1, column 5.
-foo bar baz
-    ^'''));
-  });
-
-  test('prints the correct line', () {
-    var scanner = new StringScanner('foo bar baz\ndo re mi\nearth fire water');
-    scanner.expect('foo bar baz\ndo ');
-    expect(() => scanner.expect('foo'), throwsFormattedError('''
-Expected "foo" on line 2, column 4.
-do re mi
-   ^'''));
-  });
-
-  test('handles the beginning of the string correctly', () {
-    var scanner = new StringScanner('foo bar baz');
-    expect(() => scanner.expect('zap'), throwsFormattedError('''
-Expected "zap" on line 1, column 1.
-foo bar baz
-^'''));
-  });
-
-  test('handles the end of the string correctly', () {
-    var scanner = new StringScanner('foo bar baz');
-    scanner.expect('foo bar baz');
-    expect(() => scanner.expect('bang'), throwsFormattedError('''
-Expected "bang" on line 1, column 12.
-foo bar baz
-           ^'''));
-  });
-
-  test('handles an empty string correctly', () {
-    expect(() => new StringScanner('').expect('foo'), throwsFormattedError('''
-Expected "foo" on line 1, column 1.
-
-^'''));
-  });
-
-  group("expected name", () {
-    test("uses the provided name", () {
-      expect(() => new StringScanner('').expect('foo bar', name: 'zap'),
-          throwsFormattedError('''
-Expected zap on line 1, column 1.
-
-^'''));
-    });
-
-    test("escapes string quotes", () {
-      expect(() => new StringScanner('').expect('foo"bar'),
-          throwsFormattedError('''
-Expected "foo\\"bar" on line 1, column 1.
-
-^'''));
-    });
-
-    test("escapes string backslashes", () {
-      expect(() => new StringScanner('').expect('foo\\bar'),
-          throwsFormattedError('''
-Expected "foo\\\\bar" on line 1, column 1.
-
-^'''));
-    });
-
-    test("prints PERL-style regexps", () {
-      expect(() => new StringScanner('').expect(new RegExp(r'foo')),
-          throwsFormattedError('''
-Expected /foo/ on line 1, column 1.
-
-^'''));
-    });
-
-    test("escape regexp forward slashes", () {
-      expect(() => new StringScanner('').expect(new RegExp(r'foo/bar')),
-          throwsFormattedError('''
-Expected /foo\\/bar/ on line 1, column 1.
-
-^'''));
-    });
-
-    test("does not escape regexp backslashes", () {
-      expect(() => new StringScanner('').expect(new RegExp(r'foo\bar')),
-          throwsFormattedError('''
-Expected /foo\\bar/ on line 1, column 1.
-
-^'''));
-    });
-  });
-}
-
-Matcher throwsFormattedError(String format) {
-  return throwsA(predicate((error) {
-    expect(error, isFormatException);
-    expect(error.message, equals(format));
-    return true;
-  }));
-}