LCOV - code coverage report
Current view: top level - test-0.12.24+8/lib/src/frontend - prints_matcher.dart (source / functions) Hit Total Coverage
Test: coverage.lcov Lines: 0 22 0.0 %
Date: 2017-10-10 20:17:03 Functions: 0 0 -

          Line data    Source code
       1             : // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
       2             : // for details. All rights reserved. Use of this source code is governed by a
       3             : // BSD-style license that can be found in the LICENSE file.
       4             : 
       5             : import 'dart:async';
       6             : 
       7             : import 'package:matcher/matcher.dart';
       8             : 
       9             : import '../utils.dart';
      10             : import 'async_matcher.dart';
      11             : import 'expect.dart';
      12             : 
      13             : /// Matches a [Function] that prints text that matches [matcher].
      14             : ///
      15             : /// [matcher] may be a String or a [Matcher].
      16             : ///
      17             : /// If the function this runs against returns a [Future], all text printed by
      18             : /// the function (using [Zone] scoping) until that Future completes is matched.
      19             : ///
      20             : /// This only tracks text printed using the [print] function.
      21             : ///
      22             : /// This returns an [AsyncMatcher], so [expect] won't complete until the matched
      23             : /// function does.
      24           0 : Matcher prints(matcher) => new _Prints(wrapMatcher(matcher));
      25             : 
      26             : class _Prints extends AsyncMatcher {
      27             :   final Matcher _matcher;
      28             : 
      29           0 :   _Prints(this._matcher);
      30             : 
      31             :   // Avoid async/await so we synchronously fail if the function is
      32             :   // synchronous.
      33             :   /*FutureOr<String>*/ matchAsync(item) {
      34           0 :     if (item is! Function) return "was not a Function";
      35             : 
      36           0 :     var buffer = new StringBuffer();
      37           0 :     var result = runZoned(item,
      38           0 :         zoneSpecification: new ZoneSpecification(print: (_, __, ____, line) {
      39           0 :       buffer.writeln(line);
      40             :     }));
      41             : 
      42           0 :     return result is Future
      43           0 :         ? result.then((_) => _check(buffer.toString()))
      44           0 :         : _check(buffer.toString());
      45             :   }
      46             : 
      47             :   Description describe(Description description) =>
      48           0 :       description.add('prints ').addDescriptionOf(_matcher);
      49             : 
      50             :   /// Verifies that [actual] matches [_matcher] and returns a [String]
      51             :   /// description of the failure if it doesn't.
      52             :   String _check(String actual) {
      53           0 :     var matchState = {};
      54           0 :     if (_matcher.matches(actual, matchState)) return null;
      55             : 
      56           0 :     var result = _matcher
      57           0 :         .describeMismatch(actual, new StringDescription(), matchState, false)
      58           0 :         .toString();
      59             : 
      60           0 :     var buffer = new StringBuffer();
      61           0 :     if (actual.isEmpty) {
      62           0 :       buffer.writeln('printed nothing');
      63             :     } else {
      64           0 :       buffer.writeln(indent(prettyPrint(actual), first: 'printed '));
      65             :     }
      66           0 :     if (result.isNotEmpty) buffer.writeln(indent(result, first: '  which '));
      67           0 :     return buffer.toString().trimRight();
      68             :   }
      69             : }

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