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Unified Diff: pkg/matcher/lib/src/prints_matcher.dart

Issue 766653005: Add a [prints] matcher to the matcher library. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Code review changes Created 6 years ago
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Index: pkg/matcher/lib/src/prints_matcher.dart
diff --git a/pkg/matcher/lib/src/prints_matcher.dart b/pkg/matcher/lib/src/prints_matcher.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8faa8956abe65a7d42107ec2e467c392f0f651e9
--- /dev/null
+++ b/pkg/matcher/lib/src/prints_matcher.dart
@@ -0,0 +1,72 @@
+// 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 matcher.prints_matcher;
+
+import 'dart:async';
+
+import 'description.dart';
+import 'expect.dart';
+import 'interfaces.dart';
+import 'future_matchers.dart';
+import 'util.dart';
+
+/// Matches a [Function] that prints text that matches [matcher].
+///
+/// [matcher] may be a String or a [Matcher].
+///
+/// If the function this runs against returns a [Future], all text printed by
+/// the function (using [Zone] scoping) until that Future completes is matched.
+///
+/// This only tracks text printed using the [print] function.
+Matcher prints(matcher) => new _Prints(wrapMatcher(matcher));
+
+class _Prints extends Matcher {
+ final Matcher _matcher;
+
+ _Prints(this._matcher);
+
+ bool matches(item, Map matchState) {
+ if (item is! Function) return false;
+
+ var buffer = new StringBuffer();
+ var result = runZoned(item, zoneSpecification:
+ new ZoneSpecification(print: (_, __, ____, line) {
+ buffer.writeln(line);
+ }));
+
+ if (result is! Future) {
+ var actual = buffer.toString();
+ matchState['prints.actual'] = actual;
+ return _matcher.matches(actual, matchState);
+ }
+
+ return completes.matches(result.then(wrapAsync((_) {
+ expect(buffer.toString(), _matcher);
+ }, 'prints')), matchState);
+ }
+
+ Description describe(Description description) =>
+ description.add('prints ').addDescriptionOf(_matcher);
+
+ Description describeMismatch(item, Description description, Map matchState,
+ bool verbose) {
+ var actual = matchState.remove('prints.actual');
+ if (actual == null) return description;
+ if (actual.isEmpty) return description.add("printed nothing.");
+
+ description.add('printed ').addDescriptionOf(actual);
+
+ // Create a new description for the matcher because at least
+ // [_StringEqualsMatcher] replaces the previous contents of the description.
+ var innerMismatch = _matcher.describeMismatch(
+ actual, new StringDescription(), matchState, verbose).toString();
+
+ if (innerMismatch.isNotEmpty) {
+ description.add('\n Which: ').add(innerMismatch.toString());
+ }
+
+ return description;
+ }
+}
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