Index: pkg/unittest/lib/src/string_matchers.dart |
diff --git a/pkg/unittest/lib/src/string_matchers.dart b/pkg/unittest/lib/src/string_matchers.dart |
index 7f04a0cd431f2e719cc3c22169f87ebff59d8ed3..933d0a091b8288c5acdb6ccd4c699d56e7991663 100644 |
--- a/pkg/unittest/lib/src/string_matchers.dart |
+++ b/pkg/unittest/lib/src/string_matchers.dart |
@@ -74,11 +74,11 @@ String collapseWhitespace(_string) { |
var character = _string[i]; |
if (isWhitespace(character)) { |
if (!skipSpace) { |
- result.add(' '); |
+ result.write(' '); |
skipSpace = true; |
} |
} else { |
- result.add(character); |
+ result.write(character); |
skipSpace = false; |
} |
} |