add string-equals to unittest, fix implementation in expect.dart

client/testing/unittest/shared.dart

Index: client/testing/unittest/shared.dart
diff --git a/client/testing/unittest/shared.dart b/client/testing/unittest/shared.dart
index c6faa4aec568a3a12b4015a75b5c607077e22458..06e08392385a16207e513c516e0aa00ee9bf3abc 100644
--- a/client/testing/unittest/shared.dart
+++ b/client/testing/unittest/shared.dart
@@ -308,6 +308,14 @@ class Expectation {
   void equalsSet(Iterable expected) {
     Expect.setEquals(expected, _value);
   }
+
+  /**
+   * Asserts that value is equivalent to [expected], assuming both are strings.
+   * When the strings differ, the error highlights the diff between them.
+   */
+  void equalsString(String expected) {

[Bob Nystrom, 2012/02/08 19:17:43]

Why don't we just make the regular equals() handle strings more intelligently?
Why have both?

[Siggi Cherem (dart-lang), 2012/02/08 19:23:51]

Done. I thought that the error message of stringEquals only included the diff. I
just checked that the output actually has the full strings too.

+    Expect.stringEquals(expected, _value);
+  }
 }
 
 /** Summarizes information about a single test case. */