Improved error messages from unittest.

pkg/scheduled_test/test/descriptor/file_test.dart

Index: pkg/scheduled_test/test/descriptor/file_test.dart
===================================================================
--- pkg/scheduled_test/test/descriptor/file_test.dart	(revision 24041)
+++ pkg/scheduled_test/test/descriptor/file_test.dart	(working copy)
@@ -221,8 +221,8 @@
     test('test 2', () {
       expect(errors, everyElement(new isInstanceOf<ScheduleError>()));
       expect(errors.map((e) => e.error.message), equals([
-        "Expected: contains 'baaz'\n     But: was 'barfoobaz'.\n"
-        "Actual: 'barfoobaz'"
+        "Expected: contains 'baaz'\n"
+        "  Actual: 'barfoobaz'"
       ]), verbose: true);
     });
   }, passing: ['test 2']);
@@ -263,8 +263,7 @@
       expect(errors, everyElement(new isInstanceOf<ScheduleError>()));
       expect(errors.map((e) => e.error.message), equals([
         "Expected: contains <12>\n"
-        "     But: was [98, 97, 114, 102, 111, 111, 98, 97, 122].\n"
-        "Actual: [98, 97, 114, 102, 111, 111, 98, 97, 122]"
+        "  Actual: [98, 97, 114, 102, 111, 111, 98, 97, 122]"
       ]), verbose: true);
     });
   }, passing: ['test 2']);