Revert "unittest step 3 and 4: remove TestFramework.dart, make test.dart use"

lib/unittest/config.dart

Index: lib/unittest/config.dart
diff --git a/lib/unittest/config.dart b/lib/unittest/config.dart
index c0a2f78daddb6cc67c700d16e4233caa3121c5e7..88ecbf0765a0552f585247872723c1300cf3403e 100644
--- a/lib/unittest/config.dart
+++ b/lib/unittest/config.dart
@@ -35,12 +35,8 @@ class Configuration {
    * Called with the result of all test cases. The default implementation prints
    * the result summary using the built-in [print] command. Browser tests
    * commonly override this to reformat the output.
-   *
-   * When [uncaughtError] is not null, it contains an error that occured outside
-   * of tests (e.g. setting up the test).
    */
-  void onDone(int passed, int failed, int errors, List<TestCase> results,
-      String uncaughtError) {
+  void onDone(int passed, int failed, int errors, List<TestCase> results) {
     // Print each test's result.
     for (final t in _tests) {
       print('${t.result.toUpperCase()}: ${t.description}');
@@ -58,13 +54,10 @@ class Configuration {
       print('No tests found.');
       // This is considered a failure too: if this happens you probably have a
       // bug in your unit tests.
-    } else if (failed == 0 && errors == 0 && uncaughtError == null) {
+    } else if (failed == 0 && errors == 0) {
       print('All $passed tests passed.');
       success = true;
     } else {
-      if (uncaughtError != null) {
-        print('Top-level uncaught error: $uncaughtError');
-      }
       print('$passed PASSED, $failed FAILED, $errors ERRORS');
     }