Only load a certain number of test suites at once.

test/runner/signal_test.dart

Index: test/runner/signal_test.dart
diff --git a/test/runner/signal_test.dart b/test/runner/signal_test.dart
index da5a51f183d1409e3aaafd37022c724262106f49..155b24ee5a2a8cd336825e675d045c7faa744fcf 100644
--- a/test/runner/signal_test.dart
+++ b/test/runner/signal_test.dart
@@ -86,7 +86,6 @@ void main() {
       await new Future.delayed(new Duration(seconds: 1));
       process.kill();
       await process.exitCode;
-      expect(new Directory(_tempDir).listSync(), isEmpty);

[kevmoo, 2015/06/25 03:18:31]

Why this change?

[nweiz, 2015/06/25 20:42:31]

We shouldn't have been testing this in the first place. The second time ^C is
sent, it's handled by Dart itself, without doing any additional cleanup. The
cleanup code is in a race with this signal handler to actually clean up the temp
dir, and the race went the other way with this CL.

     });
   });