tweak timeout messaging; see mochajs#2294

Author: boneskull

lib/runnable.js

@@ -229,8 +229,8 @@ Runnable.prototype.resetTimeout = function () {
     if (!self._enableTimeouts) {
       return;
     }
-    self.callback(new Error('timeout! Test didn\'t complete within ' + ms +
-      '. For async tests, make sure you are calling \'done\' or that the returned Promise eventually resolves.'));
+    self.callback(new Error('Timeout of ' + ms +
+      'ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.'));
     self.timedOut = true;
   }, ms);
 };
@@ -289,8 +289,8 @@ Runnable.prototype.run = function (fn) {
     self.duration = new Date() - start;
     finished = true;
     if (!err && self.duration > ms && self._enableTimeouts) {
-      err = new Error('timeout! Test didn\'t complete within ' + ms +
-        '. For async tests, make sure you are calling \'done\' or that the returned Promise eventually resolves.');
+      err = new Error('Timeout of ' + ms +
+      'ms exceeded. For async tests and hooks, ensure "done()" is called; if returning a Promise, ensure it resolves.');
     }
     fn(err);
   }