pkg/unittest: handling of runTests being called without any tests

pkg/unittest/lib/unittest.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * A library for writing dart unit tests.
  *
  * To import this library, install the
  * [unittest package](http://pub.dartlang.org/packages/unittest) via the pub
  * package manager. See the [Getting Started](http://pub.dartlang.org/doc)
@@ skipping 679 matching lines @@
   } else if (testFilter is RegExp) {
     filterFunction = (t) => testFilter.hasMatch(t.description);
   } else if (testFilter is Function) {
     filterFunction = testFilter;
   }
   _testCases.retainWhere(filterFunction);
 }
 
 /** Runs all queued tests, one at a time. */
 void runTests() {
+  _ensureInitialized(false);
   _currentTestCaseIndex = 0;
   _currentGroup = '';
 
   // If we are soloing a test, remove all the others.
   if (_soloTest != null) {
     filterTests((t) => t == _soloTest);
   }
 
   _config.onStart();
 
@@ skipping 88 matching lines @@
 
 String _fullSpec(String spec) {
   if (spec == null) return '$_currentGroup';
   return _currentGroup != '' ? '$_currentGroup$groupSep$spec' : spec;
 }
 
 /**
  * Lazily initializes the test library if not already initialized.
  */
 void ensureInitialized() {
+  _ensureInitialized(true);
+}
+
+void _ensureInitialized(bool configAutoStart) {
   if (_initialized) {
     return;
   }
   _initialized = true;
   // Hook our async guard into the matcher library.
   wrapAsync = (f, [id]) => expectAsync1(f, id: id);
 
   _uncaughtErrorMessage = null;
 
   if (_config == null) {
     unittestConfiguration = new Configuration();
   }
   _config.onInit();
 
-  if (_config.autoStart) {
+  if (configAutoStart && _config.autoStart) {
     // Immediately queue the suite up. It will run after a timeout (i.e. after
     // main() has returned).
     _defer(runTests);
   }
 }
 
 /** Select a solo test by ID. */
 void setSoloTest(int id) {
   for (var i = 0; i < _testCases.length; i++) {
     if (_testCases[i].id == id) {
@@ skipping 19 matching lines @@
 }
 
 /** Enable a test by ID. */
 void enableTest(int testId) => _setTestEnabledState(testId, true);
 
 /** Disable a test by ID. */
 void disableTest(int testId) => _setTestEnabledState(testId, false);
 
 /** Signature for a test function. */
 typedef dynamic TestFunction();