Add Stopwatch.isRunning.

tests/corelib/stopwatch_test.dart

 // Copyright (c) 2012, 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.
 
 // Dart test program for testing stopwatch support.
 
 library stopwatch_test;
 
 class StopwatchTest {
   static bool checkTicking(Stopwatch sw) {
+    Expect.isFalse(sw.isRunning);
     sw.start();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 10000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > 0) {
         break;
       }
     }
     return sw.elapsedTicks > 0;
   }
 
   static bool checkStopping(Stopwatch sw) {
     sw.stop();
+    Expect.isFalse(sw.isRunning);
     int v1 = sw.elapsedTicks;
     Expect.isTrue(v1 > 0);  // Expect a non-zero elapsed time.
     Stopwatch sw2 = new Stopwatch();  // Used for verification.
     sw2.start();
+    Expect.isTrue(sw2.isRunning);
     int sw2LastElapsed = 0;
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       int v2 = sw.elapsedTicks;
       if (v1 != v2) {
         return false;
       }
       // If sw2 elapsed twice then sw must have advanced too if it wasn't
       // stopped.
       if (sw2LastElapsed > 0 && sw2.elapsedTicks > sw2LastElapsed) {
         break;
       }
       sw2LastElapsed = sw2.elapsedTicks;
     }
     // The test only makes sense if measureable time elapsed and elapsed time
     // on the stopped Stopwatch did not increase.
     Expect.isTrue(sw2.elapsedTicks > 0);
     return true;
   }
 
   static checkRestart() {
     Stopwatch sw = new Stopwatch();
+    Expect.isFalse(sw.isRunning);
     sw.start();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > 0) {
         break;
       }
     }
     sw.stop();
+    Expect.isFalse(sw.isRunning);
     int initial = sw.elapsedTicks;
     sw.start();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > initial) {
         break;
       }
     }
     sw.stop();
+    Expect.isFalse(sw.isRunning);
     Expect.isTrue(sw.elapsedTicks > initial);
   }
 
   static checkReset() {
     Stopwatch sw = new Stopwatch();
+    Expect.isFalse(sw.isRunning);
     sw.start();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > 0) {
         break;
       }
     }
     sw.stop();
+    Expect.isFalse(sw.isRunning);
     sw.reset();
+    Expect.isFalse(sw.isRunning);
     Expect.equals(0, sw.elapsedTicks);
     sw.start();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > 0) {
         break;
       }
     }
     sw.reset();
+    Expect.isTrue(sw.isRunning);
     for (int i = 0; i < 100000; i++) {
       int.parse(i.toString());
       if (sw.elapsedTicks > 0) {
         break;
       }
     }
     sw.stop();
+    Expect.isFalse(sw.isRunning);
     Expect.isTrue(sw.elapsedTicks > 0);
   }
 
   static testMain() {
     Stopwatch sw = new Stopwatch();
     Expect.isTrue(checkTicking(sw));
     Expect.isTrue(checkStopping(sw));
     checkRestart();
     checkReset();
   }
 }
 
 main() {
   StopwatchTest.testMain();
 }