feat(rxsandboxinstance): export scheduler instance

Author: kwonoj

src/RxSandboxInstance.ts

@@ -15,6 +15,10 @@ type expectedObservable = <T = string>(
 type expectedSubscription = (marble: string) => SubscriptionLog;
 
 type RxSandboxInstance = {
+  /**
+   * Test scheduler created for sandbox instance
+   */
+  scheduler: TestScheduler;
   /**
    * Creates a hot observable using marble diagram DSL, or TestMessage.
    */

src/index.ts

@@ -31,6 +31,7 @@ const rxSandbox: RxSandbox = {
     const scheduler = new TestScheduler(autoFlush, frameTimeFactor, maxFrameValue);
 
     return {
+      scheduler,
       hot: scheduler.createHotObservable.bind(scheduler) as typeof scheduler.createHotObservable,
       cold: scheduler.createColdObservable.bind(scheduler) as typeof scheduler.createColdObservable,
       flush: scheduler.flush.bind(scheduler) as typeof scheduler.flush,