feat(index): export utility functions

Author: kwonoj

src/index.ts

@@ -1,9 +1,13 @@
 import { Observable } from 'rxjs/Observable';
+import { SubscriptionLog } from 'rxjs/testing/SubscriptionLog';
+import { parseObservableMarble } from './marbles/parseObservableMarble';
+import { parseSubscriptionMarble } from './marbles/parseSubscriptionMarble';
 import { TestMessage } from './message/TestMessage';
 import { TestScheduler } from './scheduler/TestScheduler';
 
 //workaround TS4029 by explicitly import types and avoid unused import error
 (() => Observable.toString())();
+(() => SubscriptionLog.toString())();
 
 const rxSandbox = {
   create: (autoFlush: boolean = false, frameTimeFactor: number = 1) => {
@@ -15,7 +19,10 @@ const rxSandbox = {
       flush: scheduler.flush.bind(scheduler) as typeof scheduler.flush,
       advanceBy: scheduler.advanceBy.bind(scheduler) as typeof scheduler.advanceBy,
       advanceTo: scheduler.advanceTo.bind(scheduler) as typeof scheduler.advanceTo,
-      getMarbles: scheduler.getMarbles.bind(scheduler) as typeof scheduler.getMarbles
+      getMarbles: scheduler.getMarbles.bind(scheduler) as typeof scheduler.getMarbles,
+      e: <T = string>(marble: string, value?: { [key: string]: T } | null, error?: any) =>
+        parseObservableMarble(marble, value, error, true, frameTimeFactor),
+      s: (marble: string) => parseSubscriptionMarble(marble, frameTimeFactor)
     };
   }
 };

src/marbles/parseObservableMarble.ts

@@ -18,7 +18,7 @@ const parseObservableMarble = <T>(
   error?: any,
   materializeInnerObservables: boolean = false,
   frameTimeFactor = 1
-): Array<TestMessage<T | Array<TestMessage<T>>>> => {
+): Readonly<Array<TestMessage<T | Array<TestMessage<T>>>>> => {
   if (marble.indexOf(SubscriptionMarbleToken.UNSUBSCRIBE) !== -1) {
     throw new Error(`Observable marble cannot have unsubscription marker ${SubscriptionMarbleToken.UNSUBSCRIBE}`);
   }