fix(marble): initial hyphens for tomarble were missing

src/testing/Marble.ts

@@ -33,16 +33,17 @@ export function marble <T> (message: String, err: Error = new Error()): Array<IE
 }
 
 export function toMarble<T> (events: Array<IEvent>) {
-  var message = ''
-  var time = START_SUBSCRIPTION_TIME
+  let time = START_SUBSCRIPTION_TIME
+  let message = ''
+  let startCount = (events[0].time - time) / MARBLE_SIZE
+  while (startCount-- !== 0) message += '-'
+
   events.forEach(ev => {
     if (ev.time % MARBLE_SIZE !== 0)
       throw TypeError(`the time (${ev.time}) not a multiple of frame ${MARBLE_SIZE}`)
-    var count = (ev.time - time) / MARBLE_SIZE
+    let count = (ev.time - time) / MARBLE_SIZE
     time = ev.time
-    while (count-- > 1) {
-      message += '-'
-    }
+    while (count-- > 1) message += '-'
     switch (ev.type) {
       case EventType.next:
         message += (ev as EventNext<T>).value.toString()

test/test.AnimationFrame.ts

@@ -10,5 +10,5 @@ import {toMarble} from '../src/testing/Marble'
 test(t => {
   const sh = TestScheduler.of({rafTimeout: 10})
   const {results} = sh.start(() => animationFrames(), 200, 300)
-  t.is(toMarble(results), '012345678')
+  t.is(toMarble(results), '-012345678')
 })

test/test.Marble.ts

@@ -0,0 +1,24 @@
+/**
+ * Created by tushar.mathur on 02/11/16.
+ */
+
+import test from 'ava'
+import {marble, toMarble} from '../src/testing/Marble'
+import {ReactiveEvents} from '../src/testing/ReactiveEvents'
+
+test(t => {
+  const message = 'ABC|'
+  const events = marble(message)
+  const message0 = toMarble(events)
+  t.is(message, message0)
+})
+
+test(t => {
+  const message = toMarble([
+    ReactiveEvents.next(210, 'A'),
+    ReactiveEvents.next(220, 'B'),
+    ReactiveEvents.next(230, 'C'),
+    ReactiveEvents.complete(240)
+  ])
+  t.is('-ABC|', message)
+})