chore(test): use test marbles for windowCount operator spec

spec/operators/windowCount-spec.js

@@ -1,35 +1,31 @@
-/* globals describe, it, expect */
+/* globals describe, it, expect, expectObservable, hot */
 var Rx = require('../../dist/cjs/Rx');
 var Observable = Rx.Observable;
 
 describe('Observable.prototype.windowCount', function () {
-  it('should emit windows at intervals', function (done) {
-    var expected = [
-      [0, 1],
-      [1, 2],
-      [2, 3],
-      [3]
-    ];
-    Observable.range(0, 4)
-      .windowCount(2, 1)
-      .take(3)
-      .mergeMap(function (x) { return x.toArray(); })
-      .subscribe(function (w) {
-        expect(w).toEqual(expected.shift())
-      }, null, done);
-  }, 2000);
 
-  it('should emit buffers at buffersize of intervals if not specified', function (done) {
-    var expected = [
-      [0, 1],
-      [2, 3],
-      [4, 5]
-    ];
-    Observable.range(0, 6)
-      .windowCount(2)
-      .mergeMap(function (x) { return x.toArray(); })
-      .subscribe(function (w) {
-        expect(w).toEqual(expected.shift())
-      }, null, done);
-  }, 2000);
+  function mergeMapfunction(x) { 
+    return x.toArray();
+  }
+
+  it('should emit windows at intervals', function () {
+    var e1 =   hot('--a--b--c--d--|');
+    var expected = '-----w--x--y--(z|)';
+
+    expectObservable(e1.windowCount(2,1).mergeMap(mergeMapfunction)).toBe(expected, { w: ['a', 'b'], x: ['b', 'c'], y: ['c', 'd'], z: ['d'] });
+  });
+
+  it('should emit buffers at buffersize of intervals if not specified', function () {
+    var e1 =   hot('--a--b--c--d--e--f--|');
+    var expected = '-----x-----y-----z--|';
+
+    expectObservable(e1.windowCount(2).mergeMap(mergeMapfunction)).toBe(expected, { x: ['a', 'b'], y: ['c', 'd'], z: ['e', 'f']});
+  });
+
+  it('should raises error if source raises error', function() {
+    var e1 =   hot('--a--b--c--d--e--f--#');
+    var expected = '--------w--x--y--z--#';
+
+    expectObservable(e1.windowCount(3,1).mergeMap(mergeMapfunction)).toBe(expected, { w: ['a', 'b', 'c'], x: ['b', 'c', 'd'], y: ['c', 'd', 'e'], z: ['d', 'e', 'f'] });
+  });
 });