test(throttleTime): add tests for throttleTime operator

Partially resolves issue #666.

spec/operators/throttleTime-spec.js

@@ -0,0 +1,114 @@
+/* globals describe, it, expect, expectObservable, expectSubscription, hot, cold */
+var Rx = require('../../dist/cjs/Rx');
+var Observable = Rx.Observable;
+var Scheduler = Rx.Scheduler;
+
+describe('Observable.prototype.throttleTime()', function () {
+  it('should throttle events by 50 time units', function (done) {
+    Observable.of(1, 2, 3).throttleTime(50)
+      .subscribe(function (x) {
+        expect(x).toBe(1);
+      }, null, done);
+  });
+
+  it('should throttle events multiple times', function (done) {
+    var expected = ['1-0', '2-0'];
+    Observable.concat(
+      Observable.timer(0, 10).take(3).map(function (x) { return '1-' + x; }),
+      Observable.timer(80, 10).take(5).map(function (x) { return '2-' + x; })
+      )
+      .throttleTime(50)
+      .subscribe(function (x) {
+        expect(x).toBe(expected.shift());
+      }, null, done);
+  });
+
+  it('should simply mirror the source if values are not emitted often enough', function () {
+    var e1 =   hot('-a--------b-----c----|');
+    var subs =     '^                    !';
+    var expected = '-a--------b-----c----|';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should immediately emit the first value in each time window', function () {
+    var e1 =   hot('-a-x-y----b---x-cx---|');
+    var subs =     '^                    !';
+    var expected = '-a--------b-----c----|';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should handle a busy producer emitting a regular repeating sequence', function () {
+    var e1 =   hot('abcdefabcdefabcdefabcdefa|');
+    var subs =     '^                        !';
+    var expected = 'a-----a-----a-----a-----a|';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should complete when source does not emit', function () {
+    var e1 =   hot('-----|');
+    var subs =     '^    !';
+    var expected = '-----|';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should raise error when source does not emit and raises error', function () {
+    var e1 =   hot('-----#');
+    var expected = '-----#';
+
+    expectObservable(e1.throttleTime(10, rxTestScheduler)).toBe(expected);
+  });
+
+  it('should handle an empty source', function () {
+    var e1 =  cold('|');
+    var subs =     '(^!)';
+    var expected = '|';
+
+    expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should handle a never source', function () {
+    var e1 =  cold('-');
+    var subs =     '^';
+    var expected = '-';
+
+    expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should handle a throw source', function () {
+    var e1 =  cold('#');
+    var subs =     '(^!)';
+    var expected = '#';
+
+    expectObservable(e1.throttleTime(30, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should throttle and does not complete when source does not completes', function () {
+    var e1 =   hot('-a--(bc)-------d----------------');
+    var unsub =    '                               !';
+    var subs =     '^                              !';
+    var expected = '-a-------------d----------------';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler), unsub).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+
+  it('should throttle values until source raises error', function () {
+    var e1 =   hot('-a--(bc)-------d---------------#');
+    var subs =     '^                              !';
+    var expected = '-a-------------d---------------#';
+
+    expectObservable(e1.throttleTime(50, rxTestScheduler)).toBe(expected);
+    expectSubscriptions(e1.subscriptions).toBe(subs);
+  });
+});