ToEventPatternTest.cs 9.3 KB

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  1. // Licensed to the .NET Foundation under one or more agreements.
  2. // The .NET Foundation licenses this file to you under the MIT License.
  3. // See the LICENSE file in the project root for more information.
  4. using System;
  5. using System.Collections.Generic;
  6. using System.Linq;
  7. using System.Reactive;
  8. using System.Reactive.Linq;
  9. using System.Reactive.Subjects;
  10. using System.Reflection;
  11. using Microsoft.Reactive.Testing;
  12. using Microsoft.VisualStudio.TestTools.UnitTesting;
  13. using Assert = Xunit.Assert;
  14. namespace ReactiveTests.Tests
  15. {
  16. [TestClass]
  17. public class ToEventPatternTest : ReactiveTest
  18. {
  19. [TestMethod]
  20. public void ToEventPattern_ArgumentChecking()
  21. {
  22. ReactiveAssert.Throws<ArgumentNullException>(() => Observable.ToEventPattern<EventArgs>(null));
  23. }
  24. [TestMethod]
  25. public void ToEventPattern_IEvent()
  26. {
  27. var src = new Subject<EventPattern<EventArgs<int>>>();
  28. var evt = src.ToEventPattern();
  29. var snd = new object();
  30. var lst = new List<int>();
  31. var hnd = new EventHandler<EventArgs<int>>((s, e) =>
  32. {
  33. Assert.Same(snd, s);
  34. lst.Add(e.Value);
  35. });
  36. evt.OnNext += hnd;
  37. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(42)));
  38. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(43)));
  39. evt.OnNext -= hnd;
  40. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(44)));
  41. Assert.True(lst.SequenceEqual([42, 43]));
  42. }
  43. [TestMethod]
  44. public void ToEventPattern_IEvent_Fails()
  45. {
  46. var src = new Subject<EventPattern<EventArgs<int>>>();
  47. var evt = src.ToEventPattern();
  48. var snd = new object();
  49. var lst = new List<int>();
  50. var hnd = new EventHandler<EventArgs<int>>((s, e) =>
  51. {
  52. Assert.Same(snd, s);
  53. lst.Add(e.Value);
  54. });
  55. evt.OnNext += hnd;
  56. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(42)));
  57. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(43)));
  58. var ex = new Exception();
  59. ReactiveAssert.Throws(ex, () => src.OnError(ex));
  60. Assert.True(lst.SequenceEqual([42, 43]));
  61. }
  62. [TestMethod]
  63. public void ToEventPattern_IEvent_Completes()
  64. {
  65. var src = new Subject<EventPattern<EventArgs<int>>>();
  66. var evt = src.ToEventPattern();
  67. var snd = new object();
  68. var lst = new List<int>();
  69. var hnd = new EventHandler<EventArgs<int>>((s, e) =>
  70. {
  71. Assert.Same(snd, s);
  72. lst.Add(e.Value);
  73. });
  74. evt.OnNext += hnd;
  75. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(42)));
  76. src.OnNext(new EventPattern<EventArgs<int>>(snd, new EventArgs<int>(43)));
  77. src.OnCompleted();
  78. Assert.True(lst.SequenceEqual([42, 43]));
  79. }
  80. private class EventSrc
  81. {
  82. public event EventHandler<EventArgs<string>> E;
  83. public void On(string s)
  84. {
  85. E?.Invoke(this, new EventArgs<string>(s));
  86. }
  87. }
  88. private class EventArgs<T> : EventArgs
  89. {
  90. public T Value { get; private set; }
  91. public EventArgs(T value)
  92. {
  93. Value = value;
  94. }
  95. }
  96. [TestMethod]
  97. public void FromEventPattern_ToEventPattern()
  98. {
  99. var src = new EventSrc();
  100. var evt = Observable.FromEventPattern<EventHandler<EventArgs<string>>, EventArgs<string>>(h => new EventHandler<EventArgs<string>>(h), h => src.E += h, h => src.E -= h);
  101. var res = evt.ToEventPattern();
  102. var lst = new List<string>();
  103. var hnd = new EventHandler<EventArgs<string>>((s, e) =>
  104. {
  105. Assert.Same(src, s);
  106. lst.Add(e.Value);
  107. });
  108. src.On("bar");
  109. res.OnNext += hnd;
  110. src.On("foo");
  111. src.On("baz");
  112. res.OnNext -= hnd;
  113. src.On("qux");
  114. Assert.True(lst.SequenceEqual(["foo", "baz"]));
  115. }
  116. [TestMethod]
  117. public void ToEvent_DuplicateHandlers()
  118. {
  119. var src = new Subject<Unit>();
  120. var evt = src.ToEvent();
  121. var num = 0;
  122. var hnd = new Action<Unit>(e => num++);
  123. evt.OnNext += hnd;
  124. Assert.Equal(0, num);
  125. src.OnNext(new Unit());
  126. Assert.Equal(1, num);
  127. evt.OnNext += hnd;
  128. src.OnNext(new Unit());
  129. Assert.Equal(3, num);
  130. evt.OnNext -= hnd;
  131. src.OnNext(new Unit());
  132. Assert.Equal(4, num);
  133. evt.OnNext -= hnd;
  134. src.OnNext(new Unit());
  135. Assert.Equal(4, num);
  136. }
  137. [TestMethod]
  138. public void ToEvent_SourceCompletes()
  139. {
  140. var src = new Subject<Unit>();
  141. var evt = src.ToEvent();
  142. var num = 0;
  143. var hnd = new Action<Unit>(e => num++);
  144. evt.OnNext += hnd;
  145. Assert.Equal(0, num);
  146. src.OnNext(new Unit());
  147. Assert.Equal(1, num);
  148. src.OnNext(new Unit());
  149. Assert.Equal(2, num);
  150. src.OnCompleted();
  151. Assert.Equal(2, num);
  152. var tbl = GetSubscriptionTable(evt);
  153. Assert.True(tbl.Count == 0);
  154. }
  155. [TestMethod]
  156. public void ToEvent_SourceFails()
  157. {
  158. var src = new Subject<Unit>();
  159. var evt = src.ToEvent();
  160. var num = 0;
  161. var hnd = new Action<Unit>(e => num++);
  162. evt.OnNext += hnd;
  163. Assert.Equal(0, num);
  164. src.OnNext(new Unit());
  165. Assert.Equal(1, num);
  166. src.OnNext(new Unit());
  167. Assert.Equal(2, num);
  168. var ex = new Exception();
  169. ReactiveAssert.Throws(ex, () => src.OnError(ex));
  170. var tbl = GetSubscriptionTable(evt);
  171. Assert.True(tbl.Count == 0);
  172. }
  173. [TestMethod]
  174. public void ToEvent_DoneImmediately()
  175. {
  176. var src = Observable.Empty<Unit>();
  177. var evt = src.ToEvent();
  178. var num = 0;
  179. var hnd = new Action<Unit>(e => num++);
  180. for (var i = 0; i < 2; i++)
  181. {
  182. evt.OnNext += hnd;
  183. Assert.Equal(0, num);
  184. var tbl = GetSubscriptionTable(evt);
  185. Assert.True(tbl.Count == 0);
  186. }
  187. }
  188. [TestMethod]
  189. public void ToEvent_UnbalancedHandlers()
  190. {
  191. var src = new Subject<Unit>();
  192. var evt = src.ToEvent();
  193. var num = 0;
  194. var hnd = new Action<Unit>(e => num++);
  195. evt.OnNext += hnd;
  196. Assert.Equal(0, num);
  197. evt.OnNext -= hnd;
  198. Assert.Equal(0, num);
  199. evt.OnNext -= hnd;
  200. Assert.Equal(0, num);
  201. evt.OnNext += hnd;
  202. Assert.Equal(0, num);
  203. src.OnNext(new Unit());
  204. Assert.Equal(1, num);
  205. src.OnNext(new Unit());
  206. Assert.Equal(2, num);
  207. evt.OnNext -= hnd;
  208. Assert.Equal(2, num);
  209. src.OnNext(new Unit());
  210. Assert.Equal(2, num);
  211. }
  212. private static Dictionary<Delegate, Stack<IDisposable>> GetSubscriptionTable(object evt)
  213. {
  214. return (Dictionary<Delegate, Stack<IDisposable>>)evt.GetType().GetField("_subscriptions", BindingFlags.NonPublic | BindingFlags.Instance).GetValue(evt);
  215. }
  216. [TestMethod]
  217. public void EventPattern_Equality()
  218. {
  219. var e1 = new EventPattern<string, EventArgs>("Bart", EventArgs.Empty);
  220. var e2 = new EventPattern<string, EventArgs>("Bart", EventArgs.Empty);
  221. Assert.True(e1.Equals(e1));
  222. Assert.True(e1.Equals(e2));
  223. Assert.True(e2.Equals(e1));
  224. Assert.True(e1 == e2);
  225. Assert.True(!(e1 != e2));
  226. Assert.True(e1.GetHashCode() == e2.GetHashCode());
  227. Assert.False(e1.Equals(null));
  228. Assert.False(e1.Equals("xy"));
  229. Assert.False(e1 == null);
  230. }
  231. [TestMethod]
  232. public void EventPattern_Inequality()
  233. {
  234. var a1 = new MyEventArgs();
  235. var a2 = new MyEventArgs();
  236. var e1 = new EventPattern<string, MyEventArgs>("Bart", a1);
  237. var e2 = new EventPattern<string, MyEventArgs>("John", a1);
  238. var e3 = new EventPattern<string, MyEventArgs>("Bart", a2);
  239. Assert.True(!e1.Equals(e2));
  240. Assert.True(!e2.Equals(e1));
  241. Assert.True(!(e1 == e2));
  242. Assert.True(e1 != e2);
  243. Assert.True(e1.GetHashCode() != e2.GetHashCode());
  244. Assert.True(!e1.Equals(e3));
  245. Assert.True(!e3.Equals(e1));
  246. Assert.True(!(e1 == e3));
  247. Assert.True(e1 != e3);
  248. Assert.True(e1.GetHashCode() != e3.GetHashCode());
  249. }
  250. private class MyEventArgs : EventArgs
  251. {
  252. }
  253. }
  254. }