5 // Jb Evain <jbevain@novell.com>
7 // Copyright (C) 2007 Novell, Inc (http://www.novell.com)
9 // Permission is hereby granted, free of charge, to any person obtaining
10 // a copy of this software and associated documentation files (the
11 // "Software"), to deal in the Software without restriction, including
12 // without limitation the rights to use, copy, modify, merge, publish,
13 // distribute, sublicense, and/or sell copies of the Software, and to
14 // permit persons to whom the Software is furnished to do so, subject to
15 // the following conditions:
17 // The above copyright notice and this permission notice shall be
18 // included in all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
30 using System.Collections;
31 using System.Collections.Generic;
34 using NUnit.Framework;
36 namespace MonoTests.System.Collections.Generic {
39 public class HashSetTest {
42 public void TestAdd ()
44 var set = new HashSet<int> ();
46 Assert.IsTrue (set.Add (1));
47 Assert.IsTrue (set.Add (2));
48 Assert.IsTrue (set.Add (3));
49 Assert.IsTrue (set.Add (4));
50 Assert.IsFalse (set.Add (4));
51 Assert.IsFalse (set.Add (3));
52 Assert.IsFalse (set.Add (2));
53 Assert.IsFalse (set.Add (1));
54 Assert.IsTrue (set.Add (0));
55 Assert.IsFalse (set.Add (0));
59 public void TestRemove ()
61 var set = new HashSet<int> ();
63 Assert.IsTrue (set.Add (1));
64 Assert.IsTrue (set.Add (2));
65 Assert.IsTrue (set.Add (3));
66 Assert.IsTrue (set.Add (4));
68 Assert.IsTrue (set.Remove (2));
69 Assert.IsTrue (set.Remove (3));
71 AssertContainsOnly (new int [] {1, 4}, set);
75 public void TestMassiveAdd ()
77 var set = new HashSet<int> ();
79 var massive = Enumerable.Range (0, 10000).ToArray ();
80 foreach (var item in massive)
81 Assert.IsTrue (set.Add (item));
83 AssertContainsOnly (massive, set);
87 public void TestMassiveRemove ()
89 var massive = Enumerable.Range (0, 10000).ToArray ();
90 var set = new HashSet<int> (massive);
92 foreach (var item in massive)
93 Assert.IsTrue (set.Remove (item));
99 [Category("TargetJvmNotWorking")]
100 public void TestCopyTo ()
102 var data = new [] {1, 2, 3, 4, 5};
103 var set = new HashSet<int> (data);
105 var array = new int [set.Count];
106 set.CopyTo (array, 0);
108 AssertContainsOnly (data, array);
112 public void TestClear ()
114 var data = new [] {1, 2, 3, 4, 5, 6};
115 var set = new HashSet<int> (data);
117 Assert.AreEqual (data.Length, set.Count);
123 public void TestContains ()
125 var data = new [] {1, 2, 3, 4, 5, 6};
126 var set = new HashSet<int> (data);
128 foreach (var item in data)
129 Assert.IsTrue (set.Contains (item));
132 [Test, ExpectedException (typeof (InvalidOperationException))]
133 public void TestModifySetWhileForeach ()
135 var set = new HashSet<int> (new [] {1, 2, 3, 4});
136 foreach (var item in set)
141 public void TestRemoveWhere ()
143 var data = new [] {1, 2, 3, 4, 5, 6, 7, 8, 9};
144 var result = new [] {2, 4, 6, 8};
146 var set = new HashSet<int> (data);
147 int removed = set.RemoveWhere (i => (i % 2) != 0);
149 Assert.AreEqual (data.Length - result.Length, removed);
150 AssertContainsOnly (result, set);
154 public void TestOverlaps ()
156 var set = new HashSet<int> (new [] {1, 2, 3, 4, 5});
158 Assert.IsTrue (set.Overlaps (new [] {0, 2}));
162 public void TestIntersectWith ()
164 var data = new [] {1, 2, 3, 4};
165 var other = new [] {2, 4, 5, 6};
166 var result = new [] {2, 4};
168 var set = new HashSet<int> (data);
170 set.IntersectWith (other);
172 AssertContainsOnly (result, set);
176 public void TestExceptWith ()
178 var data = new [] {1, 2, 3, 4, 5, 6};
179 var other = new [] {2, 4, 6};
180 var result = new [] {1, 3, 5};
181 var set = new HashSet<int> (data);
183 set.ExceptWith (other);
185 AssertContainsOnly (result, set);
189 public void TestUnionWith ()
191 var data = new [] {1, 2, 3, 4, 5, 6};
192 var other = new [] {4, 5, 6, 7, 8, 9};
193 var result = new [] {1, 2, 3, 4, 5, 6, 7, 8, 9};
195 var set = new HashSet<int> (data);
196 set.UnionWith (other);
198 AssertContainsOnly (result, set);
202 public void TestSymmetricExceptWith ()
204 var data = new [] {1, 2, 3, 4, 5};
205 var other = new [] {4, 5, 6, 7, 8, 9, 9};
206 var result = new [] {1, 2, 3, 6, 7, 8, 9};
208 var set = new HashSet<int> (data);
209 set.SymmetricExceptWith (other);
211 AssertContainsOnly (result, set);
215 public void TestEmptyHashSubsetOf ()
217 var set = new HashSet<int> ();
219 Assert.IsTrue (set.IsSubsetOf (new int [0]));
220 Assert.IsTrue (set.IsSubsetOf (new [] {1, 2}));
224 public void TestSubsetOf ()
226 var data = new [] {1, 2, 3};
227 var other = new [] {1, 2, 3, 4, 5};
228 var other2 = new [] {1, 2, 3};
229 var other3 = new [] {0, 1, 2};
231 var set = new HashSet<int> (data);
233 Assert.IsTrue (set.IsSubsetOf (other));
234 Assert.IsTrue (set.IsSubsetOf (other2));
235 Assert.IsFalse (set.IsSubsetOf (other3));
239 public void TestProperSubsetOf ()
241 var data = new [] {1, 2, 3};
242 var other = new [] {1, 2, 3, 4, 5};
243 var other2 = new [] {1, 2, 3};
244 var other3 = new [] {0, 1, 2};
246 var set = new HashSet<int> (data);
248 Assert.IsTrue (set.IsProperSubsetOf (other));
249 Assert.IsFalse (set.IsProperSubsetOf (other2));
250 Assert.IsFalse (set.IsProperSubsetOf (other3));
254 public void TestSupersetOf ()
256 var data = new [] {1, 2, 3, 4, 5};
257 var other = new [] {2, 3, 4};
258 var other2 = new [] {1, 2, 3, 4, 5};
259 var other3 = new [] {4, 5, 6};
261 var set = new HashSet<int> (data);
263 Assert.IsTrue (set.IsSupersetOf (other));
264 Assert.IsTrue (set.IsSupersetOf (other2));
265 Assert.IsFalse (set.IsSupersetOf (other3));
269 public void TestProperSupersetOf ()
271 var data = new [] {1, 2, 3, 4, 5};
272 var other = new [] {2, 3, 4};
273 var other2 = new [] {1, 2, 3, 4, 5};
274 var other3 = new [] {4, 5, 6};
276 var set = new HashSet<int> (data);
278 Assert.IsTrue (set.IsProperSupersetOf (other));
279 Assert.IsFalse (set.IsProperSupersetOf (other2));
280 Assert.IsFalse (set.IsProperSupersetOf (other3));
284 public void TestSetEquals ()
286 var data = new [] {1, 2, 3, 4};
288 var other = new [] {1, 2, 3, 4};
289 var other2 = new [] {1, 2, 2, 4};
290 var other3 = new [] {1, 2};
291 var other4 = new [] {1, 2, 3, 4, 5};
292 var other5 = new [] {1, 1, 1, 1};
294 var set = new HashSet<int> (data);
296 Assert.IsTrue (set.SetEquals (other));
297 Assert.IsFalse (set.SetEquals (other2));
298 Assert.IsFalse (set.SetEquals (other3));
299 Assert.IsFalse (set.SetEquals (other4));
300 Assert.IsFalse (set.SetEquals (other5));
304 public void TestCopyToFull ()
306 var data = new [] {1, 2, 3, 4};
308 var set = new HashSet<int> (data);
310 var res = new int [set.Count];
313 AssertContainsOnly (res, data);
317 public void TestCopyToEmpty ()
319 var set = new HashSet<int> ();
321 var res = new int [0];
326 public void TestCopyToPrecise ()
328 var set = new HashSet<int> ();
331 var dest = new int [12];
333 set.CopyTo (dest, 6, 1);
335 Assert.AreEqual (42, dest [6]);
339 public void TestICollection ()
341 var set = new HashSet<int> () as ICollection<int>;
345 Assert.AreEqual (1, set.Count);
349 public void TestHashSetEqualityComparer ()
351 var data = new string[] { "foo", "bar", "foobar" };
352 var set1 = new HashSet<string> (data, StringComparer.Ordinal);
353 var set2 = new HashSet<string> (data, StringComparer.OrdinalIgnoreCase);
355 var comparer = HashSet<string>.CreateSetComparer ();
356 Assert.IsTrue (comparer.Equals (set1, set1));
357 Assert.IsTrue (comparer.Equals (set1, set2));
358 Assert.AreEqual (comparer.GetHashCode (set1), comparer.GetHashCode (set2));
360 var set3 = new HashSet<string> (new [] { "foobar", "foo", "bar" });
361 Assert.IsTrue (comparer.Equals (set1, set3));
362 Assert.AreEqual (comparer.GetHashCode (set1), comparer.GetHashCode (set3));
364 var set4 = new HashSet<string> (new [] { "oh", "hai", "folks" });
365 Assert.IsFalse (comparer.Equals (set2, set4));
366 Assert.AreNotEqual (comparer.GetHashCode (set2), comparer.GetHashCode (set4));
368 Assert.IsTrue (comparer.Equals (null, null));
369 Assert.AreEqual (0, comparer.GetHashCode (null));
370 Assert.IsFalse (comparer.Equals (set1, null));
373 static void AssertContainsOnly<T> (IEnumerable<T> result, IEnumerable<T> data)
375 Assert.AreEqual (result.Count (), data.Count ());
377 var store = new List<T> (result);
378 foreach (var element in data) {
379 Assert.IsTrue (store.Contains (element));
380 store.Remove (element);
383 AssertIsEmpty (store);
386 static void AssertIsEmpty<T> (IEnumerable<T> source)
388 Assert.AreEqual (0, source.Count ());
404 // based on #491858, #517415
405 public void Enumerator_Current ()
407 #pragma warning disable 0168
408 var e1 = new HashSet<int>.Enumerator ();
409 Assert.IsFalse (Throws (delegate { var x = e1.Current; }));
411 var d = new HashSet<int> ();
412 var e2 = d.GetEnumerator ();
413 Assert.IsFalse (Throws (delegate { var x = e2.Current; }));
415 Assert.IsFalse (Throws (delegate { var x = e2.Current; }));
417 Assert.IsFalse (Throws (delegate { var x = e2.Current; }));
419 var e3 = ((IEnumerable<int>) d).GetEnumerator ();
420 Assert.IsFalse (Throws (delegate { var x = e3.Current; }));
422 Assert.IsFalse (Throws (delegate { var x = e3.Current; }));
424 Assert.IsFalse (Throws (delegate { var x = e3.Current; }));
426 var e4 = ((IEnumerable) d).GetEnumerator ();
427 Assert.IsTrue (Throws (delegate { var x = e4.Current; }));
429 Assert.IsTrue (Throws (delegate { var x = e4.Current; }));
430 ((IDisposable) e4).Dispose ();
431 Assert.IsTrue (Throws (delegate { var x = e4.Current; }));
432 #pragma warning restore 0168
436 public void TestNullsWithComparerThrowingException ()
438 // NOTE: We should get the same errors when using StringComparer.Ordinal on Mono 2.6.1, but the look-alike gives us more control over this test case
439 var set = new HashSet<string> (new StringComparerOrdinalLookAlike ());
440 Assert.IsTrue (set.Add (string.Empty), "#1a");
441 Assert.IsFalse (set.Contains (null), "#2a");
442 Assert.IsTrue (set.Add (null), "#2b");
443 Assert.IsTrue (set.Contains (null), "#2c");
444 Assert.AreEqual (2, set.Count, "#3");
445 Assert.IsTrue (set.Add ("a"), "#4");
446 AssertContainsOnly (new string [] { string.Empty, null, "a" }, set);
447 Assert.IsFalse (set.Add (null), "#5");
448 Assert.IsTrue (set.Add ("b"), "#6");
449 Assert.IsFalse (set.Add ("b"), "#7");
450 Assert.IsFalse (set.Add (string.Empty), "#8");
451 Assert.IsFalse (set.Add ("a"), "#9");
452 Assert.IsFalse (set.Add (null), "#10");
453 Assert.IsTrue (set.Add ("c"), "#11");
454 Assert.IsFalse (set.Add ("c"), "#12");
455 Assert.AreEqual (5, set.Count, "#13");
456 Assert.IsTrue (set.Remove (null), "#14");
457 Assert.IsTrue (set.Remove ("b"), "#15");
458 Assert.IsFalse (set.Remove (null), "#16");
459 Assert.AreEqual (3, set.Count, "#17");
460 AssertContainsOnly (new string [] { string.Empty, "a", "c" }, set);
463 private class StringComparerOrdinalLookAlike : IEqualityComparer<string>
465 public bool Equals(string x, string y)
467 return string.CompareOrdinal(x, y) == 0;
470 public int GetHashCode(string str)
473 return str.GetHashCode();
474 throw new ArgumentNullException (); // Important aspect for test (same as what StringComparer.Ordinal does, and different from GenericEqualityComparer<string>)