mcs/class/System/Test/System.Collections.ObjectModel/ReadOnlyObservableCollectionTest.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Authors:
  21 //      Brian O'Keefe (zer0keefie@gmail.com)
  22 //
  23
  24
  25 using System.Collections.Generic;
  26 using System.Collections.ObjectModel;
  27 using System.Collections.Specialized;
  28 using System.ComponentModel;
  29 using MonoTests.System.Collections.Specialized;
  30 using NUnit.Framework;
  31
  32 namespace MonoTests.System.Collections.ObjectModel {
  33
  34         [TestFixture]
  35         public class ReadOnlyObservableCollectionTest {
  36                 [Test]
  37                 public void ClassTest()
  38                 {
  39                         // Because the collection cannot change, check to make sure exceptions are thrown for modifications.
  40
  41                         List<char> initial = new List<char> ();
  42                         initial.Add ('A');
  43                         initial.Add ('B');
  44                         initial.Add ('C');
  45
  46                         ObservableCollection<char> collection = new ObservableCollection<char> (initial);
  47                         ReadOnlyObservableCollection<char> readOnlyCollection = new ReadOnlyObservableCollection<char> (collection);
  48
  49                         // Test the events
  50
  51                         PropertyChangedEventHandler pceh = delegate (object sender, PropertyChangedEventArgs e) {
  52                                 Assert.Fail ("No properties should change.");
  53                         };
  54
  55                         NotifyCollectionChangedEventHandler ncceh = delegate (object sender, NotifyCollectionChangedEventArgs e) {
  56                                 Assert.Fail ("The collection should not change.");
  57                         };
  58
  59                         ((INotifyPropertyChanged)readOnlyCollection).PropertyChanged += pceh;
  60
  61                         ((INotifyCollectionChanged)readOnlyCollection).CollectionChanged += ncceh;
  62
  63                         // Done with the events.
  64                         ((INotifyPropertyChanged)readOnlyCollection).PropertyChanged -= pceh;
  65
  66                         ((INotifyCollectionChanged)readOnlyCollection).CollectionChanged -= ncceh;
  67
  68                         Assert.AreEqual (3, readOnlyCollection.Count, "RO_1");
  69                         CollectionChangedEventValidators.AssertEquivalentLists (initial, readOnlyCollection, "RO_2");
  70
  71                         // Modifying the underlying collection
  72
  73                         bool propChanged = false;
  74
  75                         pceh = delegate (object sender, PropertyChangedEventArgs e) {
  76                                 propChanged = true;
  77                         };
  78
  79                         ncceh = delegate (object sender, NotifyCollectionChangedEventArgs e) {
  80                                 CollectionChangedEventValidators.ValidateAddOperation (e, new char [] { 'I' }, 3, "RO_3");
  81                         };
  82
  83                         ((INotifyPropertyChanged)readOnlyCollection).PropertyChanged += pceh;
  84
  85                         ((INotifyCollectionChanged)readOnlyCollection).CollectionChanged += ncceh;
  86
  87                         // In theory, this will cause the properties to change.
  88                         collection.Add ('I');
  89
  90                         Assert.IsTrue (propChanged, "RO_4");
  91                 }
  92         }
  93 }
  94