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Diffstat (limited to 'Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs')
-rw-r--r-- | Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs b/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs new file mode 100644 index 00000000..e9acde45 --- /dev/null +++ b/Xamarin.Forms.Core.UnitTests/NotifyCollectionChangedEventArgsExtensionsTests.cs @@ -0,0 +1,73 @@ +using System; +using System.Collections.Generic; +using System.Collections.ObjectModel; +using NUnit.Framework; + +namespace Xamarin.Forms.Core.UnitTests +{ + [TestFixture] + public class NotifyCollectionChangedEventArgsExtensionsTests : BaseTestFixture + { + [Test] + public void Add() + { + List<string> applied = new List<string> { "foo", "bar", "baz" }; + + Action reset = () => Assert.Fail ("Reset should not be called"); + Action<object, int, bool> insert = (o, i, create) => { + Assert.That (create, Is.True); + applied.Insert (i, (string) o); + }; + + Action<object, int> removeAt = (o, i) => applied.RemoveAt (i); + + var items = new ObservableCollection<string> (applied); + items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset); + + items.Add ("monkey"); + + CollectionAssert.AreEqual (items, applied); + } + + [Test] + public void Insert() + { + List<string> applied = new List<string> { "foo", "bar", "baz" }; + + Action reset = () => Assert.Fail ("Reset should not be called"); + Action<object, int, bool> insert = (o, i, create) => { + Assert.That (create, Is.True); + applied.Insert (i, (string) o); + }; + Action<object, int> removeAt = (o, i) => applied.RemoveAt (i); + + var items = new ObservableCollection<string> (applied); + items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset); + + items.Insert (1, "monkey"); + + CollectionAssert.AreEqual (items, applied); + } + + [Test] + public void Move() + { + List<string> applied = new List<string> { "foo", "bar", "baz" }; + + Action reset = () => Assert.Fail ("Reset should not be called"); + Action<object, int, bool> insert = (o, i, create) => { + Assert.That (create, Is.False); + applied.Insert (i, (string) o); + }; + + Action<object, int> removeAt = (o, i) => applied.RemoveAt (i); + + var items = new ObservableCollection<string> (applied); + items.CollectionChanged += (s, e) => e.Apply (insert, removeAt, reset); + + items.Move (0, 2); + + CollectionAssert.AreEqual (items, applied); + } + } +} |