public void ClearRemoveAllItems()
{
var collection = new SimpleEventCollection {
"A", "B", "C"
};
collection.Clear();
Assert.AreEqual(0, collection.Count);
Assert.IsFalse(collection.Contains("A"));
Assert.IsFalse(collection.Contains("B"));
Assert.IsFalse(collection.Contains("C"));
Assert.AreEqual(string.Empty, string.Join(string.Empty, collection));
}
public void RemoveRemovesItem()
{
var collection = new SimpleEventCollection {
"A", "B", "C"
};
Assert.IsTrue(collection.Remove("B"));
Assert.IsFalse(collection.Remove("D"));
Assert.AreEqual(2, collection.Count);
Assert.IsTrue(collection.Contains("A"));
Assert.IsFalse(collection.Contains("B"));
Assert.IsTrue(collection.Contains("C"));
Assert.AreEqual("AC", string.Join(string.Empty, collection));
}
public void CopyToCopiesItems()
{
// arrange
var collection = new SimpleEventCollection {
"A", "B", "C"
};
var array = new string[3];
// act & assert
Assert.IsFalse(collection.SequenceEqual(array));
collection.CopyTo(array, 0);
Assert.IsTrue(collection.SequenceEqual(array));
}
public void AddAddsItem()
{
var collection = new SimpleEventCollection();
collection.Add("A");
collection.Add("B");
collection.Add("C");
Assert.AreEqual(3, collection.Count);
Assert.IsTrue(collection.Contains("A"));
Assert.IsTrue(collection.Contains("B"));
Assert.IsTrue(collection.Contains("C"));
Assert.AreEqual("ABC", string.Join(string.Empty, collection));
}
public void SuccessfulClearWorks()
{
var collection = new SimpleEventCollection {
"A", "B", "C"
};
string result = string.Empty;
collection.ItemRemoving += (sender, args) => { };
collection.ItemRemoved += (sender, args) => { result += args.Item; };
collection.Clear();
Assert.AreEqual(0, collection.Count);
Assert.AreEqual("ABC", result);
}
public void ForbiddenClearFails()
{
var collection = new SimpleEventCollection {
"A", "B", "C"
};
string result = string.Empty;
collection.ItemRemoving += (sender, args) => { args.IsCanceled = args.Item == "B"; };
collection.ItemRemoved += (sender, args) => { result += args.Item; };
var error = Assert.Throws <ItemsCantBeRemovedException <string> >(() => collection.Clear());
Assert.AreEqual(3, collection.Count);
Assert.IsNullOrEmpty(result);
Assert.AreEqual("B", error.Items.Single());
}
public void AddWorksOnlyIfAllowed()
{
var collection = new SimpleEventCollection();
string result = string.Empty;
collection.ItemAdding += (sender, args) => { args.IsCanceled = args.Item == "B"; };
collection.ItemAdded += (sender, args) => { result += args.Item; };
collection.Add("A");
collection.Add("B");
collection.Add("C");
Assert.AreEqual(2, collection.Count);
Assert.IsTrue(collection.Contains("A"));
Assert.IsFalse(collection.Contains("B"));
Assert.IsTrue(collection.Contains("C"));
Assert.AreEqual("AC", result);
}
public void RemoveWorksOnlyIfAllowed()
{
var collection = new SimpleEventCollection {
"A", "B", "C"
};
string result = string.Empty;
collection.ItemRemoving += (sender, args) => { args.IsCanceled = args.Item == "B"; };
collection.ItemRemoved += (sender, args) => { result += args.Item; };
Assert.IsTrue(collection.Remove("A"));
Assert.IsFalse(collection.Remove("B"));
Assert.IsTrue(collection.Remove("C"));
Assert.AreEqual(1, collection.Count);
Assert.IsFalse(collection.Contains("A"));
Assert.IsTrue(collection.Contains("B"));
Assert.IsFalse(collection.Contains("C"));
Assert.AreEqual("AC", result);
}
