public void AsReadOnly_Returns_List_With_Same_Items()
{
var items = new List <int> {
4, 8, 15, 16, 23, 42
};
// Use as a static method, because full .NET already has a AsReadOnly instance method
var result = XList.AsReadOnly(items);
result.Should().Equal(items);
}
public void AsReadOnly_Returns_A_List_That_Throws_On_Attempt_To_Modify()
{
var items = new List <int> {
4, 8, 15, 16, 23, 42
};
// Call as a static method, because full .NET already has a AsReadOnly instance method which would be used instead
IList <int> result = XList.AsReadOnly(items);
Assert.Throws <NotSupportedException>(result.Clear);
Assert.Throws <NotSupportedException>(() => result.Add(99));
Assert.Throws <NotSupportedException>(() => result.Insert(1, 99));
Assert.Throws <NotSupportedException>(() => result.RemoveAt(0));
Assert.Throws <NotSupportedException>(() => result.Remove(42));
Assert.Throws <NotSupportedException>(() => result[0] = 99);
}
public void AsReadOnly_Returns_A_List_That_Reflects_Changes_In_The_Original_List()
{
var items = new List <int> {
4, 8, 15, 16, 23, 42
};
// Use as a static method, because full .NET already has a AsReadOnly instance method
var result = XList.AsReadOnly(items);
// Make some random changes in the original list
items.Remove(16);
items.RemoveAt(1);
items.Add(99);
items.Swap(2, 3);
// The read-only collection is only a view of the original, it should reflect the changes
result.Should().Equal(items);
}
