public void TryUpdateThrowsOnNullKey()
{
// given
using (var observableDictionary = new ObservableDictionary<string, string>())
{
// when
Action action = () => observableDictionary.TryUpdate((string) null, "Null");
// then
action
.ShouldThrow<ArgumentNullException>()
.WithMessage("Value cannot be null.\r\nParameter name: key");
observableDictionary.Count.Should().Be(0);
}
}
public void TryUpdateUpdatesExistingItem()
{
// given
var initialKvPs = new List<KeyValuePair<int, string>>()
{
new KeyValuePair<int, string>(1, "One")
};
using (var observableDictionary = new ObservableDictionary<int, string>(initialKvPs))
{
// when
var updateResult = observableDictionary.TryUpdate(1, "Two");
// then
updateResult.Should().Be(true);
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain(1, "Two");
observableDictionary.Keys.Should().Contain(1);
observableDictionary.Values.Should().NotContain("One");
observableDictionary.Values.Should().Contain("Two");
}
}
public void TryUpdateDoesNotUpdateNonExistingItem()
{
// given
var initialKvPs = new List<KeyValuePair<int, string>>()
{
new KeyValuePair<int, string>(1, "One")
};
using (var observableDictionary = new ObservableDictionary<int, string>(initialKvPs))
{
// when
var updateResult = observableDictionary.TryUpdate(2, "One");
// then
updateResult.Should().Be(false);
observableDictionary.Count.Should().Be(1);
observableDictionary.Should().Contain(1, "One");
}
}