public void SimpleGetOrAdd()
{
var dict = ImmutableDictionary <string, int>
.Empty
.Add("A", 11)
.Add("B", 22)
.Add("C", 33);
var r1 = Transactional.GetOrAdd(ref dict, "A", x => x.Length);
r1.Should().Be(11);
dict.Should().HaveCount(3);
var r2 = Transactional.GetOrAdd(ref dict, "D", x => 44);
r2.Should().Be(44);
dict.Should().HaveCount(4);
}
public void When_Dictionary_GetOrAdd_Then_FactoryIsInvokedOnlyOnce()
{
var dictionary = ImmutableDictionary <object, object> .Empty;
var invocation = 0;
Transactional.GetOrAdd(
ref dictionary,
new object(),
o =>
{
// Cause concurrency issue
if (invocation++ == 0)
{
dictionary = ImmutableDictionary <object, object> .Empty.Add(new object(), new object());
}
return(new object());
});
Assert.AreEqual(2, dictionary.Count);
Assert.AreEqual(1, invocation);
}
