public void HasCustomPropertyReturnsTrueWhenPropertyFound()
{
const string propertyName = "SomeProp";
claimsIdentity.AddClaim(new Claim(ClaimTypePrefix.CustomProperty + propertyName, "Foo"));
claimsIdentity.AddClaim(new Claim(ClaimTypePrefix.CustomProperty + "OtherProperty", "Bar"));
Assert.IsTrue(sut.HasCustomProperty(propertyName));
}