public void WithCredentials_WhenSet_ExpectSettingsUpdated()
{
// arrange
var expected = new NetworkCredential("username", "password");
var builder = CreateHttpClientBuilder();
ICredentials actual = null;
// act
var client = builder.WithCredentials(expected).WithConfiguration(s =>
{
actual = s.Credentials;
}).Build();
// assert
actual.ShouldNotBeNull();
actual.ShouldBe(expected);
}