public void WithReadPreference_should_return_expected_result()
{
var originalReadPreference = new ReadPreference(ReadPreferenceMode.Secondary);
var subject = new MongoClient().WithReadPreference(originalReadPreference);
var newReadPreference = new ReadPreference(ReadPreferenceMode.SecondaryPreferred);
var result = subject.WithReadPreference(newReadPreference);
subject.Settings.ReadPreference.Should().BeSameAs(originalReadPreference);
result.Settings.ReadPreference.Should().BeSameAs(newReadPreference);
result.WithReadPreference(originalReadPreference).Settings.Should().Be(subject.Settings);
}