public void WithWriteConcern_should_return_expected_result()
{
var originalWriteConcern = new WriteConcern(2);
var subject = new MongoClient().WithWriteConcern(originalWriteConcern);
var newWriteConcern = new WriteConcern(3);
var result = subject.WithWriteConcern(newWriteConcern);
subject.Settings.WriteConcern.Should().BeSameAs(originalWriteConcern);
result.Settings.WriteConcern.Should().BeSameAs(newWriteConcern);
result.WithWriteConcern(originalWriteConcern).Settings.Should().Be(subject.Settings);
}