public void ChangeStream_should_throw_when_pipeline_is_null()
{
PipelineDefinition <BsonDocument, BsonDocument> pipeline = null;
ChangeStreamStageOptions options = null;
var exception = Record.Exception(() => pipeline.ChangeStream(options));
var argumentNullException = exception.Should().BeOfType <ArgumentNullException>().Subject;
argumentNullException.ParamName.Should().Be("pipeline");
}