public void BeforeEach() { _lineTokenizer = new Mock <ILineTokenizer>(); var headers = new List <string> { "NAME" }; var line = new List <string> { "Bob" }; _lineTokenizer.SetupGet(x => x.Headers).Returns(headers.ToArray); _lineTokenizer.Setup(x => x.Tokenize(It.IsAny <string>())).Returns(FieldSet.Create(headers, line)); _mapper = new Mock <IFieldSetMapper <string> >(); _lineMapper = new DefaultLineMapper <string>(_lineTokenizer.Object, _mapper.Object); }