public void ShouldUseFirstWorksheetNameWhenBuildIsCalledWithoutParams() { _excelDataProvider.Stub(x => x.GetWorksheetNames()).Return(new List <string> { "a", "b" }); _excelDataProvider.Stub(x => x.GetWorksheetFormulas("a")).Return(new Dictionary <string, string>()); var chain = _builder.Build(); _excelDataProvider.AssertWasCalled(x => x.GetWorksheetFormulas("a")); }