Unit Testing Error - The unit test adapter failed to connect to the data source or to read the data

Question

I\'m using VSTS 2K8 and I\'ve set up a Unit Test Project. In it, I have a test class with a method that does a simple assertion. I\'m using an Excel 2007 spreadsheet as my

Answer 1

I had two problems here, one was the miss-spelling of the desired sheet in my excel file. The other one and I think the important one was the difference between the .xls and .xlsx files. In my machine I have the Office 2007 so automatically the extension of excel files is .xlsx, but I was supposed to write a test case for a project that has been already implemented and it was using this DataSource:

[DataSource("System.Data.Odbc",
            @"Driver={Microsoft Excel Driver (*.xls)};DriverId=790;Dbq=Test.xls;DefaultDir=.",
            "Data$", DataAccessMethod.Sequential)]

I created an excel file in a machine that had the Office version before 2007 so the extension was .xls and then I moved this excel file to my machine. This way I could solve my problem.

Answer 2

I had a similar problem but was just trying to deploy a simple XML file.

The problem turned out to be the filename of the file I was deploying was too long.

Answer 3

Solutions that I tried 1) Added data file in deployment section of local settings 2) Changed the properties of the file to "Content" and "Copy if newer" 3) Hard-coding the location of the file in deployment item attribute and in the connection string in app.config file.

None of the above worked.

Eventually I found out that the registry did not have the Jet dlls registers. I exported the Jet folder(HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Jet) from the registry of a machine on which I was not getting the error and imported that on to the machine I was getting the error. This resolved the issue for me.

Answer 4

Change the "Build Action" property of Excel(.xlsx) to Content and "Copy to Output Directory" to Copy if newer.

This worked for me when I got the same error as urs...

++ also dont forget to browse and add the excel file in Deployment tab of TestRun.config file that is in the server soution..:)

Answer 5

You should make sure your deployment is enabled in your test settings you have chosen!!!

Good luck!!!

Answer 6

The Sheet Name should have a '$' appended otherwise it will definitely fail (still valid for Visual Studio 2015) like: "Sheet1$".