Steven Wright Blog

As mentioned in a previous post I've recently been working with a SQL Server unit test framework: tsqlt. I would like to share how I managed to integrate the framework and unit test into my project life-cycle. Unit tests should be treated the same as application code, meaning they should be contained within a project under source control. Being under source control will allow the tests to be maintained and changes tracked when multiple people are helping to write tests.  Also having the unit test in a project means there is a deployment mechanism out-of-the-box. The tsqlt framework has a few requirement which are as follows CLR is enabled on the SQL Server The framework and the unit test are contained within the same database of the objects which are being tested The database instance is trustworthy As unit test are required to be contained within the same database as the objects being tested, also due to the way SQL Server Data Tools (SSDT) project validation works, th

I have never been a fan of automated unit testing of SQL code mainly because previous frameworks / tools, which I came across, all seem to miss the point of SQL code which is either retrieving or manipulating data. Some of the frameworks would only test SQL scalar functions which limited code coverage. Others would test stored procedures but only the output parameter not the data being returned which limited the usefulness of the test.  The methods used to determine if a test pass or fail were also limited. As some would only check the return value; the correct number of rows were returned; a single row of data appeared in the dataset or within a row and column a value is returned. This meant that you could write code that would satisfy the test and could still be functionally incorrect as the rest of the data not checked could be inaccurate. Another problem that some of the previous frameworks forced upon you to solve was how to make the test repeatable. As data has state which is