Test-Driving Your Database Adventures in relational agility @alastairs #tddatabases Who is this guy? Application developer: C# my forté, T-SQL not so much. Not “the database guy” Founder of CSCrafters The last barrier between you and your lunch  https://www.flickr.com/photos/reiterlied/15668379793/

Why Bother? Early bug notification Confidence to refactor Verifiable documentation Ok, but how does it work? https://www.flickr.com/photos/shindotv/3835365695/

Perfect is a verb Make it work, then make it right. Can apply this to our SPROCS and functions with tSQLt Unit testing framework for T-SQL Runs each test in isolation – separate SQL Server transactions Groups tests in schemas (“test classes”) for better organisation and shared setup. - Creating a test class will overwrite it if it already exists Can fake tables and views, and spy on sprocs https://www.flickr.com/photos/pmillera4/9380481028/

Recommendations DO test Sprocs Functions Triggers Views Constraints DON’T test Schema, table structure – brittle tests

SPROCS, Constraints Show me teh codez!!!11 https://www.flickr.com/photos/reiterlied/15668379793/

[Fact] public void Placing_An_Order_Adds_The_Order_To_The_Customers_Account() { // Arrange var customer = new Customer( 1, // Id "Joe", "Bloggs", // Name "10 City Road", "Staines", "Middlesex", "AB1 2CD" // Address ); var order = new Order(1, customer); // Act, Assert: not interesting for this example }

[Fact] public void Placing_An_Order_Adds_The_Order_To_The_Customers_Account() { // Arrange var customer = ACustomer() .WithGivenName("Joe") .WithFamilyName("Bloggs") .Build(); var order = new Order(1, customer); // Act, Assert: not interesting for this example } https://www.flickr.com/photos/reiterlied/15668379793/

SQL Test Data Builders Show me teh codez!!!11 https://www.flickr.com/photos/reiterlied/15668379793/

What about CI? A tsqlt runner from a guy called Christian Prieto plus a bunch of sqlcmd calls https://www.flickr.com/photos/pennstatelive/6859199341/

Questions? https://www.flickr.com/photos/uk_parliament/6546233741/