This session looks at applying the same principles and disciplines used in other areas of system development to tame the ever increasing complexity that has arisen from the maturity of the RDBMS. To show how easy it can be to apply TDD/Unit Testing to SQL development, part of the talk will involve coding up a procedure in a test-first manner using a freely available T-SQL based test framework.

1. Test-Driven SQLTest-Driven SQL
Chris OldwoodChris Oldwood
Agile on the Beach 2014Agile on the Beach 2014
@chrisoldwood / gort@cix.co.uk@chrisoldwood / gort@cix.co.uk

2. SELECT * FROM ScopeSELECT * FROM Scope
 PreamblePreamble
 SQL Unit TestingSQL Unit Testing
 TDD by ExampleTDD by Example
 QuestionsQuestions

3. SQL Is Just Code…SQL Is Just Code…

4. ……MostlyMostly

5. SQL Unit TestingSQL Unit Testing

6. Functional TestingFunctional Testing
Tests should verify the publiclyTests should verify the publicly
observable behaviour not theobservable behaviour not the
choice of implementationchoice of implementation

7. Development SandboxDevelopment Sandbox
 IsolationIsolation
 Fast feedbackFast feedback
 DeterministicDeterministic
 ToolingTooling

8. Example TestExample Test
create procedure test._@TestSetUp@_Something
as
-- common arrangement
go
create procedure test._@Test@_Something_ShouldDoAnotherThing
as
declare @arrangement varchar(100) = 'arrangement';
declare @expected int = 42;
declare @actual int = public.ActOnArrangement();
exec ssunit.AssertIntegerEqualTo @expected, @actual;
go
exec ssunit.RunTests;

9. Example FeatureExample Feature
Produce a report showing howProduce a report showing how
many bugs each developer hasmany bugs each developer has
assigned to them.assigned to them.

10. Questions?Questions?

11. Want to Know More?Want to Know More?
BlogBlog
http://chrisoldwood.blogspot.comhttp://chrisoldwood.blogspot.com
SQL-Unit / SQL-Cop / sql2doxygenSQL-Unit / SQL-Cop / sql2doxygen
http://www.http://www.chrisoldwood.comchrisoldwood.com/sql.htm/sql.htm
http://github.com/chrisoldwoodhttp://github.com/chrisoldwood
@chrisoldwood / gort@cix.co.uk@chrisoldwood / gort@cix.co.uk