TDD for SF User Group

Transcript

1. Test Driven First Development Thinking Sai Lavu @ System Partners
2. Founder @ System Partners (Salesforce Consultancy) Like to create (code, startups) & automate things (or get Harry to do it?) 2002 Comp Sci Honours > Started working as Delphi dev > Dropped a UAT db on day 2 > Ran sub sec queries on GBs data in 2 yrs > Hacked Salesforce back when SControls existed & Apex didn’t > SP in 2008 > First 501 in APAC (I think) > 2010 helped build DataSan (queries 12+ million addresses with sub-sec search as you type response over HTTPS and offered as RESTful service) > lots of gigs in between ~ whoami
3. Sai’s Rules • Less is more. Less lines is less to read & fewer things that break. • Should have no extraneous useless info. E.g., Edited by John Doe to implement 1+1=2 on 11/11/2011; or unused code. • Write code assuming the person reading it is a homicidal maniac and knows where you live. Good way to validate that is to do peer reviews early and often. • People who push commented code to prod should join the Nightwatch and man the wall.
4. Goals for Today? • Lot of us can write great tests/test suites that are not brittle. • But a lot of us do not “think” tests & test data first. Ramblings in your head should be something like... ◦ Rather have a beer but need to build this, so let’s figure out how to test it and what’s my test data going to look like. • Your proficiency reaches another level when you can think in a language rather than just speaking it. Thinking tests first does that to your code. • Goal is not to teach you semantics of BDD or TDD. But motivate you to think firstly how to test something before building it.
5. El Problema! • You provide counselling to kids; • Kids are allocated to come and see you each month on a given date; • You cannot provide counselling to a kid more than once a month; • If that date happens to be a public holiday or a weekend then you bump it to the next working day; • If applying the above adjustment pushes it to next month then just pick the last working day in the current month - otherwise two appointments occur in the same month. Pair up; grab a pencil and paper and lets work together to write some tests.