Doodle-Driven Development - Ciaran McNulty

Transcript

1. Doodle Driven Development Ciaran McNulty @ Cukenfest 2019 @ciaranmcnulty | ciaran@crania.uk | #cukenfest
2. I like Draw-ers @ruby_gem @jennyjmar @mattwynne
3. Discovery ↓ ! Formulation ↓ ! Automation @ciaranmcnulty | ciaran@crania.uk | #cukenfest
4. Conversations ↓ ! Gherkin / G-W-T ↓ ! Cucumber @ciaranmcnulty | ciaran@crania.uk | #cukenfest
5. Drawings ↓ ! ? ↓ ! ? @ciaranmcnulty | ciaran@crania.uk | #cukenfest
6. ! Discovering what's important @ciaranmcnulty | ciaran@crania.uk | #cukenfest
7. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
8. Scenario: Present for full amount Given I have a pending transaction for £100 When a presentment for £100 is received Then I should have a completed transaction for £100 Scenario: Present for less than full amount Given I have a pending transaction for £100 When a presentment for £50 is received Then I should have a completed transaction for £50 And I should have a pending transaction for £50 @ciaranmcnulty | ciaran@crania.uk | #cukenfest
9. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
10. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
11. 1 picture = 1000 words Joel Goodman/M.E.N.
12. Effective discovery with drawings · Create the conditions where it can happen · Pick the right formats · Don't force it @ciaranmcnulty | ciaran@crania.uk | #cukenfest
13. ! Formulating diagrams @ciaranmcnulty | ciaran@crania.uk | #cukenfest
14. Gherkin is great: 1. Looks like the conversation 2. Trackable in VCS 3. Parseable by machines @ciaranmcnulty | ciaran@crania.uk | #cukenfest
15. Potential formats · HTML+SVG+CSS · Mermaid.js · Asciio · Asciitosvg · GraphViz @ciaranmcnulty | ciaran@crania.uk | #cukenfest
16. Graphviz digraph { "No transactions" -> "Pending £100" [label="£100 Authorisation"]; "Pending £100" -> "Completed £110" [label="£110 Presentment"]; "Pending £100" -> "Completed £50 \n Pending £50" [label="£50 Presentment"]; "Completed £50 \n Pending £50" -> "Completed £50 \n Completed £50" [label="£50 Presentment"]; "Pending £100" -> "Completed £100" [label="£100 Presentment"]; "Completed £100" -> "Completed £100 \n Completed £100" [label="£100 Presentment"]; } @ciaranmcnulty | ciaran@crania.uk | #cukenfest
17. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
18. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
19. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
20. Contextualise @ciaranmcnulty | ciaran@crania.uk | #cukenfest
21. Effective formulation · Find a format that is 'close enough' · Try and forget the tools during discovery · Sync based on mtime @ciaranmcnulty | ciaran@crania.uk | #cukenfest
22. Drawings ↓ ! Appropriate formats ↓ ! ? @ciaranmcnulty | ciaran@crania.uk | #cukenfest
23. ! Automating diagrams @ciaranmcnulty | ciaran@crania.uk | #cukenfest
24. digraph { "No transactions" -> "Pending £100" [label="£100 Authorisation"]; "Pending £100" -> "Completed £110" [label="£110 Presentment"]; "Pending £100" -> "Completed £50 \n Pending £50" [label="£50 Presentment"]; "Completed £50 \n Pending £50" -> "Completed £50 \n Completed £50" [label="£50 Presentment"]; "Pending £100" -> "Completed £100" [label="£100 Presentment"]; "Completed £100" -> "Completed £100 \n Completed £100" [label="£100 Presentment"]; } @ciaranmcnulty | ciaran@crania.uk | #cukenfest
25. foreach (file('/presentment.dot') as $line) { if (!preg_match('/->/', $line)) { continue; } $pattern = '/"(?<start>.*)".*->.*"(?<end>.*)".*label="(?<transition>.*?)"/'; if (!preg_match($pattern, $line, $matches)) { throw new Exception ("Cannot parse line:\n$line"); } $this->setUp($matches['start']); $this->applyEvent($matches['end']); $this->assertEndState($matches['transition']); } @ciaranmcnulty | ciaran@crania.uk | #cukenfest
26. Effective automation · Cheat the format · Do the easiest thing that works · Write brittle tests @ciaranmcnulty | ciaran@crania.uk | #cukenfest
27. ! Do more drawing ! Find machine formats ! Write scrappy tests @ciaranmcnulty | ciaran@crania.uk | #cukenfest
28. One more thing: Exploratory testing @ciaranmcnulty | ciaran@crania.uk | #cukenfest
29. @ciaranmcnulty | ciaran@crania.uk | #cukenfest
30. Ciaran McNulty · ciaran@crania.uk · @BDDLondon @ciaranmcnulty | ciaran@crania.uk | #cukenfest