Bugs - What are they good for

Transcript

1. 1 Bugs What are they good for?
3. What is a bug?
4. “First actual case of bug being found” Grace Hopper - 1947
5. “I did find a bug in my apparatus” Thomas Edison - 1878
6. The Crash <> Request Scale Crash Change Request ⚠
7. Let’s ship some products
8. Numbers only?
9. Nope
10. “You didn’t say you wanted to ship stuff to the Queen”
11. “Well you should know how addresses work”
12. The Crash <> Request Scale Crash Change Request ⚠
13. Record Investigate Fix
15. Reproduce It Fix It Ship It
16. Find a reproducible scenario
17. Speeds up fixing process
18. accepted Closed Won
19. paid Closed Lost
20. context 'accepted order' do let(:order) { build(:order, status: 'accepted') } it 'returns "closed won"' do expect(deal_stage(order)).to eq('closed won') end end context 'paid order' do let(:order) { build(:order, status: 'paid') } it 'returns "closed won"' do expect(deal_stage(order)).to eq('closed won') end end
21. def deal_stage(order) return 'enquired' if order.nil? return 'quoted' if order.open? return 'closed won' if order.accepted? 'closed lost' end
22. Lets you try out different solutions
23. Makes it clear what to fix
24. NoMethodError: undefined method `date’ for nil:NilClass
25. def render(order) { id: order.id, delivery_date: order.delivery.date } end
26. def render(order) { id: order.id, delivery_date: order.delivery&.date } end
27. GET /api/v1/orders?status=delivered • Order 01 • Order 02 • Order 03
28. Confidence that bug has been fixed
29. Continuous Integration Heroku Review Apps Create App Precompile Assets Create/Migrate Database Launch App Code
30. But what about actually fixing the bugs?
31. def deal_stage(order) puts "What's happening?: #{order.inspect}" return 'enquired' if order.nil? puts "What's happening?: #{order.inspect}" return 'quoted' if order.open? puts "What's happening?: #{order.inspect}" return 'closed won' if order.accepted? puts "What's happening?: #{order.inspect}" 'closed lost' end Puts Debugging
32. github.com/pry/pry def deal_stage(order) binding.pry return 'enquired' if order.nil? return 'quoted' if order.open? return 'closed won' if order.accepted? 'closed lost' end
33. Is it really the culprit? Caching Third Party Libraries Recent Changes User
34. Push Continuous Integration Deploy Revert Continuous Integration
35. Record Investigate Fix Now Depends on Urgency/Impact
36. My Latest Bug
41. Reproduce It Don’t jump to conclusions