This document provides 5 key patterns for testing: 1. Split expectations, workflows, and interactions 2. Isolate only things you completely understand when simulating 3. Make the link from test inputs to outputs obvious 4. Optimize tests for troubleshooting rather than writing tests 5. Re-organize tests to enable discovery

1. Gojko Adzic
@gojkoadzic

4. FAST
FOOD

5. FAST
FOOD
CEMENT

6. FAST
FOOD
CEMENT
BLINDER

7. FAST
FOOD
CEMENT
BLINDER
EXO
SKELETON

10. Divide
expectations,
workflows,
interactions

11. When items = …,
assert tax == ...

12. When items = …,
assert tax == ...
Add items
Authorise
Checkout

13. When items = …,
assert tax == ...
Add items
Authorise
Checkout
$('input[name=…]').val(…)
$('a[role=…]').click()

14. When items = …,
assert tax == ...
Add items
Authorise
Checkout
$('input[name=…]').val(…)
$('a[role=…]').click()
DEPENDS
ON THE
TOOL
DEPENDS
ON THE APP

19. Simulate only
things you
completely
understand

21. AVOID
MOCKING
NEVER
MOCK

25. Set accounts:
|id |name |type |credit limit |balance|stat|
|1 |XD_DIRECT |XD |10000000 |0 |O |
|2 |XD_DIRECT |XD |10000000 |0 |O |
|3 |XD_DIRECT |XD |10000000 |0 |O |
Aggregate user transactions
Check statement:
|user id |account id |name |risk |reg_date |
|187 |1 |M Smith |x1 |01.09.2009 |
Add transactions:
|txid |acct |amount |ccy |stat |tx date | gw |
|1 |1 |10 |EUR |X |01.01.2010 | G1_x |
|2 |2 |10 |EUR |X |02.01.2010 | EPAY |
Execute statement summary 07.01.2010
Check transactions:
|txid |amount |currency |stat | date |
|1 |10 |EUR |X |01.01.2010 |
|4 |10 |EUR |P |04.01.2010 |
|7 |10 |EUR |S |07.01.2010 |

26. Make the link from
inputs to outputs
obvious

29. Optimise for
troubleshooting
not for writing

31. Re-organise
for discovery

33. 5 KEY PATTERNS
1) Split expectations, workflows and interaction
2) Isolate only things you completely understand
3) Make the link from inputs to outputs obvious
4) Optimise for troubleshooting not for writing
5) Re-organise for discovery