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Building a testing culture
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Pedro Tavares
June 02, 2018
Programming
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Building a testing culture
Pedro Tavares
June 02, 2018
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Transcript
TESTING building CULTURE
https://ordepdev.me/posts/test-driven-developers
THIS IS NOT ABOUT TDD!
@ordepdev
First of all Why testing?
“It’s time for software developers to take up the mantle
of responsibility for what they produce.
Testing is the engineering rigour of software development.
Responsibility — the state or fact of being accountable or
to blame for something.
Rigour — the quality of being extremely thorough and careful.
Software Engineering
An engineering discipline that is concerned with all aspects of
software production.
MUCH MORE THAN CODING!
Types of Bad Software Projects
1. Without tests.
Zero Automated Tests.
ZERO!
Lack of professionalism?
Lack of skills?
Lack of knowledge?
Lack of time to test?
It can be all of them.
What about software quality?
Relax, we test all features with manual testing.
None
2. With Wrongly Designed Tests..
Testing is HARD.
https://twitter.com/codepipes/status/987934900111138816
Testing pitfalls: coupling.
Implementation Boundary Testing Boundary
Implementation Boundary Testing Boundary ✅ ✅ ✅ ✅ ✅ ✅
✅ ✅ ❌ ❌
Uncertainty and Doubt.
Implementation Boundary Testing Boundary ✅ ✅ ✅ ✅ ✅ ❌
❌ ❌ ❌ ❌
Testing pitfalls: performance.
Taking too much time? — that’s a no run.
Types of Testing
1. Testing after the implementation.
2. Testing during the implementation.
3. Testing that reproduce bugs.
It’s our job to build a testing culture!
But how?
5 rules.
1. Every change must have tests.
50 100 150 200 Development Unit Tests Functional Tests System
Tests Production The cost of bugs
Bugs in production are embarrassing and costly.
2. Write more than unit tests.
https://twitter.com/pwlporto/status/999258562370170880
We do not know how much an increase in coverage
can decrease the number of defects.” “
https://ordepdev.me/posts/code-coverage
Mutation testing!
def add(x,y) x + y end def add(x,y) x -
y end Source Code Mutation
Property-based testing! https://hypothesis.works/articles/quickcheck-in-every-language
http://blog.jessitron.com/2013/04/property-based-testing-what-is-it.html
Contract testing! https://martinfowler.com/bliki/ContractTest.html
https://ordepdev.me/posts/boost-your-confidence-with-consumer-driven-contracts
Model-based testing! http://mit.bme.hu/~micskeiz/pages/modelbased_testing.html
Instead of writing hundreds of test cases, write an abstract
model of the system and generate a set of test cases.” “
None
Formal methods! https://www.infoq.com/presentations/aws-testing-tla
Formal methods use mathematical proof as a complement to system
testing in order to ensure correct behavior.” “
3. Bug fixing must have tests.
Don’t repeat the same bug hunting — write a test!
4. Testing code must be reviewed.
A well-designed test suite is much easier to read, understand
and evolve.
Testing code is production code!
5. Test suites must be consistent.
L12. assertEquals(input, expectation); L35. assertEquals(expectation, input); L43. assertThat(input).isEqualTo( expectation); Assertions
L12. assertEquals(input, expectation); L35. assertEquals(expectation, input); L43. assertThat(input).isEqualTo( expectation); Assertions
L12. createEntity L35. create_withValidPayload_success L43. create_withValidPayload_shouldPersistEntity Test Methods
L12. createEntity L35. create_withValidPayload_success L43. create_withValidPayload_shouldPersistEntity Test Methods
We must share the same values, practices, and tools.
Enforce them through code reviews, static analysis, and style checking
tools.
5+1.Test suites must be visible.
A failed test is a failed build!
Wrapping up.
People who are successful at automating tasks tend to work
this way in every aspect of their jobs. It is just how they work; it is part of their culture. “ ”
Manual work is a bug. acmqueue | january-february 2018
ALWAYS BE AUTOMATING!
GO AND FIX YOUR BROKEN CULTURE!
TESTING building CULTURE @ordepdev ordepdev.me Thanks!