Stockholm syndrome
"Premature optimization is the root of all evil"
Donald Knuth
When testing makes no sense
Miro Svrtan
@msvrtan
When should we write tests?
High cost to fix?
Cost of fixing > cost of testing
When it brings "value"
Value = benefit - cost
Value = benefit - cost
Fallacy #1:
It makes my project more expensive
Do you charge for manual testing?
Bugs cost too
Ask for forgiveness, not permission
Fallacy #2:
It takes a lot of time
learning != using
Fallacy #3:
It takes extra time
Manual testing takes time as well
Fallacy #4:
ship PoC to production
Feature lifecycle
Phase 1: Exploration
Phase 2: Modelling/architecture
Phase 3: Development
Phase 4: Production
Fallacy #5:
100% code coverage
class User
{
...
fn isAdmin() : bool{
return value;
}
...
}Fallacy #6:
we have "tests"
Fallacy #7:
writing tests later is OK
class Customer
{
...
fn shouldChargeVat(){
if company {
return false
}
return true
}
...
}Fallacy #8:
TDD has something to do with testing
Fallacy #9:
TDD all the way
Easier onboarding
Easier to add new features
class Customer
{
...
fn shouldChargeVat(){
if company {
return false
}
return true
}
...
}class Customer
{
...
fn shouldChargeVat(){
if company {
if 'DE' == country{
return true
}else{
return false
}
}
return true
}
...
}Easier refactoring
class Customer
{
...
fn shouldChargeVat(){
if company {
if 'DE' == country{
return true
}else{
return false
}
}
return true
}
...
}class Customer
{
...
fn shouldChargeVat(){
if 'DE' == country{
return true
}
if company {
return false
}
return true
}
...
}class Customer
{
...
fn shouldChargeVat(){
if 'DE' == country{
return true
}
if company {
return false
}
return true
}
...
}class Customer
{
...
fn shouldChargeVat(){
if company {
if 'DE' == country{
return true
}else{
return false
}
}
return true
}
...
}Easier rewriting
Cleaner code
It's hard to test
shitty code
Small app
One off app
Exploration phase
Job security
Thank you!
Miro Svrtan
@msvrtan
miro (at) mirosvrtan.me
Questions?
@msvrtan
When testing makes no sense (WeAreDevs 2019)
By Miro Svrtan
When testing makes no sense (WeAreDevs 2019)
WeAreDevelopers 2019, Berlin
