Who am I
Mutants vs Properties
- How to verify quality of your tests?
- Change our code and see what happens
- A lot of data
What do we expect from tests?
Mutate
Run tests
Analyze
Mutation testing
Mutants
- arithmetic operations
- boolean literals
- removal mutators
- Linq mutations
Life of mutants
- Killed
- Survived
- No coverage
Stryker .Net
Mutants, I don't hate them.
I just know what they can do.
How to do it?
Install Stryker from dotnet tools
run dotnet stryker
Profit $$
Running stryker
- Easy to find uncovered cases
- Different way to look at tests
- Slow
- Can't run it on solution
- Not many mutators yet
-
A lot of noise, has to be configured
Property Based Testing
What is it?
A lot of unit tests at once
Shrinking
The thing that QuickCheck does
How to do it?
You have to write some code
Learn FsCheck syntax
- Tests a lot of data points
- Random values can find bugs
- Tests a lot of data points
- Random values can find bugs
- Require different mindset
- Unpopular
- Async