Infection VS Brick\Math

consider adding mutation tests

Obviously, we can not generate mutants manually. For that purpose, there are mutation testing utilities. For PHP, we have Infection.

Infection: PHP Mutation Testing library. Plugins: roave/infection-static-analysis-plugin: Static analysis on top of mutation testing - prevents escaped mutants from being invalid according to static analysis bitexpert/captainhook-infection: Captain Hook Plugin to run InfectionPHP only against the changed files of a commit

Infection: PHP Mutation Testing library. Plugins: roave/infection-static-analysis-plugin: Static analysis on top of mutation testing - prevents escaped mutants from being invalid according to static analysis bitexpert/captainhook-infection: Captain Hook Plugin to run InfectionPHP only against the changed files of a commit

If you want to enforce testing automatically probably the best option is to rely on mutation testing, using Infection. That doesn't just check that the tests cover the code, it checks that if the code was different to what it is then the tests would (usually) fail.

IMO code coverage is a very flawed metric on its own. A high percentage doesn't guarantee that the tests actually test the right things, and it would be much more efficient if mutation testing was used (e.g. Infection). It still uses the generated code coverage reports, but only as a base for its own metrics.

For your last edit - you can also add infection which will infect your code with other values, like if you expect a positive number, it will try and inject a negative number - and see what happens - does your code break everything or something. Also it will try to inject false where you might expect a true and many many other things, and yes you will get some weird results from infection, but its a good thing to look at, and atleast check the logs and see why the infection failed at a test.

The only one that I've used is infection for PHP.

That's practically a light form of mutant testing. Have you checked Infection?

brick/math: Arbitrary-precision arithmetic library for PHP

Use strings. For PHP specifically, the Brick/Math library.

There are excellent wrappers for this like https://github.com/brick/math

https://github.com/brick/math to handle bignumber and operations

In Java and Ruby, BigDecimal is an inbuilt class that can be used. For PHP, you can checkout the Brick Math Library Basically, just find the arbitrary-precision Decimal type/Class/Library in your choice of language. Got another approach, please do let me know in comment section.

I decided to use https://github.com/brick/math and store the amount as a string in the database. My project use NANO, so that's 30 decimal points to keep. Number type column is not the choice at all.

There are many use cases where enums don't need to be backed by a scalar. I'm thinking of brick/math's RoundingMode for example: you use these in code, but never store/serialize them really.

Besides, using an arbitrary-precision library gives you an unlimited number of digits, and, in the case of brick/math, many more rounding modes to choose from. And predictable ones.