test: rewrite mersenne tests

[piotrekn]

Mersenne tests extracted from random.spec.ts.

[codecov]

Codecov Report

Merging #480 (7b68a88) into main (7a2a522) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #480   +/-   ##
=======================================
  Coverage   99.34%   99.34%           
=======================================
  Files        1919     1919           
  Lines      176291   176291           
  Branches      902      904    +2     
=======================================
+ Hits       175135   175136    +1     
+ Misses       1100     1099    -1     
  Partials       56       56           

Impacted Files	Coverage Δ
src/mersenne.ts	100.00% <100.00%> (ø)
src/helpers.ts	99.39% <0.00%> (-0.16%)	⬇️
src/vendor/unique.ts	97.58% <0.00%> (+1.61%)	⬆️

[ST-DDT]

The tests are a little hard to read, but IMO its good enough for now and way better than the previous tests.

Maybe change the seededRuns to

type SeededRun = {
  seed: number | number[];
  expectations: SeededRunExpectation[];
};
type SeededRunExpectations = {
  args: any[], // not sure about the type here
  expected: number,
  skip?: boolean,
};

Then you can use it like this:

const actual = mersenne.rand(...args);

expect(actual).toEqual(expected);

@Shinigami92 What do you think?

Also, IMO we should use .toBe() instead of .toEqual() as we are dealing with primitive values anyway.

[Shinigami92]

The tests are a little hard to read, but IMO its good enough for now and way better than the previous tests.

Maybe change the seededRuns to

type SeededRun = {
  seed: number | number[];
  expectations: SeededRunExpectation[];
};
type SeededRunExpectations = {
  args: any[], // not sure about the type here
  expected: number,
  skip?: boolean,
};

Then you can use it like this:

const actual = mersenne.rand(...args);

expect(actual).toEqual(expected);

@Shinigami92 What do you think?

Also, IMO we should use .toBe() instead of .toEqual() as we are dealing with primitive values anyway.

That's many suggestions / ideas and I think not directly related to this PR
Let's discuss and draft this later together in Discord