[core] Clean filtering.DataGrid.test.tsx

[flaviendelangle]

Closes #3518

• Unify all the column type tests with a getRows which allow to to cover more scenarios for each operator (they replace the forEach we had for some column types)

it('should filter with operator "="', () => {
  expect(getRows({ operatorValue: '=', value: 1974 })).to.deep.equal(['1974']);
  expect(getRows({ operatorValue: '=', value: 0 })).to.deep.equal(['', '0']);
  expect(getRows({ operatorValue: '=', value: undefined })).to.deep.equal(ALL_ROWS);
  expect(getRows({ operatorValue: '=', value: '' })).to.deep.equal(ALL_ROWS);
});

• Always test the nullish values for operatorValue

• Handle null value in singleSelect (they were causing crashes)

• Remove duplicated tests (sometimes we have two times the same tests for basic use-cases, especially in the string column type.

• Add TODO for filtering behavior that I find questionable

• Move filter panel tests to a standalone file (only copy paste, I did not touche those tests)

[mui-bot]

These are the results for the performance tests:

Test case	Unit	Min	Max	Median	Mean	σ
Filter 100k rows	ms	1,227.8	1,965.3	1,287	1,523.08	330.312
Sort 100k rows	ms	729.2	1,193.6	1,193.6	989.32	189.269
Select 100k rows	ms	147.8	251.3	225.3	209.26	35.902
Deselect 100k rows	ms	101.4	220.4	162.6	158.6	40.128

Generated by 🚫 dangerJS against 39095c1

[alexfauquette]

That's much clearer with this two distinct file and the getRows helper :)