@guj/rif-js/src/test/filterIf.js

Simplify filter,map and such when their use should be conditionnal

const test = require("ava");
const Rif = require("../main/rif");

test('Rifs should filter when allowed to', t => {
    const rSut = Rif
        .of([1,2,3])
        .filterIf(true)(x=>(x%2)===0);

    t.deepEqual(rSut, [2], `Since we allow the filtering, we expect the result to be filtered`);
});

test('Rifs should not filter when unallowed to', t => {
    const rSut = Rif
        .of([1,2,3])
        .filterIf(false)(x=>x*x);

    t.deepEqual(rSut, [1,2,3], `Since we forbid the filter, we expect the result to be left as is`);
});