Why there are those Array tests?

[formigarafa]

rI was reading the test files and I've found these 3 tests:

• Array.reduce() -- initialValue https://github.com/Turfjs/turf/blob/master/packages/turf-meta/test.ts#L260
• Array.reduce() -- previous-coordinates https://github.com/Turfjs/turf/blob/master/packages/turf-meta/test.ts#L294
• Array.reduce() -- previous-coordinates+initialValue https://github.com/Turfjs/turf/blob/master/packages/turf-meta/test.ts#L329

They made me confused because they all iterate on an array of coordinates as if working with line geometries but they are just using the standard javascript array functions.
I can only suppose that no one was really testing the standard javascript functions and I was wondering if this was something that was supposed to be implemented in lineEach or lineReduce and was left behind.
Something like if the method lineEach was called with an array of coords it would assume these would be the line coords.

I am saying that, because as is, only one of the 3 tests use Turf functions at all.

Could anyone, explain why those tests exist? Am I missing something?