utils: testCoverage calculation

[tunnckoCore]

This one here

opensource/@tunnckocore/utils/src/index.js

Lines 215 to 236 in 80dcb16

	const res = Object.keys(files)
	.filter((key) => key.startsWith(pkgRoot))
	.map((filename) => files[filename]);
	if (res.length > 1) {
	value = res.reduce(
	(accumulator, item) => {
	accumulator.statements += item.statements / res.length;
	accumulator.branches += item.branches / res.length;
	accumulator.functions += item.functions / res.length;
	accumulator.lines += item.lines / res.length;
	return accumulator;
	},
	{ statements: 0, branches: 0, functions: 0, lines: 0 },
	);
	}
	const cov = Object.keys(value).reduce(
	(accum, typeName) => accum + value[typeName],
	0,
	);

The other way to calc is to sum all:

item.statements + item.branches + item.functions + item.lines

and then divide it by the res.length

Still not sure. But it's probably the same, or I'm sleepy.