Migrated tests to jest

Used jest-codemods to migrate, will have to pass everything by hand before we can merge.

test/readFileLines/readFileLines.js

@@ -1,7 +0,0 @@
-const fs = require('fs');
-const readFileLines = filename =>
-fs
-.readFileSync(filename)
-.toString('UTF8')
-.split('\n');
-module.exports = readFileLines;