Migrated tests to jest

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

test/size/size.js

@@ -1,9 +0,0 @@
-const size = val =>
-Array.isArray(val)
-? val.length
-: val && typeof val === 'object'
-? val.size || val.length || Object.keys(val).length
-: typeof val === 'string'
-? new Blob([val]).size
-: 0;
-module.exports = size;