Added some tests

test/rearg/rearg.js

@@ -0,0 +1,8 @@
+const rearg = (fn, indexes) => (...args) =>
+fn(
+...args.reduce(
+(acc, val, i) => ((acc[indexes.indexOf(i)] = val), acc),
+Array.from({ length: indexes.length })
+)
+);
+module.exports = rearg

test/rearg/rearg.test.js

@@ -0,0 +1,13 @@
+const test = require('tape');
+const rearg = require('./rearg.js');
+
+test('Testing rearg', (t) => {
+  //For more information on all the methods supported by tape
+  //Please go to https://github.com/substack/tape
+  t.true(typeof rearg === 'function', 'rearg is a Function');
+  //t.deepEqual(rearg(args..), 'Expected');
+  //t.equal(rearg(args..), 'Expected');
+  //t.false(rearg(args..), 'Expected');
+  //t.throws(rearg(args..), 'Expected');
+  t.end();
+});