Test migration to jest by hand

Apparently using regular expressions is way easier.

test/rearg/rearg.test.js

@@ -0,0 +1,16 @@
+const expect = require('expect');
+const rearg = require('./rearg.js');
+
+
+  test('rearg is a Function', () => {
+  expect(rearg).toBeInstanceOf(Function);
+});
+  var rearged = rearg(
+    function(a, b, c) {
+      return [a, b, c];
+    },
+    [2, 0, 1]
+  );
+  t.deepEqual(rearged('b', 'c', 'a'), ['a', 'b', 'c'], 'Reorders arguments in invoked function');
+  
+