Test cleanup and fixes [a-b]

test/nthArg/nthArg.test.js

@@ -6,9 +6,15 @@ const nthArg = require('./nthArg.js');
   expect(nthArg).toBeInstanceOf(Function);
 });
   const third = nthArg(2);
-  t.equal(third(1, 2, 3), 3, 'Returns the nth argument');
-  t.equal(third(1, 2), undefined, 'Returns undefined if arguments too few');
+  test('Returns the nth argument', () => {
+  expect(third(1, 2, 3), 3).toBe()
+});
+  test('Returns undefined if arguments too few', () => {
+  expect(third(1, 2), undefined).toBe()
+});
   const last = nthArg(-1);
-  t.equal(last(1, 2, 3, 4, 5), 5, 'Works for negative values');
+  test('Works for negative values', () => {
+  expect(last(1, 2, 3, 4, 5), 5).toBe()
+});