Another update from ingydotnet^djgoku

Task/Test-a-function/00DESCRIPTION

@@ -1,2 +1,2 @@
 {{omit from|BBC BASIC}}
-Using a well known testing specific library/module/suite for your language, write some tests for your language's entry in [[Palindrome]]. If your language does not have a testing specific library well known to the language's community then state this or omit the language.
+Using a well-known testing-specific library/module/suite for your language, write some tests for your language's entry in [[Palindrome]]. If your language does not have a testing specific library well known to the language's community then state this or omit the language.

Task/Test-a-function/JavaScript/test-a-function.js

@@ -0,0 +1,24 @@
+const assert = require('assert');
+
+describe('palindrome', () => {
+  const pali = require('../lib/palindrome');
+
+  describe('.check()', () => {
+    it('should return true on encountering a palindrome', () => {
+      assert.ok(pali.check('racecar'));
+      assert.ok(pali.check('abcba'));
+      assert.ok(pali.check('aa'));
+      assert.ok(pali.check('a'));
+    });
+
+    it('should return true on encountering an empty string', () => {
+      assert.ok(pali.check(''));
+    });
+
+    it('should return false on encountering a non-palindrome', () => {
+      assert.ok(!pali.check('alice'));
+      assert.ok(!pali.check('ab'));
+      assert.ok(!pali.check('abcdba'));
+    });
+  })
+});