From f95001ffec83524391399a6c0c7ca57d9ab8987b Mon Sep 17 00:00:00 2001
From: Andrew Sliwinski <andrewsliwinski@acm.org>
Date: Mon, 17 Dec 2018 20:12:21 -0500
Subject: [PATCH] Clean-up utility module / tests

---
 lib/utility.js       |  2 +-
 test/unit/utility.js | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 test/unit/utility.js

diff --git a/lib/utility.js b/lib/utility.js
index 6ef2bb4..cb83509 100644
--- a/lib/utility.js
+++ b/lib/utility.js
@@ -3,7 +3,7 @@
  */
 class Utility {
     /**
-     * Tallys term frequency from an array of strings.
+     * Tallies term frequency from an array of strings.
      * @param  {array} input Array of strings
      * @return {object}      Frequency information
      */
diff --git a/test/unit/utility.js b/test/unit/utility.js
new file mode 100644
index 0000000..ee220bd
--- /dev/null
+++ b/test/unit/utility.js
@@ -0,0 +1,19 @@
+const test = require('tap').test;
+const utility = require('../../lib/utility');
+
+test('spec', t => {
+    t.type(utility, 'function');
+    t.type(utility.frequency, 'function');
+    t.end();
+});
+
+test('frequency', t => {
+    const input = ['foo', 'foo', 'foo', 'bar', 'bar', 'baz'];
+    const result = utility.frequency(input);
+    t.deepEqual(result, {
+        foo: 3,
+        bar: 2,
+        baz: 1
+    });
+    t.end();
+});