test: add tests for padding util functions (#75)

* This adds tests for both the rightPad and leftPad utility function.

test/utils-test.js

@@ -0,0 +1,40 @@
+'use strict'
+
+const { test } = require('tap')
+const utils = require('../lib/utils')
+
+test('test utility functions', (t) => {
+  t.test('test rightPad function - with padding', (tt) => {
+    const padded = utils.rightPad('string', 10)
+    tt.equal(padded.length, 11, 'should have extra padding')
+    tt.equal(padded, 'string     ', 'should have padding on the right')
+
+    tt.end()
+  })
+
+  t.test('test rightPad function - withou padding', (tt) => {
+    const padded = utils.rightPad('string', 5)
+    tt.equal(padded.length, 6, 'should have the same length')
+    tt.equal(padded, 'string', 'should have no padding on the right')
+
+    tt.end()
+  })
+
+  t.test('test leftPad function - with padding', (tt) => {
+    const padded = utils.leftPad('string', 10)
+    tt.equal(padded.length, 11, 'should have extra padding')
+    tt.equal(padded, '     string', 'should have padding on the left')
+
+    tt.end()
+  })
+
+  t.test('test leftPad function - withou padding', (tt) => {
+    const padded = utils.leftPad('string', 5)
+    tt.equal(padded.length, 6, 'should have the same length')
+    tt.equal(padded, 'string', 'should have no padding on the left')
+
+    tt.end()
+  })
+
+  t.end()
+})