add a test to verify the CommonJS build

package.json

@@ -24,7 +24,7 @@
   },
   "scripts": {
     "test": "npm run dist && npm run test:ci",
-    "test:ci": "test-runner 'test/**/*.js'",
+    "test:ci": "test-runner 'test/**/*.js' 'test/**/*.cjs'",
     "docs": "jsdoc2md index.js -p list --member-index-format list > docs/API.md",
     "dist": "rollup -c"
   },

test/common-js.cjs

@@ -0,0 +1,24 @@
+const Tom = require('@test-runner/tom')
+const Table = require('table-layout')
+const assert = require('assert')
+const a = assert.strict
+
+const eol = '\n'
+const tom = new Tom()
+
+tom.test('new Table()', function () {
+  const options = {
+    maxWidth: 40,
+    padding: { left: '<', right: '>' }
+  }
+  const data = [
+    { one: 'row 1 column one .. .. ..', two: 'r1 c2' },
+    { one: 'r2 c1', two: 'row two column 2' }
+  ]
+  const table = new Table(data, options)
+
+  a.equal(table.rows.list.length, 2)
+  a.equal(table.columns.list.length, 2)
+})
+
+module.exports = tom