Add tests for exposed identifiers

Author: wooorm

test.js

@@ -3,8 +3,13 @@ import test from 'node:test'
 import {h} from 'hastscript'
 import {selectAll} from 'hast-util-select'
 import {truncate} from './index.js'
+import * as mod from './index.js'
+
+test('truncate', () => {
+  const api = Object.keys(mod)
+  assert.ok(api.includes('truncate'), 'should expose `truncate`')
+  assert.equal(api.length, 1, 'should expose the public api')
 
-test('hastUtilTruncate', () => {
   assert.deepEqual(
     truncate(h('p', 'Lorem ipsum dolor sit amet'), {size: 11}),
     h('p', 'Lorem ipsum'),