test(module): add unit test for ES module

Author: remarkablemark

test/module/index.mjs

@@ -0,0 +1,10 @@
+import assert from 'assert';
+import parse, {
+  domToReact,
+  htmlToDOM,
+  attributesToProps
+} from '../../index.mjs';
+
+[parse, domToReact, htmlToDOM, attributesToProps].forEach(func => {
+  assert.strictEqual(typeof func, 'function');
+});