add attribute event listener

test/events.js

@@ -0,0 +1,43 @@
+/**
+ * Test dependencies.
+ */
+
+var tape = require('tape')
+var vomit = require('..')
+
+
+tape('should call function on event', (test) => {
+  test.plan(1)
+  var btn = vomit`<button onclick="${function() {
+    test.equal(this.outerHTML, '<button onclick="">hello</button>')
+  }}">hello</button>`
+  trigger('click', btn)
+})
+
+
+tape('should call muiltiple function on event', (test) => {
+  test.plan(1)
+  var hello = function() {
+    this.innerHTML += 'hello '
+  }
+
+  var world = function() {
+    this.innerHTML += 'world!'
+  }
+  var btn = vomit`<button onclick="${hello}${world}"></button>`
+  trigger('click', btn)
+  test.equal(btn.outerHTML, '<button onclick="">hello world!</button>')
+})
+
+/**
+ * Trigger event.
+ *
+ * @pram {String} type
+ * @param {Element} el
+ * @api private
+ */
+
+function trigger(type, el) {
+  var event = new Event(type);
+  el.dispatchEvent(event);
+}