Add test for transparently handling form submits

Closes #302

test/unit/pjax_fallback.js

@@ -357,4 +357,22 @@ asyncTest("POST with data string"+s, function() {
   })
 })
 
+asyncTest("handle form submit"+s, function() {
+  var frame = this.frame
+
+  frame.$(frame.document).on("submit", "form", function(event) {
+    frame.$.pjax.submit(event, "#main")
+  })
+
+  this.loaded = function() {
+    var env = JSON.parse(frame.$("#env").text())
+    var expected = {foo: "1", bar: "2"}
+    if (!disabled) expected._pjax = "#main"
+    deepEqual(env['rack.request.query_hash'], expected)
+    start()
+  }
+
+  frame.$("form").submit()
+})
+
 })

test/views/home.erb

@@ -8,6 +8,11 @@
   <li><a href="#main">Main</a></li>
 </ul>
 
+<form action="env.html" method="GET">
+  <input name="foo" value="1">
+  <input name="bar" value="2">
+</form>
+
 <div style="width:500px;height:10000px;"></div>
 
 <script type="text/javascript">window.parent.iframeLoad(window)</script>