fune/docshell/test/browser/browser_loadURI.js

/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

const gPostData = "postdata=true";

function test() {
  waitForExplicitFinish();

  let tab = (gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser));
  registerCleanupFunction(function() {
    gBrowser.removeTab(tab);
  });

  var dataStream = Cc["@mozilla.org/io/string-input-stream;1"].createInstance(
    Ci.nsIStringInputStream
  );
  dataStream.data = gPostData;

  var postStream = Cc[
    "@mozilla.org/network/mime-input-stream;1"
  ].createInstance(Ci.nsIMIMEInputStream);
  postStream.addHeader("Content-Type", "application/x-www-form-urlencoded");
  postStream.setData(dataStream);
  var systemPrincipal = Cc["@mozilla.org/systemprincipal;1"].getService(
    Ci.nsIPrincipal
  );

  tab.linkedBrowser.loadURI(
    "http://mochi.test:8888/browser/docshell/test/browser/print_postdata.sjs",
    {
      triggeringPrincipal: systemPrincipal,
      postData: postStream,
    }
  );
  BrowserTestUtils.browserLoaded(tab.linkedBrowser).then(() => {
    ContentTask.spawn(tab.linkedBrowser, gPostData, function(postData) {
      var bodyText = content.document.body.textContent;
      is(bodyText, postData, "post data was submitted correctly");
    }).then(() => {
      finish();
    });
  });
}