browser/base/content/test/general/browser_bug431826.js


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function remote(task) {
  return SpecialPowers.spawn(gBrowser.selectedBrowser, [], task);
}

add_task(async function () {
  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser);

  let promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
  BrowserTestUtils.loadURIString(gBrowser, "https://nocert.example.com/");
  await promise;

  await remote(() => {
    // Confirm that we are displaying the contributed error page, not the default
    let uri = content.document.documentURI;
    Assert.ok(
      uri.startsWith("about:certerror"),
      "Broken page should go to about:certerror, not about:neterror"
    );
  });

  await remote(() => {
    let div = content.document.getElementById("badCertAdvancedPanel");
    // Confirm that the expert section is collapsed
    Assert.ok(div, "Advanced content div should exist");
    Assert.equal(
      div.ownerGlobal.getComputedStyle(div).display,
      "none",
      "Advanced content should not be visible by default"
    );
  });

  // Tweak the expert mode pref
  Services.prefs.setBoolPref("browser.xul.error_pages.expert_bad_cert", true);

  promise = BrowserTestUtils.waitForErrorPage(gBrowser.selectedBrowser);
  gBrowser.reload();
  await promise;

  await remote(() => {
    let div = content.document.getElementById("badCertAdvancedPanel");
    Assert.ok(div, "Advanced content div should exist");
    Assert.equal(
      div.ownerGlobal.getComputedStyle(div).display,
      "block",
      "Advanced content should be visible by default"
    );
  });

  // Clean up
  gBrowser.removeCurrentTab();
  if (
    Services.prefs.prefHasUserValue("browser.xul.error_pages.expert_bad_cert")
  ) {
    Services.prefs.clearUserPref("browser.xul.error_pages.expert_bad_cert");
  }
});