gecko-dev/browser/base/content/test/general/browser_bug424101.js

/* Make sure that the context menu appears on form elements */

add_task(async function () {
  await BrowserTestUtils.openNewForegroundTab(gBrowser, "data:text/html,test");

  let contentAreaContextMenu = document.getElementById(
    "contentAreaContextMenu"
  );

  let tests = [
    { element: "input", type: "text" },
    { element: "input", type: "password" },
    { element: "input", type: "image" },
    { element: "input", type: "button" },
    { element: "input", type: "submit" },
    { element: "input", type: "reset" },
    { element: "input", type: "checkbox" },
    { element: "input", type: "radio" },
    { element: "button" },
    { element: "select" },
    { element: "option" },
    { element: "optgroup" },
  ];

  for (let index = 0; index < tests.length; index++) {
    let test = tests[index];

    await SpecialPowers.spawn(
      gBrowser.selectedBrowser,
      [{ element: test.element, type: test.type, index }],
      async function (arg) {
        let element = content.document.createElement(arg.element);
        element.id = "element" + arg.index;
        if (arg.type) {
          element.setAttribute("type", arg.type);
        }
        content.document.body.appendChild(element);
      }
    );

    let popupShownPromise = BrowserTestUtils.waitForEvent(
      contentAreaContextMenu,
      "popupshown"
    );
    await BrowserTestUtils.synthesizeMouseAtCenter(
      "#element" + index,
      { type: "contextmenu", button: 2 },
      gBrowser.selectedBrowser
    );
    await popupShownPromise;

    let typeAttr = test.type ? "type=" + test.type + " " : "";
    is(
      gContextMenu.shouldDisplay,
      true,
      "context menu behavior for <" +
        test.element +
        " " +
        typeAttr +
        "> is wrong"
    );

    let popupHiddenPromise = BrowserTestUtils.waitForEvent(
      contentAreaContextMenu,
      "popuphidden"
    );
    contentAreaContextMenu.hidePopup();
    await popupHiddenPromise;
  }

  gBrowser.removeCurrentTab();
});