test_getMIMEInfo_pdf.js

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/* Any copyright is dedicated to the Public Domain.

http://creativecommons.org/publicdomain/zero/1.0/ */

"use strict";

XPCOMUtils.defineLazyServiceGetter(

  this,

  "gMIMEService",

  "@mozilla.org/mime;1",

  "nsIMIMEService"

);

// PDF files should always have a generic description instead

// of relying on what is registered with the Operating System.

add_task(async function test_check_unknown_mime_type() {

  const mimeService = Cc["@mozilla.org/mime;1"].getService(Ci.nsIMIMEService);

  let pdfType = mimeService.getTypeFromExtension("pdf");

  Assert.equal(pdfType, "application/pdf");

  let extension = mimeService.getPrimaryExtension("application/pdf", "");

  Assert.equal(extension, "pdf", "Expect pdf extension when given mime");

  let mimeInfo = gMIMEService.getFromTypeAndExtension("", "pdf");

  let stringBundle = Services.strings.createBundle(

    "chrome://mozapps/locale/downloads/unknownContentType.properties"

);

  Assert.equal(

    mimeInfo.description,

    stringBundle.GetStringFromName("pdfExtHandlerDescription"),

    "PDF has generic description"

);

});