1 files changed, 30 insertions, 0 deletions
diff --git a/uriloader/exthandler/tests/unit/test_getMIMEInfo_pdf.js b/uriloader/exthandler/tests/unit/test_getMIMEInfo_pdf.js
new file mode 100644
index 0000000000..03b0cea25e
--- /dev/null
+++ b/uriloader/exthandler/tests/unit/test_getMIMEInfo_pdf.js
@@ -0,0 +1,30 @@
+/* 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"
+  );
+});