Bug 1824959 - add tests for .desktop sanitization, r=NeilDeakin

Differential Revision: https://phabricator.services.mozilla.com/D173966

toolkit/components/downloads/test/unit/test_DownloadPaths.js

@@ -110,6 +110,11 @@ add_task(async function test_sanitize() {
   testSanitize("thing.local|", "thing.local.download");
   testSanitize("thing.lo|cal", "thing.lo cal");
   testSanitize('thing.local/*"', "thing.local_");
+
+  testSanitize("thing.desktoP", "thing.desktoP.download");
+  testSanitize("thing.desktoP  \n", "thing.desktoP", {
+    allowInvalidFilenames: true,
+  });
 });
 
 add_task(async function test_splitBaseNameAndExtension() {

uriloader/exthandler/tests/unit/test_filename_sanitize.js

@@ -375,4 +375,24 @@ add_task(async function validate_filename_method() {
     "filename.URL",
     "filename.URL allow invalid, sanitize only"
   );
+
+  Assert.equal(
+    mimeService.validateFileNameForSaving(
+      "filename.desktop",
+      "text/unknown",
+      mimeService.VALIDATE_SANITIZE_ONLY
+    ),
+    "filename.desktop.download",
+    "filename.desktop sanitize only"
+  );
+  Assert.equal(
+    mimeService.validateFileNameForSaving(
+      "filename.DESKTOP\n",
+      "text/unknown",
+      mimeService.VALIDATE_SANITIZE_ONLY |
+        mimeService.VALIDATE_ALLOW_INVALID_FILENAMES
+    ),
+    "filename.DESKTOP",
+    "filename.DESKTOP allow invalid, sanitize only"
+  );
 });