Bug 1393805 - Part 5 - Test that the system extensions dev dir is readable from content. r=bobowen

MozReview-Commit-ID: 7YN7S7R39CU

--HG--
extra : rebase_source : 092f1046a3f6b44c807f7632275615a6bdd674dd

security/sandbox/test/browser_content_sandbox_fs.js

@@ -405,6 +405,15 @@ async function testFileAccess() {
     });
   }
 
+  let sysExtDevDir = GetSystemExtensionsDevDir();
+  tests.push({
+    desc:     "system extensions dev dir",
+    ok:       true,
+    browser:  webBrowser,
+    file:     sysExtDevDir,
+    minLevel: 0,
+  });
+
   if (isWin()) {
     let extDir = GetPerUserExtensionDir();
     tests.push({

security/sandbox/test/browser_content_sandbox_utils.js

@@ -71,6 +71,10 @@ function GetHomeDir() {
   return (homeDir);
 }
 
+function GetSystemExtensionsDevDir() {
+  return Services.dirsvc.get("XRESysExtDev", Ci.nsIFile);
+}
+
 function GetPerUserExtensionDir() {
   return Services.dirsvc.get("XREUSysExt", Ci.nsIFile);
 }