1 files changed, 13 insertions, 0 deletions
diff --git a/toolkit/mozapps/extensions/test/xpcshell/test_harness.js b/toolkit/mozapps/extensions/test/xpcshell/test_harness.js
new file mode 100644
index 0000000000..8be3cdcf22
--- /dev/null
+++ b/toolkit/mozapps/extensions/test/xpcshell/test_harness.js
@@ -0,0 +1,13 @@
+"use strict";
+
+// Test that the test harness is sane.
+
+// Test that the temporary directory is actually overridden in the
+// directory service.
+add_task(async function test_TmpD_override() {
+  equal(
+    FileUtils.getDir("TmpD", []).path,
+    AddonTestUtils.tempDir.path,
+    "Should get the correct temporary directory from the directory service"
+  );
+});