1 files changed, 23 insertions, 0 deletions
diff --git a/testing/xpcshell/example/unit/test_add_setup.js b/testing/xpcshell/example/unit/test_add_setup.js
new file mode 100644
index 0000000000..a647f108ee
--- /dev/null
+++ b/testing/xpcshell/example/unit/test_add_setup.js
@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+let someVar = 1;
+
+add_task(() => {
+  Assert.ok(false, "I should not be called!");
+});
+
+/* eslint-disable mozilla/reject-addtask-only */
+add_task(() => {
+  Assert.equal(
+    someVar,
+    2,
+    "Setup should have run, even though this is the only test."
+  );
+}).only();
+
+add_setup(() => {
+  someVar = 2;
+});