1 files changed, 20 insertions, 0 deletions
diff --git a/js/xpconnect/tests/unit/envChain.jsm b/js/xpconnect/tests/unit/envChain.jsm
new file mode 100644
index 0000000000..c60b032fcc
--- /dev/null
+++ b/js/xpconnect/tests/unit/envChain.jsm
@@ -0,0 +1,20 @@
+var qualified = 10;
+// NOTE: JSM cannot have unqualified name.
+let lexical = 30;
+this.prop = 40;
+
+const funcs = Cu.getJSTestingFunctions();
+const envs = [];
+let env = funcs.getInnerMostEnvironmentObject();
+while (env) {
+  envs.push({
+    type: funcs.getEnvironmentObjectType(env) || "*BackstagePass*",
+    qualified: !!Object.getOwnPropertyDescriptor(env, "qualified"),
+    prop: !!Object.getOwnPropertyDescriptor(env, "prop"),
+    lexical: !!Object.getOwnPropertyDescriptor(env, "lexical"),
+  });
+
+  env = funcs.getEnclosingEnvironmentObject(env);
+}
+
+const EXPORTED_SYMBOLS = ["envs"];