1 files changed, 25 insertions, 0 deletions
diff --git a/devtools/shared/tests/unit/test_isSet.js b/devtools/shared/tests/unit/test_isSet.js
new file mode 100644
index 000000000..f85d6ae3c
--- /dev/null
+++ b/devtools/shared/tests/unit/test_isSet.js
@@ -0,0 +1,25 @@
+/* -*- js-indent-level: 2; indent-tabs-mode: nil -*- */
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+// Test ThreadSafeDevToolsUtils.isSet
+
+function run_test() {
+  const { isSet } = DevToolsUtils;
+
+  equal(isSet(new Set()), true);
+  equal(isSet(new Map()), false);
+  equal(isSet({}), false);
+  equal(isSet("I swear I'm a Set"), false);
+  equal(isSet(5), false);
+
+  const systemPrincipal = Cc["@mozilla.org/systemprincipal;1"]
+        .createInstance(Ci.nsIPrincipal);
+  const sandbox = new Cu.Sandbox(systemPrincipal);
+
+  equal(isSet(Cu.evalInSandbox("new Set()", sandbox)), true);
+  equal(isSet(Cu.evalInSandbox("new Map()", sandbox)), false);
+  equal(isSet(Cu.evalInSandbox("({})", sandbox)), false);
+  equal(isSet(Cu.evalInSandbox("'I swear I\\'m a Set'", sandbox)), false);
+  equal(isSet(Cu.evalInSandbox("5", sandbox)), false);
+}