1 files changed, 22 insertions, 0 deletions
diff --git a/Libraries/LibJS/Tests/strict-mode-blocks.js b/Libraries/LibJS/Tests/strict-mode-blocks.js
new file mode 100644
index 0000000000..c1fe1a7d24
--- /dev/null
+++ b/Libraries/LibJS/Tests/strict-mode-blocks.js
@@ -0,0 +1,22 @@
+test("Issue #3641, strict mode should be function- or program-level, not block-level", () => {
+    function func() {
+        expect(isStrictMode()).toBeFalse();
+
+        {
+            "use strict";
+            expect(isStrictMode()).toBeFalse();
+        }
+
+        if (true) {
+            "use strict";
+            expect(isStrictMode()).toBeFalse();
+        }
+
+        do {
+            "use strict";
+            expect(isStrictMode()).toBeFalse();
+        } while (false);
+    }
+
+    func();
+});