1 files changed, 15 insertions, 0 deletions
diff --git a/Userland/Libraries/LibJS/Tests/strict-mode-errors.js b/Userland/Libraries/LibJS/Tests/strict-mode-errors.js
new file mode 100644
index 0000000000..ada52e359f
--- /dev/null
+++ b/Userland/Libraries/LibJS/Tests/strict-mode-errors.js
@@ -0,0 +1,15 @@
+"use strict";
+
+test("basic functionality", () => {
+    [true, false, "foo", 123].forEach(primitive => {
+        expect(() => {
+            primitive.foo = "bar";
+        }).toThrowWithMessage(TypeError, "Cannot assign property foo to primitive value");
+        expect(() => {
+            primitive[Symbol.hasInstance] = 123;
+        }).toThrowWithMessage(
+            TypeError,
+            "Cannot assign property Symbol(Symbol.hasInstance) to primitive value"
+        );
+    });
+});