1 files changed, 29 insertions, 0 deletions
diff --git a/Libraries/LibJS/Tests/string-escapes.js b/Libraries/LibJS/Tests/string-escapes.js
index e4abf9ec07..d8c75e9055 100644
--- a/Libraries/LibJS/Tests/string-escapes.js
+++ b/Libraries/LibJS/Tests/string-escapes.js
@@ -13,3 +13,32 @@ test("unicode escapes", () => {
     expect(`\u{1f41e}`).toBe("🐞");
     expect("\u00ff").toBe(String.fromCharCode(0xff));
 });
+
+describe("octal escapes", () => {
+    test("basic functionality", () => {
+        expect("\1").toBe("\u0001");
+        expect("\2").toBe("\u0002");
+        expect("\3").toBe("\u0003");
+        expect("\4").toBe("\u0004");
+        expect("\5").toBe("\u0005");
+        expect("\6").toBe("\u0006");
+        expect("\7").toBe("\u0007");
+        expect("\8").toBe("8");
+        expect("\9").toBe("9");
+        expect("\128").toBe("\n8");
+        expect("\141bc").toBe("abc");
+        expect("f\157o\142a\162").toBe("foobar");
+        expect("\123\145\162\145\156\151\164\171\117\123").toBe("SerenityOS");
+    });
+
+    test("syntax error in template literal", () => {
+        expect("`\\123`").not.toEval();
+    });
+
+    test("syntax error in strict mode", () => {
+        expect("'use strict'; '\\123'").not.toEval();
+        expect('"use strict"; "\\123"').not.toEval();
+        // Special case, string literal precedes use strict directive
+        expect("'\\123'; somethingElse; 'use strict'").not.toEval();
+    });
+});