Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/labels.js

@@ -0,0 +1,47 @@
+test("labeled plain scope", () => {
+    test: {
+        let o = 1;
+        expect(o).toBe(1);
+        break test;
+        expect().fail();
+    }
+});
+
+test("break on plain scope from inner scope", () => {
+    outer: {
+        {
+            break outer;
+        }
+        expect().fail();
+    }
+});
+
+test("labeled for loop with break", () => {
+    let counter = 0;
+    outer: for (a of [1, 2, 3]) {
+        for (b of [4, 5, 6]) {
+            if (a === 2 && b === 5) break outer;
+            counter++;
+        }
+    }
+    expect(counter).toBe(4);
+});
+
+test("labeled for loop with continue", () => {
+    let counter = 0;
+    outer: for (a of [1, 2, 3]) {
+        for (b of [4, 5, 6]) {
+            if (b === 6) continue outer;
+            counter++;
+        }
+    }
+    expect(counter).toBe(6);
+});
+
+test("invalid label across scope", () => {
+    expect(`
+        label: {
+            (() => { break label; });
+        }
+    `).not.toEval();
+});