Everywhere: Hoist the Libraries folder to the top-level

Libraries/LibJS/Tests/functions/function-strict-mode.js

@@ -0,0 +1,69 @@
+test("non strict-mode by default", () => {
+    expect(isStrictMode()).toBeFalse();
+});
+
+test("use strict with double quotes", () => {
+    "use strict";
+    expect(isStrictMode()).toBeTrue();
+});
+
+// prettier-ignore
+test("use strict with single quotes", () => {
+    'use strict';
+    expect(isStrictMode()).toBeTrue();
+});
+
+// prettier-ignore
+test("use strict with backticks does not yield strict mode", () => {
+    `use strict`;
+    expect(isStrictMode()).toBeFalse();
+});
+
+// prettier-ignore
+test("use strict with single quotes after statement does not yield strict mode code", () => {
+    ;'use strict';
+    expect(isStrictMode()).toBeFalse();
+});
+
+// prettier-ignore
+test("use strict with double quotes after statement does not yield strict mode code", () => {
+    ;"use strict";
+    expect(isStrictMode()).toBeFalse();
+});
+
+test("use strict interrupted by a line continuation does not yield strict mode code", () => {
+    "use \
+strict";
+    expect(isStrictMode()).toBeFalse();
+});
+
+test("strict mode propagates down the scope chain", () => {
+    "use strict";
+    expect(isStrictMode()).toBeTrue();
+    (function () {
+        expect(isStrictMode()).toBeTrue();
+    })();
+});
+
+test("strict mode does not propagate up the scope chain", () => {
+    expect(isStrictMode()).toBeFalse();
+    (function () {
+        "use strict";
+        expect(isStrictMode()).toBeTrue();
+    })();
+    expect(isStrictMode()).toBeFalse();
+});
+
+test('only the string "use strict" yields strict mode code', () => {
+    "use stric";
+    expect(isStrictMode()).toBeFalse();
+});
+
+test("strict mode does not apply global object to |this|", () => {
+    "use strict";
+    let functionThis;
+    (function () {
+        functionThis = this;
+    })();
+    expect(functionThis).toBeUndefined();
+});