1 files changed, 223 insertions, 0 deletions
diff --git a/js/src/tests/non262/expressions/optional-chain.js b/js/src/tests/non262/expressions/optional-chain.js
new file mode 100644
index 000000000..04e090935
--- /dev/null
+++ b/js/src/tests/non262/expressions/optional-chain.js
@@ -0,0 +1,223 @@
+var BUGNUMBER = 1566143;
+var summary = "Implement the Optional Chain operator (?.) proposal";
+
+print(BUGNUMBER + ": " + summary);
+
+// These tests are originally from webkit.
+// webkit specifics have been removed and error messages have been updated.
+function shouldBe(actual, expected) {
+    if (actual !== expected)
+        throw new Error(`expected ${expected} but got ${actual}`);
+}
+
+function shouldThrowSyntaxError(script) {
+    let error;
+    try {
+        eval(script);
+    } catch (e) {
+        error = e;
+    }
+
+    if (!(error instanceof SyntaxError))
+        throw new Error('Expected SyntaxError!');
+}
+
+function shouldNotThrowSyntaxError(script) {
+    let error;
+    try {
+        eval(script);
+    } catch (e) {
+        error = e;
+    }
+
+    if ((error instanceof SyntaxError))
+        throw new Error('Unxpected SyntaxError!');
+}
+
+function shouldThrowTypeError(func, messagePrefix) {
+    let error;
+    try {
+        func();
+    } catch (e) {
+        error = e;
+    }
+
+    if (!(error instanceof TypeError))
+        throw new Error('Expected TypeError!');
+}
+function testBasicSuccessCases() {
+    shouldBe(undefined?.valueOf(), undefined);
+    shouldBe(null?.valueOf(), undefined);
+    shouldBe(true?.valueOf(), true);
+    shouldBe(false?.valueOf(), false);
+    shouldBe(0?.valueOf(), 0);
+    shouldBe(1?.valueOf(), 1);
+    shouldBe(''?.valueOf(), '');
+    shouldBe('hi'?.valueOf(), 'hi');
+    shouldBe(({})?.constructor, Object);
+    shouldBe(({ x: 'hi' })?.x, 'hi');
+    shouldBe([]?.length, 0);
+    shouldBe(['hi']?.length, 1);
+
+    shouldBe(undefined?.['valueOf'](), undefined);
+    shouldBe(null?.['valueOf'](), undefined);
+    shouldBe(true?.['valueOf'](), true);
+    shouldBe(false?.['valueOf'](), false);
+    shouldBe(0?.['valueOf'](), 0);
+    shouldBe(1?.['valueOf'](), 1);
+    shouldBe(''?.['valueOf'](), '');
+    shouldBe('hi'?.['valueOf'](), 'hi');
+    shouldBe(({})?.['constructor'], Object);
+    shouldBe(({ x: 'hi' })?.['x'], 'hi');
+    shouldBe([]?.['length'], 0);
+    shouldBe(['hi']?.[0], 'hi');
+
+    shouldBe(undefined?.(), undefined);
+    shouldBe(null?.(), undefined);
+    shouldBe((() => 3)?.(), 3);
+}
+
+function testBasicFailureCases() {
+    shouldThrowTypeError(() => true?.(), 'true is not a function');
+    shouldThrowTypeError(() => false?.(), 'false is not a function');
+    shouldThrowTypeError(() => 0?.(), '0 is not a function');
+    shouldThrowTypeError(() => 1?.(), '1 is not a function');
+    shouldThrowTypeError(() => ''?.(), '"" is not a function');
+    shouldThrowTypeError(() => 'hi'?.(), '"hi" is not a function');
+    shouldThrowTypeError(() => ({})?.(), '({}) is not a function');
+    shouldThrowTypeError(() => ({ x: 'hi' })?.(), '({x:"hi"}) is not a function');
+    shouldThrowTypeError(() => []?.(), '[] is not a function');
+    shouldThrowTypeError(() => ['hi']?.(), '[...] is not a function');
+}
+
+testBasicSuccessCases();
+
+testBasicFailureCases();
+
+shouldThrowTypeError(() => ({})?.i(), '(intermediate value).i is not a function');
+shouldBe(({}).i?.(), undefined);
+shouldBe(({})?.i?.(), undefined);
+shouldThrowTypeError(() => ({})?.['i'](), '(intermediate value)["i"] is not a function');
+shouldBe(({})['i']?.(), undefined);
+shouldBe(({})?.['i']?.(), undefined);
+
+shouldThrowTypeError(() => ({})?.a['b'], 'can\'t access property "b", (intermediate value).a is undefined');
+shouldBe(({})?.a?.['b'], undefined);
+shouldBe(null?.a['b']().c, undefined);
+shouldThrowTypeError(() => ({})?.['a'].b, 'can\'t access property "b", (intermediate value)["a"] is undefined');
+shouldBe(({})?.['a']?.b, undefined);
+shouldBe(null?.['a'].b()['c'], undefined);
+shouldBe(null?.()().a['b'], undefined);
+
+const o0 = { a: { b() { return this._b.bind(this); }, _b() { return this.__b; }, __b: { c: 42 } } };
+shouldBe(o0?.a?.['b']?.()?.()?.c, 42);
+shouldBe(o0?.i?.['j']?.()?.()?.k, undefined);
+shouldBe((o0.a?._b)?.().c, 42);
+shouldBe((o0.a?._b)().c, 42);
+shouldBe((o0.a?.b?.())?.().c, 42);
+shouldBe((o0.a?.['b']?.())?.().c, 42);
+
+shouldBe(({ undefined: 3 })?.[null?.a], 3);
+shouldBe((() => 3)?.(null?.a), 3);
+
+const o1 = { count: 0, get x() { this.count++; return () => {}; } };
+o1.x?.y;
+shouldBe(o1.count, 1);
+o1.x?.['y'];
+shouldBe(o1.count, 2);
+o1.x?.();
+shouldBe(o1.count, 3);
+null?.(o1.x);
+shouldBe(o1.count, 3);
+
+shouldBe(delete undefined?.foo, true);
+shouldBe(delete null?.foo, true);
+shouldBe(delete undefined?.['foo'], true);
+shouldBe(delete null?.['foo'], true);
+shouldBe(delete undefined?.(), true);
+shouldBe(delete null?.(), true);
+shouldBe(delete ({}).a?.b?.b, true);
+shouldBe(delete ({a : {b: undefined}}).a?.b?.b, true);
+shouldBe(delete ({a : {b: undefined}}).a?.["b"]?.["b"], true);
+
+const o2 = { x: 0, y: 0, z() {} };
+shouldBe(delete o2?.x, true);
+shouldBe(o2.x, undefined);
+shouldBe(o2.y, 0);
+shouldBe(delete o2?.x, true);
+shouldBe(delete o2?.['y'], true);
+shouldBe(o2.y, undefined);
+shouldBe(delete o2?.['y'], true);
+shouldBe(delete o2.z?.(), true);
+
+function greet(name) { return `hey, ${name}${this.suffix ?? '.'}`; }
+shouldBe(eval?.('greet("world")'), 'hey, world.');
+shouldBe(greet?.call({ suffix: '!' }, 'world'), 'hey, world!');
+shouldBe(greet.call?.({ suffix: '!' }, 'world'), 'hey, world!');
+shouldBe(null?.call({ suffix: '!' }, 'world'), undefined);
+shouldBe(({}).call?.({ suffix: '!' }, 'world'), undefined);
+shouldBe(greet?.apply({ suffix: '?' }, ['world']), 'hey, world?');
+shouldBe(greet.apply?.({ suffix: '?' }, ['world']), 'hey, world?');
+shouldBe(null?.apply({ suffix: '?' }, ['world']), undefined);
+shouldBe(({}).apply?.({ suffix: '?' }, ['world']), undefined);
+shouldThrowSyntaxError('class C {} class D extends C { foo() { return super?.bar; } }');
+shouldThrowSyntaxError('class C {} class D extends C { foo() { return super?.["bar"]; } }');
+shouldThrowSyntaxError('class C {} class D extends C { constructor() { super?.(); } }');
+shouldThrowSyntaxError('const o = { C: class {} }; new o?.C();')
+shouldThrowSyntaxError('const o = { C: class {} }; new o?.["C"]();')
+shouldThrowSyntaxError('class C {} new C?.();')
+shouldThrowSyntaxError('function foo() { new?.target; }');
+shouldThrowSyntaxError('function tag() {} tag?.``;');
+shouldThrowSyntaxError('const o = { tag() {} }; o?.tag``;');
+
+// NOT an optional chain
+shouldBe(false?.4:5, 5);
+
+function testSideEffectCountFunction() {
+  let count = 0;
+  let a = {
+    b: {
+      c: {
+        d: () => {
+          count++;
+          return a;
+        }
+      }
+    }
+  }
+
+  a.b.c.d?.()?.b?.c?.d
+
+  shouldBe(count, 1);
+}
+
+function testSideEffectCountGetters() {
+  let count = 0;
+  let a = {
+    get b() {
+      count++;
+      return { c: {} };
+    }
+  }
+
+  a.b?.c?.d;
+  shouldBe(count, 1);
+  a.b?.c?.d;
+  shouldBe(count, 2);
+}
+
+testSideEffectCountFunction();
+testSideEffectCountGetters();
+
+// stress test SM
+shouldBe(({a : {b: undefined}}).a.b?.()()(), undefined);
+shouldBe(({a : {b: undefined}}).a.b?.()?.()(), undefined);
+shouldBe(({a : {b: () => undefined}}).a.b?.()?.(), undefined);
+shouldThrowTypeError(() => delete ({a : {b: undefined}}).a?.b.b.c, 'can\'t access property "b", (intermediate value).a.b is undefined');
+shouldBe(delete ({a : {b: undefined}}).a?.["b"]?.["b"], true);
+shouldThrowTypeError(() => (({a : {b: () => undefined}}).a.b?.())(), 'undefined is not a function');
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");