[class] Add tests for private static fields

Bug: v8:5368
Change-Id: I4142c4051e394f1a249421bf68da456381e390ae
Reviewed-on: https://chromium-review.googlesource.com/c/1401326Reviewed-by: Adam Klein <adamk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58649}

test/mjsunit/harmony/private-fields-static.js

+// Copyright 2018 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --harmony-private-fields --allow-natives-syntax
+
+
+"use strict";
+
+{
+  class C {
+    static #a;
+    static getA() { return this.#a; }
+  }
+
+  assertEquals(undefined, C.a);
+  assertEquals(undefined, C.getA());
+
+  let c = new C;
+  assertEquals(undefined, c.a);
+}
+
+{
+  class C {
+    static #a = 1;
+    static getA() { return this.#a; }
+  }
+
+  assertEquals(undefined, C.a);
+  assertEquals(1, C.getA());
+
+  let c = new C;
+  assertEquals(undefined, c.a);
+}
+
+{
+  class C {
+    static #a = 1;
+    static #b = this.#a;
+    static getB() { return this.#b; }
+  }
+
+  assertEquals(1, C.getB());
+
+  let c = new C;
+  assertEquals(undefined, c.getB);
+}
+
+{
+  class C {
+    static #a = 1;
+    static getA() { return this.#a; }
+    constructor() {
+      assertThrows(() => this.#a, TypeError);
+      C.#a = 2;
+    }
+  }
+
+  assertEquals(1, C.getA());
+
+  let c = new C;
+  assertThrows(() => C.prototype.getA.call(c));
+  assertEquals(2, C.getA());
+}
+
+{
+  class C {
+    static #a = this;
+    static #b = () => this;
+    static getA() { return this.#a; }
+    static getB() { return this.#b; }
+  }
+
+  assertSame(C, C.getA());
+  assertSame(C, C.getB()());
+}
+
+{
+  class C {
+    static #a = this;
+    static #b = function() { return this; };
+    static getA() { return this.#a; }
+    static getB() { return this.#b; }
+  }
+
+  assertSame(C, C.getA());
+  assertSame(C, C.getB().call(C));
+  assertSame(undefined, C.getB()());
+}
+
+
+{
+  class C {
+    static #a = function() { return 1 };
+    static getA() {return this.#a;}
+  }
+
+  assertEquals('#a', C.getA().name);
+}
+
+{
+  let d = function() { return new.target; }
+  class C {
+    static #c = d;
+    static getC() { return this.#c; }
+  }
+
+  assertEquals(undefined, C.getC()());
+  assertSame(new d, new (C.getC()));
+}
+
+{
+  class C {
+    static #a = 1;
+    static getA(instance) { return instance.#a; }
+  }
+
+  class B { }
+
+  assertEquals(undefined, C.a);
+  assertEquals(1, C.getA(C));
+  assertThrows(() => C.getA(B), TypeError);
+}
+
+{
+  class A {
+    static #a = 1;
+    static getA() { return this.#a; }
+  }
+
+  class B extends A {}
+  assertThrows(() => B.getA(), TypeError);
+}
+
+{
+  class A {
+    static #a = 1;
+    static getA() { return A.#a; }
+  }
+
+  class B extends A {}
+  assertSame(1, B.getA());
+}
+
+{
+  let prototypeLookup = false;
+  class A {
+    static set a(val) {
+      prototypeLookup = true;
+    }
+
+    static get a() { return undefined; }
+  }
+
+  class C extends A {
+    static #a = 1;
+    static getA() { return this.#a; }
+  }
+
+  assertEquals(1, C.getA());
+  assertEquals(false, prototypeLookup);
+}
+
+{
+  class A {
+    static a = 1;
+  }
+
+  class B extends A {
+    static #b = this.a;
+    static getB() { return this.#b; }
+  }
+
+  assertEquals(1, B.getB());
+}
+
+{
+  class A {
+    static #a = 1;
+    static getA() { return this.#a; }
+  }
+
+  class B extends A {
+    static getA() { return super.getA(); }
+  }
+
+  assertThrows(() => B.getA(), TypeError);
+}
+
+{
+  class A {
+    static #a = 1;
+    static getA() { return this.#a;}
+  }
+
+  class B extends A {
+    static #a = 2;
+    static get_A() { return this.#a;}
+  }
+
+  assertEquals(1, A.getA());
+  assertThrows(() => B.getA(), TypeError);
+  assertEquals(2, B.get_A());
+}
+
+{
+  let foo = undefined;
+  class A {
+    static #a = (function() { foo = 1; })();
+  }
+
+  assertEquals(1, foo);
+}
+
+{
+  let foo = undefined;
+  class A extends class {} {
+    static #a = (function() { foo = 1; })();
+  }
+
+  assertEquals(1, foo);
+}
+
+{
+  function makeClass() {
+    return class {
+      static #a;
+      static setA(val) { this.#a = val; }
+      static getA() { return this.#a; }
+    }
+  }
+
+  let classA = makeClass();
+  let classB = makeClass();
+
+  assertEquals(undefined, classA.getA());
+  assertEquals(undefined, classB.getA());
+
+  classA.setA(3);
+  assertEquals(3, classA.getA());
+  assertEquals(undefined, classB.getA());
+
+  classB.setA(5);
+  assertEquals(3, classA.getA());
+  assertEquals(5, classB.getA());
+
+  assertThrows(() => classA.getA.call(classB), TypeError);
+  assertThrows(() => classB.getA.call(classA), TypeError);
+}
+
+{
+  let value = undefined;
+
+  new class {
+    static #a = 1;
+    static getA() { return this.#a; }
+
+    constructor() {
+      new class C {
+        static #a = 2;
+        constructor() {
+          value = C.#a;
+        }
+      }
+    }
+  }
+
+  assertEquals(2, value);
+}
+
+{
+  class A {
+    static #a = 1;
+    static b = class {
+      static getA() { return this.#a; }
+      static get_A(val) { return val.#a; }
+    }
+  }
+
+  assertEquals(1, A.b.getA.call(A));
+  assertEquals(1, A.b.get_A(A));
+}
+
+{
+  assertThrows(() => class { static b = this.#a; static #a = 1 }, TypeError);
+}
+
+{
+  let symbol = Symbol();
+
+  class C {
+    static #a = 1;
+    static [symbol] = 1;
+    static getA() { return this.#a; }
+    static setA(val) { this.#a = val; }
+  }
+
+  var p = new Proxy(C, {
+    get: function(target, name) {
+      if (typeof(arg) === 'symbol') {
+        assertFalse(%SymbolIsPrivate(name));
+      }
+      return target[name];
+    }
+  });
+
+  assertThrows(() => p.getA(), TypeError);
+  assertThrows(() => p.setA(1), TypeError);
+  assertEquals(1, p[symbol]);
+}
+
+{
+  class C {
+    static #b = Object.freeze(this);
+    static getA() { return this.#a; }
+    static #a = 1;
+  }
+
+  assertEquals(1, C.getA());
+}
+
+{
+  class C {
+    static #a = 1;
+    static getA() { return eval('this.#a'); }
+  }
+
+  assertEquals(1, C.getA());
+}
+
+{
+  var C;
+  eval('C = class { static #a = 1; static getA() { return eval(\'this.#a\'); }}');
+
+  assertEquals(1, C.getA());
+}
+
+{
+  class C {
+    static #a = 1;
+    static getA() { return this.#a; }
+    static setA() { eval('this.#a = 4'); }
+  }
+
+  assertEquals(1, C.getA());
+  C.setA();
+  assertEquals(4, C.getA());
+}
+
+{
+  class C {
+    static getA() { return eval('this.#a'); }
+  }
+
+  assertThrows(() => C.getA(), SyntaxError);
+}