Libraries: Move to Userland/Libraries/

Userland/Libraries/LibJS/Tests/classes/class-setters.js

@@ -0,0 +1,108 @@
+test("basic functionality", () => {
+    class A {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    expect(A.x).toBeUndefined();
+    expect(A).not.toHaveProperty("_x");
+    const a = new A();
+    expect(a.x).toBeUndefined();
+    expect(a).not.toHaveProperty("_x");
+    a.x = 3;
+    expect(a.x).toBe(6);
+    expect(a).toHaveProperty("_x", 6);
+});
+
+test("name", () => {
+    class A {
+        set x(v) {}
+    }
+
+    const d = Object.getOwnPropertyDescriptor(A.prototype, "x");
+    expect(d.set.name).toBe("set x");
+});
+
+test("extended name syntax", () => {
+    const s = Symbol("foo");
+
+    class A {
+        set "method with space"(value) {
+            this.a = value;
+        }
+
+        set 12(value) {
+            this.b = value;
+        }
+
+        set [`he${"llo"}`](value) {
+            this.c = value;
+        }
+
+        set [s](value) {
+            this.d = value;
+        }
+    }
+
+    const a = new A();
+    a["method with space"] = 1;
+    a[12] = 2;
+    a.hello = 3;
+    a[s] = 4;
+    expect(a.a).toBe(1);
+    expect(a.b).toBe(2);
+    expect(a.c).toBe(3);
+    expect(a.d).toBe(4);
+});
+
+test("inherited setter", () => {
+    class Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    class Child extends Parent {}
+
+    const c = new Child();
+
+    expect(c.x).toBeUndefined();
+    c.x = 10;
+    expect(c.x).toBe(20);
+});
+
+test("inherited static setter overriding", () => {
+    class Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 2;
+        }
+    }
+
+    class Child extends Parent {
+        get x() {
+            return this._x;
+        }
+
+        set x(value) {
+            this._x = value * 3;
+        }
+    }
+
+    const c = new Child();
+    expect(c.x).toBeUndefined();
+    c.x = 10;
+    expect(c.x).toBe(30);
+});