LibJS: Convert all remaining non-Array tests to the new system :)

Libraries/LibJS/Tests/classes/class-constructor.js

@@ -0,0 +1,67 @@
+test("property initialization", () => {
+  class A {
+    constructor() {
+      this.x = 3;
+    }
+  }
+
+  expect(new A().x).toBe(3);
+});
+
+test("method initialization", () => {
+  class A {
+    constructor() {
+      this.x = () => 10;
+    }
+  }
+
+  expect(new A().x()).toBe(10);
+});
+
+test("initialize to class method", () => {
+  class A {
+    constructor() {
+      this.x = this.method;
+    }
+
+    method() {
+      return 10;
+    }
+  }
+
+  expect(new A().x()).toBe(10);
+});
+
+test("constructor length affects class length", () => {
+  class A {
+    constructor() {}
+  }
+
+  expect(A).toHaveLength(0);
+
+  class B {
+    constructor(a, b, c = 2) {}
+  }
+
+  expect(B).toHaveLength(2);
+});
+
+test.skip("must be invoked with 'new'", () => {
+  class A {
+    constructor() {}
+  }
+
+  expect(() => {
+    A();
+  }).toThrow(TypeError); // FIXME: Add message when this test works
+
+  expect(() => {
+    A.prototype.constructor();
+  }).toThrow(TypeError); // FIXME: Add message when this test works
+});
+
+test("implicit constructor", () => {
+  class A {}
+
+  expect(new A()).toBeInstanceOf(A);
+});