WrapReturnValues tests, copied from ObjectGraphTailHandler.

_03_objectgraph_handlers/spec/decorators/wrapReturnValues.ts

@@ -0,0 +1,387 @@
+import ObjectGraphTailHandler from "#objectgraph_handlers/source/generated/ObjectGraphTailHandler.js";
+import WrapReturnValues from "#objectgraph_handlers/source/generated/decorators/wrapReturnValues.js";
+
+import {
+  DataDescriptor
+} from "#objectgraph_handlers/source/sharedUtilities.js";
+
+import type {
+  ObjectGraphValuesIfc
+} from "#objectgraph_handlers/source/types/ObjectGraphHeadIfc.js";
+
+import MockMembrane from "../support/MockMembrane.js";
+
+describe("Wrapping return values works for the trap", () => {
+  const membrane = new MockMembrane;
+  let handler: ObjectGraphTailHandler;
+
+  class MockGraphValues implements ObjectGraphValuesIfc {
+    returnArray?: unknown[];
+    returnDesc?: PropertyDescriptor | undefined;
+    returnValue?: unknown;
+
+    incomingValue: unknown;
+    graphKey: unknown;
+
+    getArrayInGraph<Elements extends unknown[] = unknown[]>(
+      valuesInSourceGraph: Elements,
+      sourceGraphKey: string | symbol
+    ): Elements
+    {
+      this.incomingValue = valuesInSourceGraph;
+      this.graphKey = sourceGraphKey;
+      return this.returnArray as Elements;
+    }
+
+    getDescriptorInGraph(
+      descriptorInSourceGraph: PropertyDescriptor | undefined,
+      sourceGraphKey: string | symbol
+    ): PropertyDescriptor | undefined
+    {
+      this.incomingValue = descriptorInSourceGraph;
+      this.graphKey = sourceGraphKey;
+      return this.returnDesc;
+    }
+
+    getValueInGraph(
+      valueInSourceGraph: unknown,
+      sourceGraphKey: string | symbol
+    ): unknown
+    {
+      this.incomingValue = valueInSourceGraph;
+      this.graphKey = sourceGraphKey;
+      return this.returnValue;
+    }
+
+    get isRevoked() {
+      return true;
+    }
+
+    isKnownProxy(value: object): boolean {
+      throw new Error("not implemented");
+    }
+  }
+
+  let mockValues: MockGraphValues;
+
+  beforeEach(() => {
+    handler = new MockGraphTailHandler(membrane, "this graph");
+    mockValues = new MockGraphValues;
+    handler.setThisGraphValues(mockValues);
+  });
+
+  @WrapReturnValues
+  class MockGraphTailHandler extends ObjectGraphTailHandler {
+  }
+
+  it(": apply", () => {
+    const nextTarget = jasmine.createSpy("nextTarget");
+    const nextThisArg = { isNextThis: true };
+    const nextArgArray = [ { arg: 0 }, { arg: 1 } ];
+    const nextReturn = { isNextReturn: true };
+    nextTarget.and.returnValue(nextReturn);
+
+    const shadowTarget = jasmine.createSpy("shadowTarget");
+    const thisArg = { isThis: true };
+    const argArray: unknown[] = [];
+    const shadowReturn = { isShadowReturn: true };
+
+    mockValues.returnValue = shadowReturn;
+
+    expect(handler.apply(
+      shadowTarget, thisArg, argArray, "next graph", nextTarget, nextThisArg, nextArgArray
+    )).toBe(shadowReturn);
+    expect(nextTarget).toHaveBeenCalledOnceWith(...nextArgArray);
+    expect(nextTarget.calls.thisFor(0)).toBe(nextThisArg);
+
+    expect(shadowTarget).toHaveBeenCalledTimes(0);
+
+    expect(mockValues.incomingValue).toBe(nextReturn);
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": construct", () => {
+    //#region set up classes
+    class BaseVehicleNextTarget {
+      static instanceCount = 0;
+
+      instanceIndex: number;
+      spy = jasmine.createSpy();
+      wheelCount: number;
+
+      adjustWheelCount(delta: number): void {
+        this.wheelCount += delta;
+      }
+
+      constructor(wheelCount: number) {
+        this.instanceIndex = BaseVehicleNextTarget.instanceCount++;
+
+        this.wheelCount = wheelCount;
+        this.spy.apply(this, [wheelCount]);
+      }
+    }
+
+    class DerivedVehicleNextTarget extends BaseVehicleNextTarget {
+      #color: string;
+      constructor(wheelCount: number, color: string) {
+        super(wheelCount);
+        this.#color = color;
+      }
+
+      get color(): string {
+        return this.#color;
+      }
+    }
+
+    class BaseVehicleShadowTarget {
+      static instanceCount = 0;
+
+      instanceIndex: number;
+      spy = jasmine.createSpy();
+      wheelCount: number;
+
+      adjustWheelCount(delta: number): void {
+        this.wheelCount += delta;
+      }
+
+      constructor(wheelCount: number) {
+        this.instanceIndex = BaseVehicleShadowTarget.instanceCount++;
+
+        this.wheelCount = wheelCount;
+        this.spy.apply(this, [wheelCount]);
+      }
+    }
+
+    class DerivedVehicleShadowTarget extends BaseVehicleShadowTarget {
+      #color: string;
+      constructor(wheelCount: number, color: string) {
+        super(wheelCount);
+        this.#color = color;
+      }
+
+      get color(): string {
+        return this.#color;
+      }
+    }
+    //#endregion set up classes
+
+    const shadowReturn = { isShadowReturn: true };
+    mockValues.returnValue = shadowReturn;
+
+    const car = handler.construct(
+      DerivedVehicleShadowTarget, [4, "red"], DerivedVehicleShadowTarget, "next graph",
+      DerivedVehicleNextTarget, [4, "red"], DerivedVehicleNextTarget
+    );
+    expect(car).toBe(shadowReturn);
+
+    expect(DerivedVehicleShadowTarget.instanceCount).toBe(0);
+    expect(DerivedVehicleNextTarget.instanceCount).toBe(1);
+
+    expect(mockValues.incomingValue).toBeInstanceOf(DerivedVehicleNextTarget);
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": defineProperty", () => {
+    const shadowTarget = { shadowTarget: true };
+    const shadowDesc = new DataDescriptor("bar", true, true, true);
+
+    const nextTarget = { nextTarget: true };
+    const nextDesc = new DataDescriptor("bar", true, true, true);
+
+    mockValues.returnValue = false;
+
+    const result = handler.defineProperty(
+      shadowTarget, "foo", shadowDesc, "next graph", nextTarget, "foo", nextDesc
+    );
+
+    expect(result).toBeFalse();
+    expect(Reflect.getOwnPropertyDescriptor(shadowTarget, "foo")).toBeUndefined();
+    expect(Reflect.getOwnPropertyDescriptor(nextTarget, "foo")).toEqual({
+      value: "bar",
+      writable: true,
+      enumerable: true,
+      configurable: true
+    });
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": deleteProperty", () => {
+    const shadowTarget = { shadowTarget: true, foo: "bar" };
+    const nextTarget = { nextTarget: true, foo: "bar" };
+
+    mockValues.returnValue = false;
+
+    const result = handler.deleteProperty(
+      shadowTarget, "foo", "next graph", nextTarget, "foo"
+    );
+
+    expect(result).toBeFalse();
+    expect(Reflect.getOwnPropertyDescriptor(shadowTarget, "foo")).toBeDefined();
+    expect(Reflect.getOwnPropertyDescriptor(nextTarget, "foo")).toBeUndefined();
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": get", () => {
+    const shadowTarget = { shadowTarget: true, valueToGet: "red" };
+    const nextTarget = { nextTarget: true, valueToGet: "blue" };
+
+    mockValues.returnValue = "green";
+
+    const result = handler.get(
+      shadowTarget, "valueToGet", shadowTarget, "nextGraph", nextTarget, "valueToGet", nextTarget
+    );
+    expect(result).toBe("green");
+    expect(shadowTarget.valueToGet).toBe("red");
+    expect(nextTarget.valueToGet).toBe("blue");
+
+    expect(mockValues.incomingValue).toBe("blue");
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": getOwnPropertyDescriptor", () => {
+    const shadowTarget = { shadowTarget: true, foo: "wop" };
+    const nextTarget = { nextTarget: true, foo: "bar" };
+
+    const shadowDesc = Reflect.getOwnPropertyDescriptor(shadowTarget, "foo");
+    mockValues.returnDesc = {...shadowDesc};
+
+    const result = handler.getOwnPropertyDescriptor(
+      shadowTarget, "foo", "next graph", nextTarget, "foo"
+    );
+    expect(result).toEqual(shadowDesc);
+    expect(Reflect.get(shadowTarget, "foo")).toBe("wop");
+    expect(Reflect.get(nextTarget, "foo")).toBe("bar");
+
+    expect(mockValues.incomingValue).toEqual({
+      value: "bar",
+      writable: true,
+      enumerable: true,
+      configurable: true
+    });
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": getPrototypeOf", () => {
+    const shadowProto = { shadowPrototype: true };
+    const shadowTarget = Object.create(shadowProto);
+
+    const nextProto = { nextPrototype: true };
+    const nextTarget = Object.create(nextProto);
+
+    mockValues.returnValue = shadowProto;
+
+    expect(handler.getPrototypeOf(
+      shadowTarget, "next graph", nextTarget
+    )).toBe(shadowProto);
+    expect(Reflect.getPrototypeOf(shadowTarget)).toBe(shadowProto);
+    expect(Reflect.getPrototypeOf(nextTarget)).toBe(nextProto);
+
+    expect(mockValues.incomingValue).toBe(nextProto);
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": has", () => {
+    const shadowTarget = { shadowTarget: true };
+    const nextTarget = { nextTarget: true, valueToGet: "blue" };
+
+    mockValues.returnValue = false;
+
+    const result = handler.has(
+      shadowTarget, "valueToGet", "nextGraph", nextTarget, "valueToGet"
+    );
+    expect(result).toBe(false);
+    expect(Reflect.get(shadowTarget, "valueToGet")).toBeUndefined();
+    expect(nextTarget.valueToGet).toBe("blue");
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": isExtensible", () => {
+    const shadowTarget = { shadowTarget: true };
+    const nextTarget = { nextTarget: true };
+    Reflect.preventExtensions(nextTarget);
+
+    mockValues.returnValue = true;
+
+    const result = handler.isExtensible(shadowTarget, "next graph", nextTarget);
+    expect(result).toBe(true);
+    expect(Reflect.isExtensible(shadowTarget)).toBe(true);
+    expect(Reflect.isExtensible(nextTarget)).toBe(false);
+
+    expect(mockValues.incomingValue).toBeFalse();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": ownKeys", () => {
+    const shadowTarget = { shadowTarget: true };
+    const nextTarget = { nextTarget: true };
+
+    mockValues.returnArray = [ "shadowTarget" ];
+
+    expect(
+      handler.ownKeys(shadowTarget, "next graph", nextTarget)
+    ).toEqual(["shadowTarget"]);
+
+    expect(mockValues.incomingValue).toEqual(["nextTarget"]);
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": preventExtensions", () => {
+    const shadowTarget = { shadowTarget: true };
+    const nextTarget = { nextTarget: true };
+
+    mockValues.returnValue = false;
+
+    const result = handler.preventExtensions(
+      shadowTarget, "next graph", nextTarget
+    );
+    expect(result).toBeFalse();
+    expect(Reflect.isExtensible(shadowTarget)).toBe(true);
+    expect(Reflect.isExtensible(nextTarget)).toBe(false);
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": set", () => {
+    const shadowTarget = { shadowTarget: true, valueToGet: "red" };
+    const nextTarget = { nextTarget: true, valueToGet: "blue" };
+
+    mockValues.returnValue = false;
+
+    const result = handler.set(
+      shadowTarget, "valueToGet", "green", shadowTarget, "nextGraph",
+      nextTarget, "valueToGet", "yellow", nextTarget
+    );
+    expect(result).toBeFalse();
+    expect(shadowTarget.valueToGet).toBe("red");
+    expect(nextTarget.valueToGet).toBe("yellow");
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+
+  it(": setPrototypeOf", () => {
+    const shadowProto = { shadowPrototype: true };
+    const shadowTarget = { shadowTarget: true };
+
+    const nextProto = { nextPrototype: true };
+    const nextTarget = { nextTarget: true };
+
+    mockValues.returnValue = false;
+
+    expect(handler.setPrototypeOf(
+      shadowTarget, shadowProto, "next graph", nextTarget, nextProto
+    )).toBeFalse();
+    expect(Reflect.getPrototypeOf(shadowTarget)).toBe(Object.prototype);
+    expect(Reflect.getPrototypeOf(nextTarget)).toBe(nextProto);
+
+    expect(mockValues.incomingValue).toBeTrue();
+    expect(mockValues.graphKey).toBe("this graph");
+  });
+});