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sinon.spy();\n for(let x0 = 0;x0 < 5; x0++) {\n x0;\n x0 += 1\n spy(x0)\n }\n expect(spy).to.have.been.calledThrice;\n spy.reset();\n \n for(var x0 = 0;x0 < 5; x0++) {\n x0;\n x0 += 1\n spy(x0)\n }\n expect(spy).to.have.been.calledThrice;\n \n // #TODO: test properly\n var y =8;\n for(var x in window) {\n // console.log(\"x: \" + x)\n y += x\n x = 42;\n }\n \n for(var x2 of Object.keys(window)) {\n // console.log(\"x2: \" + x2)\n y += x2\n x2 = 42;\n }\n \n (async () => {\n for await (var x3 of Object.keys(window)) {\n // console.log(\"x3: \" + x3)\n y += x3\n x3 = 42;\n }\n })();\n\n for(let x4 in window) {\n // console.log(\"x4: \" + x4)\n y += x4\n x4 = 42;\n }\n\n });\n \n it('for loop/local variable (var)', () => {\n let x = 0;\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for(var i = 0; i < 3; i += 1) {\n x += i;\n }\n expect(spy).to.be.calledTwice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n });\n \n it('for loop/local variable (let)', () => {\n let x = 0;\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for(let i = 0; i < 3; i += 1) {\n x += i;\n }\n expect(spy).to.be.calledTwice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n });\n // TODO: we do not yet support tracking iterator variables\n xit('track changes on iterator variable (var)', () => {\n const spy = sinon.spy();\n const holder = {};\n\n for(var i = 0; i < 3; i += 1) {\n holder.aexpr = holder.aexpr || aexpr(() => i).onChange(spy);\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(2);\n expect(spy).to.be.calledWithMatch(3);\n });\n xit('track changes on iterator variable (let)', () => {\n const spy = sinon.spy();\n const holder = {};\n\n for(let i = 0; i < 3; i += 1) {\n holder.aexpr = holder.aexpr || aexpr(() => i).onChange(spy);\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(2);\n expect(spy).to.be.calledWithMatch(3);\n });\n it('for-in/local variable (var)', () => {\n let x = 0;\n const obj = { a: 42, b: 17 };\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for(var i in obj) {\n x += obj[i];\n }\n expect(spy).to.be.calledTwice;\n expect(spy).to.be.calledWithMatch(42);\n expect(spy).to.be.calledWithMatch(59);\n });\n it('for-in/local variable (let)', () => {\n let x = 0;\n const obj = { a: 42, b: 17 };\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for(let i in obj) {\n x += obj[i];\n }\n expect(spy).to.be.calledTwice;\n expect(spy).to.be.calledWithMatch(42);\n expect(spy).to.be.calledWithMatch(59);\n });\n it('for-of/local variable (var)', () => {\n let x = 0;\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for (var a of [1,2,3]) {\n x += a;\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n it('for-of/local variable (var, defined outside)', () => {\n let x = 0;\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n var a;\n for (a of [1,2,3]) {\n x += a;\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n it('for-of/local variable (let)', () => {\n let x = 0;\n const spy = sinon.spy();\n aexpr(() => x).onChange(spy);\n\n for (let a of [1,2,3]) {\n x += a;\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n // TODO: we do not yet support tracking quasi-assignments in loops\n xit('for-of/object member', () => {\n let obj = { prop: 0 };\n const spy = sinon.spy();\n aexpr(() => obj.prop).onChange(spy);\n\n for (obj.prop of [1,2,3]) {\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n xit('for-of/destructuring to members', () => {\n let obj = { prop: 0 };\n const spy = sinon.spy();\n aexpr(() => obj.prop).onChange(spy);\n\n for ([obj.prop] of [[1],[2],[3]]) {\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n xit('for-of/destructuring to var and members', () => {\n var a = 0;\n const spy = sinon.spy();\n aexpr(() => a).onChange(spy);\n\n for ([a] of [[1],[2],[3]]) {\n }\n expect(spy).to.be.calledThrice;\n expect(spy).to.be.calledWithMatch(1);\n expect(spy).to.be.calledWithMatch(3);\n expect(spy).to.be.calledWithMatch(6);\n });\n});\n\n// #TODO: spread arguments\n\ndescribe('super', () => {\n \n it('source transform allows for super', () => {\n class A {\n constructor(arg) {\n this.value = 42 + arg;\n }\n }\n \n class B extends A {\n constructor(arg) {\n super(arg);\n }\n }\n \n expect(new B('b')).to.have.property('value', '42b');\n });\n\n it('source transform allows for super.func(x)', () => {\n class A {\n double(arg) {\n return arg * 2;\n }\n }\n \n class B extends A {\n double(arg) {\n return super.double(arg) * 3;\n }\n }\n \n expect(new B().double(1)).to.equal(6);\n });\n\n});\n\ndescribe('new.target', () => {\n \n it('source transform allows for new.target', () => {\n class A {\n constructor() {\n this.myClass = new.target;\n }\n }\n \n expect(new A()).to.have.property('myClass', A);\n });\n\n it('new.target works correctly for subclasses', () => {\n class A {\n constructor() {\n this.myClass = new.target;\n }\n }\n \n class B extends A {\n constructor() {\n super();\n expect(new.target).to.equal(B);\n }\n }\n \n expect(new B()).to.have.property('myClass', B);\n });\n\n it('new.target as part of a member expression', () => {\n class A {\n constructor() {\n this.myClassName = new.target.name;\n }\n }\n \n expect(new A()).to.have.property('myClassName', 'A');\n });\n\n});\n\ndescribe('Propagation Logic', function() {\n it('is a transparent wrapper for property accesses', () => {\n let obj = {\n prop: 42,\n func(mul) { return this.prop * mul}\n };\n\n expect(obj.prop).to.equal(42);\n expect(obj.func(2)).to.equal(84);\n\n obj.prop /= 3;\n\n expect(obj.prop).to.equal(14);\n expect(obj.func(2)).to.equal(28);\n });\n\n it('should be supported with proper integration', () => {\n let obj = { prop: 42 },\n spy = sinon.spy();\n\n aexpr(() => obj.prop).onChange(spy);\n expect(spy).not.to.be.called;\n\n obj.prop = 17;\n expect(spy).to.be.calledOnce;\n });\n\n it('should recalculate to recognize latest changes', () => {\n let obj = {\n prop: 'a',\n a: 15,\n b: 32\n };\n let spy = sinon.spy();\n\n aexpr(() => obj[obj.prop]).onChange(spy);\n\n obj.a = 17;\n expect(spy.withArgs(17)).to.be.calledOnce;\n\n obj.prop = 'b';\n expect(spy.withArgs(32)).to.be.calledOnce;\n\n obj.a = 42;\n expect(spy.withArgs(42)).not.to.be.called;\n\n obj.b = 33;\n expect(spy.withArgs(33)).to.be.calledOnce;\n });\n\n it('applies the given operator', () => {\n let obj = {\n a: 5\n };\n let spy = sinon.spy();\n\n aexpr(() => obj.a).onChange(spy);\n\n obj.a *= 1;\n expect(spy).not.to.be.called;\n\n obj.a += 2;\n expect(spy.withArgs(7)).to.be.calledOnce;\n });\n\n it('retain the this reference semantic', () => {\n let obj = {\n a: 5,\n func() { return this.a * 3; }\n };\n let spy = sinon.spy();\n\n aexpr(() => obj.func()).onChange(spy);\n\n obj.a = 1;\n\n expect(spy.withArgs(3)).to.be.calledOnce;\n });\n \n it('reset all active expressions', () => {\n const obj = {\n get calcProp() { return this.x + this.y; },\n x: 42,\n y: 17\n },\n spy = sinon.spy();\n\n aexpr(() => obj.calcProp).onChange(spy);\n\n obj.x = 33;\n expect(spy).to.be.calledWith(50);\n });\n\n it('reset all active expressions', () => {\n let obj = { prop: 42 },\n spy = sinon.spy();\n\n aexpr(() => obj.prop).onChange(spy);\n\n reset();\n\n obj.prop = 17;\n expect(spy).not.to.be.called;\n });\n\n describe('parametrizable aexprs', () => {\n afterEach(() => {\n reset();\n });\n\n it('handles a single instance binding', () => {\n let _scope = {};\n let obj = { val: 17 },\n spy = sinon.spy();\n\n aexpr(o => o.val, { params: [obj] }).onChange(spy);\n\n expect(spy).not.to.be.called;\n\n obj.val = 42;\n\n expect(spy).to.be.calledOnce;\n });\n\n it(\"handle aexprs with one instance binding with multiple variables\", () => {\n let obj1 = { val: 1 },\n obj2 = { val: 2 },\n obj3 = { val: 3 },\n spy = sinon.spy();\n\n aexpr((o1, o2, o3) => o1.val + o2.val + o3.val, { params: [obj1, obj2, obj3] }).onChange(spy);\n\n expect(spy).not.to.be.called;\n\n obj1.val = 10;\n\n expect(spy.withArgs(15)).to.be.calledOnce;\n\n obj2.val = 20;\n\n expect(spy.withArgs(33)).to.be.calledOnce;\n });\n\n it(\"handle aexprs with multiple instance bindings\", () => {\n let obj1 = { val: 1 },\n obj2 = { val: 2 },\n obj3 = { val: 3 },\n spy12 = sinon.spy(),\n spy23 = sinon.spy(),\n expr = (o1, o2) => o1.val + o2.val;\n\n aexpr(expr, { params: [obj1, obj2] }).onChange(spy12);\n aexpr(expr, { params: [obj2, obj3] }).onChange(spy23);\n\n expect(spy12).not.to.be.called;\n expect(spy23).not.to.be.called;\n\n obj1.val = 10;\n\n expect(spy12.withArgs(12)).to.be.calledOnce;\n expect(spy23).not.to.be.called;\n\n obj2.val = 20;\n\n expect(spy12.withArgs(30)).to.be.calledOnce;\n expect(spy23.withArgs(23)).to.be.calledOnce;\n\n obj3.val = 30;\n\n expect(spy12.withArgs(30)).to.be.calledOnce;\n expect(spy23.withArgs(50)).to.be.calledOnce;\n });\n });\n\n describe('locals', () => {\n\n it('is a transparent wrapper for local variables', () => {\n var x = 0, y = 1, z = 2;\n\n let func, inc;\n {\n let x = 42;\n func = function() {\n return x;\n };\n inc = function() {\n x += 1;\n };\n }\n\n expect(func()).to.equal(42);\n\n x = 17;\n\n expect(x).to.equal(17);\n expect(func()).to.equal(42);\n\n inc();\n\n expect(x).to.equal(17);\n expect(func()).to.equal(43);\n });\n\n it('should be supported with proper integration', () => {\n let value = 17,\n spy = sinon.spy();\n\n aexpr(() => value).onChange(spy);\n\n expect(spy).not.to.be.called;\n\n value = 42;\n expect(spy).to.be.calledOnce;\n });\n\n it('should recalculate to recognize latest changes', () => {\n let obj = { a: 15 },\n obj2 = obj,\n spy = sinon.spy();\n\n aexpr(() => obj.a).onChange(spy);\n\n obj.a = 17;\n expect(spy.withArgs(17)).to.be.calledOnce;\n\n obj = { a: 32 };\n expect(spy.withArgs(32)).to.be.calledOnce;\n\n obj2.a = 42;\n expect(spy.withArgs(42)).not.to.be.called;\n\n obj.a = 33;\n expect(spy.withArgs(33)).to.be.calledOnce;\n });\n\n it('reset all active expressions', () => {\n let value = 42,\n spy = sinon.spy();\n\n aexpr(() => value).onChange(spy);\n\n reset();\n\n value = 17;\n expect(spy).not.to.be.called;\n });\n });\n\n describe('globals', () => {\n it('interacts with member accesses on global object', () => {\n window.globalValue = 17;\n let spy = sinon.spy();\n\n aexpr(() => globalValue).onChange(spy);\n expect(spy).not.to.be.called;\n\n globalValue = 33;\n expect(spy.withArgs(33)).to.be.calledOnce;\n\n window.globalValue = 42;\n expect(spy).to.be.calledWithMatch(42);\n });\n\n it('should be supported with proper integration', () => {\n window.globalValue = 17;\n let spy = sinon.spy();\n\n aexpr(() => globalValue).onChange(spy);\n expect(spy).not.to.be.called;\n\n globalValue = 42;\n expect(spy).to.be.calledOnce;\n });\n\n it('reset all active expressions', () => {\n globalValue = 42;\n let spy = sinon.spy();\n\n aexpr(() => globalValue).onChange(spy);\n\n reset();\n\n globalValue = 17;\n expect(spy).not.to.be.called;\n });\n });\n\n it('aexpr ordering', () => {\n let a = 1;\n let b = 1;\n let spyA = sinon.spy(),\n spyB = sinon.spy();\n\n aexpr(() => a).onChange(spyA);\n aexpr(() => b).onChange(spyB);\n\n a = b = 2;\n expect(spyA).to.be.calledAfter(spyB);\n });\n\n xit('support assignments in aexprs', () => {\n let a = 1;\n let b = 1;\n let spy = sinon.spy();\n\n aexpr(() => {\n b = b + 1; // #TODO: do we even want to support this?\n return a;\n }).onChange(spy);\n\n a = 2;\n expect(spy).to.be.calledOnce;\n });\n\n xit('monitor collections for change', () => {\n let arr = [1,2];\n let spy = sinon.spy();\n \n monitorCollection(); // or\n arr::monitor().onChange(spy);\n \n arr.push(3);\n expect(spy).to.be.calledOnce;\n });\n\n describe('module-scoped variables', () => {\n it('track assignment to module-scoped variable', () => {\n const spy = sinon.spy();\n\n aexpr(() => moduleScopedVariable).onChange(spy);\n expect(spy).not.to.be.called;\n\n moduleScopedVariable = 2;\n expect(spy).to.be.calledWithMatch(2);\n })\n });\n\n describe('members', () => {\n it('triggers correct callbacks', () => {\n let rect = {\n extent: { x: 2, y: 2 },\n width() { return this.extent.x; }\n };\n\n let spyExtent = sinon.spy(),\n spyWidth = sinon.spy();\n\n aexpr(() => rect.width()).onChange(spyWidth);\n aexpr(() => rect.extent).onChange(spyExtent);\n\n rect.extent = { x: 2, y: 2 };\n expect(spyWidth).not.to.be.called;\n expect(spyExtent).to.be.calledWithMatch({ x: 2, y: 2 });\n spyExtent.reset();\n\n rect.extent.x = 3;\n expect(spyWidth).to.be.calledWithMatch(3);\n expect(spyExtent).not.to.be.called;\n }); \n\n describe('nested members', () => {\n it('handle nested members', () => {\n let a = { b: { c: { d: { e: { f: 1 } } } } };\n let spy = sinon.spy();\n\n aexpr(() => a.b.c.d.e.f).onChange(spy);\n\n a.b = { c: { d: { e: { f: 2 } } } };\n expect(spy).to.be.calledWithMatch(2);\n\n a.b.c = { d: { e: { f: 3 } } };\n expect(spy).to.be.calledWithMatch(3);\n\n a.b.c.d = { e: { f: 4 } };\n expect(spy).to.be.calledWithMatch(4);\n\n a.b.c.d.e = { f: 5 };\n expect(spy).to.be.calledWithMatch(5);\n\n a.b.c.d.e.f = 6;\n expect(spy).to.be.calledWithMatch(6);\n });\n \n it('handle nested member functions', () => {\n let a = { b() { return b; } };\n let b = { c() { return c; } };\n let c = { d() { return d; } };\n let d = { e() { return e; } };\n let e = { f() { return 1; } };\n let b2 = { c() { return c2; } };\n let c2 = { d() { return d2; } };\n let d2 = { e() { return e2; } };\n let e2 = { f() { return 2; } };\n let c3 = { d() { return d3; } };\n let d3 = { e() { return e3; } };\n let e3 = { f() { return 3; } };\n let d4 = { e() { return e4; } };\n let e4 = { f() { return 4; } };\n let e5 = { f() { return 5; } };\n let spy = sinon.spy();\n\n aexpr(() => a.b().c().d().e().f()).onChange(spy);\n \n a.b = () => b2;\n expect(spy).to.be.calledWithMatch(2);\n\n a.b().c = () => c3;\n expect(spy).to.be.calledWithMatch(3);\n\n a.b().c().d = () => d4;\n expect(spy).to.be.calledWithMatch(4);\n\n a.b().c().d().e = () => e5;\n expect(spy).to.be.calledWithMatch(5);\n });\n \n it('handle nested mixed members and member functions', () => {\n let f = 1;\n let d = { e: { f() { return f; } } };\n let b = { c: { d() { return d; } } };\n let a = { b() { return b; } };\n\n let f2 = 2;\n let e2 = { f() { return f2; } };\n let d2 = { e: e2 };\n let c2 = { d() { return d2; } };\n let b2 = { c: c2 };\n \n let f3 = 3;\n let e3 = { f() { return f3; } };\n let d3 = { e: e3 };\n let c3 = { d() { return d3; } };\n\n let f4 = 4;\n let e4 = { f() { return f4; } };\n let d4 = { e: e4 };\n\n let f5 = 5;\n let e5 = { f() { return f5; } };\n\n let spy = sinon.spy();\n\n aexpr(() => a.b().c.d().e.f()).onChange(spy);\n\n a.b = () => b2;\n expect(spy).to.be.calledWithMatch(2);\n\n a.b().c = c3;\n expect(spy).to.be.calledWithMatch(3);\n\n a.b().c.d = () => d4;\n expect(spy).to.be.calledWithMatch(4);\n\n a.b().c.d().e = e5;\n expect(spy).to.be.calledWithMatch(5);\n\n a.b().c.d().e = { f() { return 6; }};\n expect(spy).to.be.calledWithMatch(6);\n });\n });\n it('binds `this` correctly', () => {\n const obj = {\n get computedProp() { return this.basicProp + 1 },\n set computedProp(value) { return this.basicProp = value -1; },\n basicProp: 'basicProp'\n }\n const spy = sinon.spy();\n\n expect(obj.computedProp).to.equal(obj.basicProp + 1);\n \n aexpr(() => obj.computedProp).onChange(spy);\n\n obj.computedProp = 5;\n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWith(5);\n expect(obj.basicProp).to.equal(4);\n });\n });\n});\n\ndescribe(\"misc\", () => {\n it(\"rewrite call expression in sequence expression does not result in stack overflow\", () => {\n const obj = {\n x: 3,\n fn() {\n return this.x;\n }\n };\n \n (obj.fn(), obj.fn());\n });\n it(\"rewrite member expression with Identifier as property\", () => {\n const obj = {\n x: 3,\n fn() {\n return this.x;\n }\n };\n const func = \"fn\"; \n const spy = sinon.spy();\n \n aexpr(() => obj[func]()).onChange(spy);\n obj.x = 2;\n \n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWithMatch(2);\n });\n it(\"rewrite member expression with StringLiteral as property\", () => {\n const obj = {\n x: 3,\n fn() {\n return this.x;\n }\n };\n const spy = sinon.spy();\n \n aexpr(() => obj[\"fn\"]()).onChange(spy);\n obj.x = 2;\n \n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWithMatch(2);\n });\n it(\"rewrite assignment to member expression with StringLiteral as property\", () => {\n const obj = {\n x: 3,\n fn() {\n return this.x;\n }\n };\n const spy = sinon.spy();\n \n aexpr(() => obj.fn()).onChange(spy);\n obj[\"x\"] = 2;\n \n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWithMatch(2);\n });\n // #TODO: this is not checking, whether changes to a bindExpression are detected!\n it(\"bind expression as expression\", () => {\n const obj = {\n x: 3,\n fn() {\n return this.x;\n }\n };\n const spy = sinon.spy();\n \n aexpr(::obj.fn).onChange(spy);\n obj.x = 2;\n \n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWithMatch(2);\n });\n it(\"this as object of MemberExpression\", () => {\n const obj = {\n x: 3,\n fn2() { return this.x; },\n fn() { return this.fn2(); }\n };\n const spy = sinon.spy();\n \n aexpr(() => obj.fn()).onChange(spy);\n obj.x = 2;\n \n expect(spy).to.be.calledOnce;\n expect(spy).to.be.calledWithMatch(2);\n });\n})\n"]}