Use expect's instanceOf and toHaveProperty methods

.eslintrc.json

@@ -22,6 +22,7 @@
       "files": [
         "packages/*/test/**/*.js",
         "codemods/*/test/**/*.js",
+        "packages/babel-helper-transform-fixture-test-runner/src/helpers.js",
         "test/**/*.js"
       ],
       "env": {

packages/babel-helper-transform-fixture-test-runner/src/helpers.js

@@ -1,13 +1,7 @@
-import assert from "assert";
-
 export function assertNoOwnProperties(obj) {
-  assert.equal(Object.getOwnPropertyNames(obj).length, 0);
+  expect(Object.getOwnPropertyNames(obj)).toHaveLength(0);
 }
 
-export function assertHasOwnProperty() {}
-
-export function assertLacksOwnProperty() {}
-
 export function multiline(arr) {
   return arr.join("\n");
 }

packages/babel-plugin-proposal-decorators/test/fixtures/class-prototype-methods/mutate-descriptor/exec.js

@@ -58,7 +58,7 @@ class Example {
   }
 }
 
-expect(Example.prototype.hasOwnProperty('decoratedProps'));
+expect(Example.prototype).toHaveProperty('decoratedProps');
 expect(Example.prototype.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-prototype-methods/return-descriptor/exec.js

@@ -59,7 +59,7 @@ class Example {
 }
 
 
-expect(Example.prototype.hasOwnProperty('decoratedProps'));
+expect(Example.prototype).toHaveProperty('decoratedProps');
 expect(Example.prototype.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-prototype-properties/mutate-descriptor/exec.js

@@ -44,7 +44,7 @@ class Example {
 
 const inst = new Example();
 
-expect(Example.prototype.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(Example.prototype).toHaveProperty("decoratedProps");
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-prototype-properties/properties-without-initializer/exec.js

@@ -7,5 +7,5 @@ class Example {
 }
 
 let inst = new Example();
-expect(inst.hasOwnProperty("prop")).toBe(true);
+expect(inst).toHaveProperty("prop");
 expect(inst.prop).toBeUndefined();

packages/babel-plugin-proposal-decorators/test/fixtures/class-prototype-properties/return-descriptor/exec.js

@@ -44,7 +44,7 @@ class Example {
 
 const inst = new Example();
 
-expect(Example.prototype.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(Example.prototype).toHaveProperty("decoratedProps");
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-static-methods/mutate-descriptor/exec.js

@@ -58,7 +58,7 @@ class Example {
   }
 }
 
-expect(Example.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(Example).toHaveProperty("decoratedProps");
 expect(Example.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-static-methods/return-descriptor/exec.js

@@ -59,7 +59,7 @@ class Example {
 }
 
 
-expect(Example.hasOwnProperty("decoratedProps"));
+expect(Example).toHaveProperty("decoratedProps");
 expect(Example.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-static-properties/mutate-descriptor/exec.js

@@ -44,7 +44,7 @@ class Example {
 
 const inst = new Example();
 
-expect(Example.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(Example).toHaveProperty("decoratedProps");
 expect(Example.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/class-static-properties/properties-without-initializer/exec.js

@@ -6,5 +6,5 @@ class Example {
   @dec static prop;
 }
 
-expect(Example.hasOwnProperty("prop")).toBeTruthy();
+expect(Example).toHaveProperty("prop");
 expect(Example.prop).toBe(undefined);

packages/babel-plugin-proposal-decorators/test/fixtures/class-static-properties/return-descriptor/exec.js

@@ -44,7 +44,7 @@ class Example {
 
 const inst = new Example();
 
-expect(Example.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(Example).toHaveProperty("decoratedProps");
 expect(Example.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/object-methods/mutate-descriptor/exec.js

@@ -58,7 +58,7 @@ const inst = {
   },
 }
 
-expect(inst.hasOwnProperty('decoratedProps')).toBeTruthy();
+expect(inst).toHaveProperty('decoratedProps');
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/object-methods/return-descriptor/exec.js

@@ -58,7 +58,7 @@ const inst = {
   },
 }
 
-expect(inst.hasOwnProperty('decoratedProps')).toBeTruthy();
+expect(inst).toHaveProperty('decoratedProps');
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/object-properties/mutate-descriptor/exec.js

@@ -43,7 +43,7 @@ const inst = {
 };
 
 
-expect(inst.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(inst).toHaveProperty("decoratedProps");
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-proposal-decorators/test/fixtures/object-properties/return-descriptor/exec.js

@@ -42,7 +42,7 @@ const inst = {
   _: 8,
 };
 
-expect(inst.hasOwnProperty("decoratedProps")).toBeTruthy();
+expect(inst).toHaveProperty("decoratedProps");
 expect(inst.decoratedProps).toEqual([
   "enumconfwrite",
   "enumconf",

packages/babel-plugin-transform-classes/test/fixtures/exec/class-prototype-chain.js

@@ -12,8 +12,8 @@ expect(C.b()).toBe('B.b');
 
 class D extends Object {}
 
-expect(D instanceof Object).toBeTruthy();
+expect(D).toBeInstanceOf(Object);
-expect(D.prototype instanceof Object).toBeTruthy();
+expect(D.prototype).toBeInstanceOf(Object);
 expect(D.keys).toBe(Object.keys);
 
 class E {}

packages/babel-plugin-transform-classes/test/fixtures/exec/return-symbol.js

@@ -5,5 +5,5 @@ class Foo {
 }
 
 const f = new Foo;
-expect(f instanceof Foo).toBeTruthy();
+expect(f).toBeInstanceOf(Foo);
 expect(typeof f).toBe("object");

packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/imported_babel-plugin-transform-builtin-classes/exec.js

@@ -11,8 +11,8 @@ class List extends Array {
   }
 }
 
-expect(new List(1) instanceof List).toBe(true);
+expect(new List(1)).toBeInstanceOf(List);
-expect(new List(2) instanceof Array).toBe(true);
+expect(new List(2)).toBeInstanceOf(Array);
 
 var l = new List(3);
 expect(l).toHaveLength(1);
@@ -27,9 +27,9 @@ class SecondLevel extends List {
   }
 }
 
-expect(new SecondLevel(1) instanceof SecondLevel).toBe(true);
+expect(new SecondLevel(1)).toBeInstanceOf(SecondLevel);
-expect(new SecondLevel(2) instanceof List).toBe(true);
+expect(new SecondLevel(2)).toBeInstanceOf(List);
-expect(new SecondLevel(3) instanceof Array).toBe(true);
+expect(new SecondLevel(3)).toBeInstanceOf(Array);
 
 var s = new SecondLevel(4);
 expect(s).toHaveLength(1);

packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/loose/exec.js

@@ -1,4 +1,4 @@
 class List extends Array {}
 
-expect(new List instanceof List).toBe(true);
+expect(new List).toBeInstanceOf(List);
-expect(new List instanceof Array).toBe(true);
+expect(new List).toBeInstanceOf(Array);

packages/babel-plugin-transform-classes/test/fixtures/extend-builtins/spec/exec.js

@@ -1,4 +1,4 @@
 class List extends Array {}
 
-expect(new List instanceof List).toBe(true);
+expect(new List).toBeInstanceOf(List);
-expect(new List instanceof Array).toBe(true);
+expect(new List).toBeInstanceOf(Array);

packages/babel-plugin-transform-instanceof/test/fixtures/instanceof/instanceof/exec.js

@@ -4,7 +4,7 @@ foo[Symbol.hasInstance]= function () { return true; };
 var bar = {};
 
 expect(bar instanceof foo).toBe(true);
-expect(new String instanceof String).toBe(true);
+expect(new String).toBeInstanceOf(String);
 
 //
 
@@ -21,5 +21,5 @@ Object.defineProperty(Greeting, Symbol.hasInstance, {
 var a = new Greeting("hello");
 var b = new Greeting("world");
 
-expect(a instanceof Greeting).toBe(true);
+expect(a).toBeInstanceOf(Greeting);
-expect(b instanceof Greeting).toBe(false);
+expect(b instanceof Greeting).not.toBe(true);

packages/babel-plugin-transform-parameters/test/fixtures/parameters/default-rest/output.backup.js

@@ -1,22 +0,0 @@
-var a = 1;
-
-function rest() {
-  var b = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : a;
-  expect(b).toBe(1);
-}
-
-rest(undefined, 2);
-
-function rest2() {
-  var b = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : a;
-  expect(arguments.length <= 1 ? undefined : arguments[1]).toBe(2);
-}
-
-rest2(undefined, 2);
-
-function rest3() {
-  var b = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : a;
-  expect(arguments.length <= 1 ? 0 : arguments.length - 1).toBe(1);
-}
-
-rest3(undefined, 2);

packages/babel-plugin-transform-regenerator/test/fixtures/function-sent/example/exec.js

@@ -16,4 +16,4 @@ tally.next(0.1);
 tally.next(0.1);
 tally.next(0.1);
 let last = tally.next("done");
-expect(last.value).toBe(0.30000000000000004);
+expect(last.value).toBeCloseTo(0.3, 10);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/empty-named-class.js

@@ -2,4 +2,4 @@ class Foo {
 }
 
 expect(new Foo().constructor).toBe(Foo);
-expect(new Foo() instanceof Foo).toBeTruthy();
+expect(new Foo()).toBeInstanceOf(Foo);

packages/babel-preset-es2015/test/fixtures/traceur/ArrayExtras/From.js

@@ -108,7 +108,7 @@ class MyArray extends Array {
 }
 
 var ma = MyArray.from(['a', 'b']);
-expect(ma instanceof MyArray).toBe(true);
+expect(ma).toBeInstanceOf(MyArray);
 expect(constructorCounter).toBe(1);
 expect(lengthSetCounter).toBe(1);
 expect(lengthGetCounter).toBe(0);
@@ -146,7 +146,7 @@ var ma3 = new MyArray3(2);
 ma3[0] = 'a';
 ma3[1] = 'b';
 ma = MyArray2.from(ma3);
-expect(ma instanceof MyArray2).toBe(true);
+expect(ma).toBeInstanceOf(MyArray2);
 expect(constructorCounter).toBe(2);
 expect(lengthSetCounter).toBe(1);
 expect(lengthGetCounter).toBe(0);

packages/babel-preset-es2015/test/fixtures/traceur/ArrayExtras/Of.js

@@ -6,12 +6,12 @@ expect(Array.of.length).toBe(0);
 //should return an array from arguments
 arr = Array.of(1, 'a', 3);
 expect(arr).toEqual([1, 'a', 3]);
-// expect(arr instanceof Array).toBe(true);
+// expect(arr).toBeInstanceof(Array);
 
 //should work with no arguments
 arr = Array.of();
 expect(arr).toEqual([]);
-// expect(arr instanceof Array).toBe(true);
+// expect(arr).toBeInstanceof(Array);
 
 //should work with sub-classed array
 class MyArray extends Array {}
@@ -20,7 +20,7 @@ arr = MyArray.of(4, 'b');
 expect(arr[0]).toBe(4);
 expect(arr[1]).toBe('b');
 expect(arr).toHaveLength(2);
-// expect(arr instanceof MyArray).toBe(true);
+// expect(arr).toBeInstanceof(MyArray);
 
 //should call with exotic array
 class ExoticArray {
@@ -34,4 +34,4 @@ expect(arr[1]).toBe('c');
 expect(arr[2]).toBe(6);
 expect(arr[3]).toBe('d');
 expect(arr).toHaveLength(4);
-expect(arr instanceof ExoticArray).toBe(true);
+expect(arr).toBeInstanceOf(ExoticArray);

packages/babel-preset-es2015/test/fixtures/traceur/AsyncFunctions/Prototype.js

@@ -4,4 +4,4 @@ async function f() {
 }
 
 expect(Object.getPrototypeOf(f)).toBe(Function.prototype);
-expect(f() instanceof Promise).toBe(true);
+expect(f()).toBeInstanceOf(Promise);

packages/babel-preset-es2015/test/fixtures/traceur/Classes/.ClassMethodInheritance.js

@@ -20,4 +20,4 @@ class E {}
 
 expect(Object.getPrototypeOf(E)).toBe(Function.prototype);
 expect(Object.getPrototypeOf(E.prototype)).toBe(Object.prototype);
-expect('keys' in E).toBe(false);
+expect(E).not.toHaveProperty('keys');

packages/babel-preset-es2015/test/fixtures/traceur/Classes/ConstructorMember.js

@@ -12,7 +12,7 @@ class DerivedConstructorMember extends ConstructorMember {
 
 var cm = new ConstructorMember;
 expect(cm.constructor).toBe(ConstructorMember.prototype.constructor);
-expect(ConstructorMember.prototype.hasOwnProperty('constructor')).toBe(true);
+expect(ConstructorMember.prototype).toHaveProperty('constructor');
 
 for (var key in ConstructorMember) {
   expect('constructor should not be enumerable').not.toBe('constructor');
@@ -20,7 +20,7 @@ for (var key in ConstructorMember) {
 
 var dcm = new DerivedConstructorMember;
 expect(dcm.constructor).toBe(DerivedConstructorMember.prototype.constructor);
-expect(DerivedConstructorMember.prototype.hasOwnProperty('constructor')).toBe(true);
+expect(DerivedConstructorMember.prototype).toHaveProperty('constructor');
 
 for (var key in DerivedConstructorMember) {
   expect('constructor should not be enumerable').not.toBe('constructor');

packages/babel-preset-es2015/test/fixtures/traceur/Classes/EmptyClass.js

@@ -20,10 +20,10 @@ for (var element in Empty) {
 var e2 = new Empty();
 expect(e).not.toBe(e2);
 
-expect(e instanceof Empty).toBe(true);
+expect(e).toBeInstanceOf(Empty);
-expect(e instanceof EmptyB).toBe(false);
+expect(e).not.toBeInstanceOf(EmptyB);
 
 var b = new EmptyB();
 
-expect(b instanceof Empty).toBe(true);
+expect(b).toBeInstanceOf(Empty);
-expect(b instanceof EmptyB).toBe(true);
+expect(b).toBeInstanceOf(EmptyB);

packages/babel-preset-es2015/test/fixtures/traceur/Classes/ExtendCoverFormals.js

@@ -6,5 +6,5 @@ class D extends (x, y) {
 
 }
 
-expect(new D() instanceof C).toBe(true);
+expect(new D()).toBeInstanceOf(C);
-expect(new D() instanceof D).toBe(true);
+expect(new D()).toBeInstanceOf(D);

packages/babel-preset-es2015/test/fixtures/traceur/Classes/ExtendStrange.js

@@ -1,8 +1,8 @@
 class C extends null {}
 
 var c = new C;
-expect(c instanceof C).toBe(true);
+expect(c).toBeInstanceOf(C);
-expect(c instanceof Object).toBe(false);
+expect(c).toBeInstanceOf(Object);
 
 // Closure testing framework tries to toString the object and fails.
 expect(Object.getPrototypeOf(c)).toBe(C.prototype);

packages/babel-preset-es2015/test/fixtures/traceur/Classes/Inheritance.js

@@ -4,6 +4,6 @@ class SimpleDerived extends SimpleBase {}
 // ----------------------------------------------------------------------------
 
 var derived = new SimpleDerived();
-expect(derived instanceof SimpleDerived).toBe(true);
+expect(derived).toBeInstanceOf(SimpleDerived);
-expect(derived instanceof SimpleBase).toBe(true);
+expect(derived).toBeInstanceOf(SimpleBase);
-expect(derived instanceof Object).toBe(true);
+expect(derived).toBeInstanceOf(Object);

packages/babel-preset-es2015/test/fixtures/traceur/Classes/InheritanceFromMemberExpression.js

@@ -25,7 +25,9 @@ var a = new MemberExprBase('w value');
 var pa = Object.getPrototypeOf(a);
 var ppa = Object.getPrototypeOf(pa);
 
-assertHasOwnProperty(a, 'yyy', 'w', 'z');
+expect(a).toHaveProperty('yyy');
-assertLacksOwnProperty(a, 'x');
+expect(a).toHaveProperty('w');
-assertHasOwnProperty(pa, 'constructor');
+expect(a).toHaveProperty('z');
-assertHasOwnProperty(ppa, 'x', 'constructor');
+expect(a).not.toHaveProperty('x');
+expect(pa).toHaveProperty('constructor');
+expect(ppa).toHaveProperty('constructor');

packages/babel-preset-es2015/test/fixtures/traceur/Classes/InheritanceFromNonclass.js

@@ -12,6 +12,6 @@ class NoClassB extends noClassA {
 // ----------------------------------------------------------------------------
 
 var b = new NoClassB;
-expect(b instanceof noClassA).toBe(true);
+expect(b).toBeInstanceOf(noClassA);
 expect('ma').toBe(b.ma());
 expect('mb ma').toBe(b.mb());

packages/babel-preset-es2015/test/fixtures/traceur/Classes/MethodInheritance.js

@@ -24,9 +24,12 @@ assertNoOwnProperties(a);
 assertNoOwnProperties(b);
 assertNoOwnProperties(c);
 
-assertHasOwnProperty(pa, 'ma');
+expect(pa).toHaveProperty('ma');
-assertLacksOwnProperty(pa, 'mb', 'mc');
+expect(pa).not.toHaveProperty('mb');
-assertHasOwnProperty(pb, 'mb');
+expect(pa).not.toHaveProperty('mc');
-assertLacksOwnProperty(pb, 'ma', 'mc');
+expect(pb).toHaveProperty('mb');
-assertHasOwnProperty(pc, 'mc');
+expect(pb).not.toHaveProperty('ma');
-assertLacksOwnProperty(pc, 'ma', 'mb');
+expect(pb).not.toHaveProperty('mc');
+expect(pc).toHaveProperty('mc');
+expect(pc).not.toHaveProperty('ma');
+expect(pc).not.toHaveProperty('mb');

packages/babel-preset-es2015/test/fixtures/traceur/Classes/SuperMissing.js

@@ -35,6 +35,6 @@ try {
 }
 
 expect(actualF).toBe(expectedF);
-expect(expectedM instanceof TypeError).toBe(true);
+expect(expectedM).toBeInstanceOf(TypeError);
-expect(actualM instanceof TypeError).toBe(true);
+expect(actualM).toBeInstanceOf(TypeError);
 expect(Object.getPrototypeOf(actualM)).toBe(Object.getPrototypeOf(expectedM));

packages/babel-preset-es2015/test/fixtures/traceur/Misc/ObjectAssign.js

@@ -4,7 +4,7 @@ var assigned = Object.assign(target, source);
 
 // ----------------------------------------------------------------------------
 
-expect(Object.hasOwnProperty("assign")).toBe(true);
+expect(Object).toHaveProperty("assign");
 expect(assigned.a).toBe(source.a);
 expect(assigned.b).toBe(target.b);
 expect(assigned.c).toBe(source.c);

packages/babel-preset-es2015/test/fixtures/traceur/Misc/PromiseThrowInResolve.js

@@ -9,7 +9,7 @@ throwInResolve.then((v) => {
 }).catch(function(ex) {
 	// When catch() is used in testing, these asserts would
 	// not be called, just the done() to avoid timeout.
-  expect(ex instanceof Error).toBe(true);
+  expect(ex).toBeInstanceOf(Error);
   expect(ex.toString()).toEqual(expect.stringContaining(message));
   done();
 }).catch(done);

packages/babel-preset-es2015/test/fixtures/traceur/Modules/resources/default-class.js

@@ -4,4 +4,4 @@ export default class C {
   }
 }
 
-expect(C instanceof Function).toBe(true);
+expect(C).toBeInstanceOf(Function);

packages/babel-preset-es2015/test/fixtures/traceur/Modules/resources/default-function.js

@@ -2,4 +2,4 @@ export default function f() {
   return 123;
 }
 
-expect(f instanceof Function).toBe(true);
+expect(f).toBeInstanceOf(Function);

packages/babel-preset-es2015/test/fixtures/traceur/NumericLiteral/Simple.js

@@ -84,18 +84,17 @@
     static set 0O13(v) {}
   }
 
-  expect(C.prototype.hasOwnProperty('0')).toBe(true);
+  expect(C.prototype).toHaveProperty('0');
-  expect(C.prototype.hasOwnProperty('1')).toBe(true);
+  expect(C.prototype).toHaveProperty('1');
-  expect(C.prototype.hasOwnProperty('2')).toBe(true);
+  expect(C.prototype).toHaveProperty('2');
-  expect(C.prototype.hasOwnProperty('6')).toBe(true);
+  expect(C.prototype).toHaveProperty('6');
-  expect(C.prototype.hasOwnProperty('7')).toBe(true);
+  expect(C.prototype).toHaveProperty('7');
-  expect(C.prototype.hasOwnProperty('8')).toBe(true);
+  expect(C.prototype).toHaveProperty('8');
-
-  expect(C.hasOwnProperty('3')).toBe(true);
-  expect(C.hasOwnProperty('4')).toBe(true);
-  expect(C.hasOwnProperty('5')).toBe(true);
-  expect(C.hasOwnProperty('9')).toBe(true);
-  expect(C.hasOwnProperty('10')).toBe(true);
-  expect(C.hasOwnProperty('11')).toBe(true);
 
+  expect(C).toHaveProperty('3');
+  expect(C).toHaveProperty('4');
+  expect(C).toHaveProperty('5');
+  expect(C).toHaveProperty('9');
+  expect(C).toHaveProperty('10');
+  expect(C).toHaveProperty('11');
 })();

packages/babel-preset-es2015/test/fixtures/traceur/PropertyMethodAssignment/PropertyMethodAssignment.js

@@ -35,7 +35,7 @@ expect(Object.keys(object)).toEqual([
 ]);
 
 function assertMethod(object, name) {
-  expect(object.hasOwnProperty(name)).toBe(true);
+  expect(object).toHaveProperty(name);
   var descriptor = Object.getOwnPropertyDescriptor(object, name);
   expect(typeof descriptor).toBe('object');
   expect(descriptor.enumerable).toBe(true);

packages/babel-preset-es2015/test/fixtures/traceur/Scope/BlockBinding2.js

@@ -10,6 +10,6 @@ for (let x in obj) {
 
 // ----------------------------------------------------------------------------
 
-expect(result[0]()).toBe('hello a');;
+expect(result[0]()).toBe('hello a');
-expect(result[1]()).toBe('hello b');;
+expect(result[1]()).toBe('hello b');
-expect(result[2]()).toBe('hello c');;
+expect(result[2]()).toBe('hello c');

packages/babel-preset-es2015/test/fixtures/traceur/Spread/Class.js

@@ -14,4 +14,4 @@ var object = new SpreadTestClass(...[0, 1]);
 expect(object.x).toBe(0);
 expect(object.y).toBe(1);
 expect(object.self).toBe(object);
-expect(object instanceof object.SpreadTestClass).toBe(true);
+expect(object).toBeInstanceOf(object.SpreadTestClass);

packages/babel-preset-es2015/test/fixtures/traceur/Spread/New2.js

@@ -18,6 +18,6 @@ var object = new F(0, ...[1, 2]);
 expect(object.x).toBe(0);
 expect(object.y).toBe(1);
 expect(object.z).toBe(2);
-expect(object instanceof object.F).toBe(false);
+expect(object).not.toBeInstanceOf(object.F);
-expect(object instanceof object.G).toBe(true);
+expect(object).toBeInstanceOf(object.G);
-expect(object.f instanceof object.F).toBe(true);
+expect(object.f).toBeInstanceOf(object.F);

packages/babel-preset-es2015/test/fixtures/traceur/Symbol/Object.js

@@ -5,7 +5,7 @@ expect(object[s]).toBe(42);
 // Native Symbol throws for ToString.
 // expect(object[s + '']).toBeUndefined();
 expect(Object.getOwnPropertyNames(object)).toEqual([]);
-expect(object.hasOwnProperty(s)).toBe(true);
+expect(object).toHaveProperty(s);
 
 expect(object[s] -= 10).toBe(32);
 expect(object[s] /= 2).toBe(16);

packages/babel-preset-es2015/test/fixtures/traceur/Symbol/ObjectModel.js

@@ -1,7 +1,7 @@
 var s = Symbol('s');
 expect(typeof s).toBe('symbol');
 expect(s.constructor).toBe(Symbol);
-expect(s instanceof Symbol).toBe(false);
+expect(s).toBeInstanceOf(Symbol);
 
 expect(() => {
 	new Symbol;

packages/babel-preset-es2015/test/fixtures/traceur/Yield/ObjectModel.js

@@ -10,7 +10,7 @@ expect(GeneratorFunctionPrototype.prototype).toBe(f.prototype.__proto__);
 expect(GeneratorFunctionPrototype.__proto__).toBe(Function.prototype);
 
 var g = f();
-expect(g instanceof f).toBe(true);
+expect(g).toBeInstanceOf(f);
 
 expect(g.__proto__).toBe(f.prototype);
 
@@ -31,7 +31,7 @@ function* f2() {
 
 expect(f.__proto__).toBe(f2.__proto__);
 
-expect(f.hasOwnProperty('constructor')).toBe(false);
+expect(f).not.toHaveProperty('constructor');
 expect(f.__proto__.constructor.name).toBe('GeneratorFunction');
 
 // Intentionally at the end to test hoisting.

packages/babel-preset-es2015/test/fixtures/traceur/Yield/OverrideGenerator.js

@@ -11,4 +11,4 @@ var g = f2();
 expect(g.next()).toEqual({value: 1, done: false});
 expect(g.next()).toEqual({value: undefined, done: true});
 
-expect(g instanceof f2).toBe(true);
+expect(g).toBeInstanceOf(f2);