Migrate babel-preset-es2015 and -next-target tests to use jest expect

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

@@ -11,5 +11,3 @@ export function assertLacksOwnProperty() {}
 export function multiline(arr) {
   return arr.join("\n");
 }
-
-export const assertArrayEquals = assert.deepEqual;

packages/babel-plugin-transform-modules-commonjs/test/fixtures/source-map/exec.js

@@ -28,9 +28,5 @@ tests.forEach(function (code) {
   });
 
   // Should create mapping
-  assert.notEqual(
-    res.map.mappings,
-    '',
-    'expected to generate sourcemap for: ' + code
-  );
+  expect(res.map.mappings).not.toBe('');;
 });

packages/babel-plugin-transform-new-target/test/fixtures/exec/class-extended.js

@@ -17,6 +17,6 @@ class Bar extends Foo {
 new Foo;
 new Bar;
 
-assert.equal(targets[0], Foo);
-assert.equal(targets[1], Bar);
-assert.equal(targets[2], Bar);
+expect(targets[0]).toBe(Foo);
+expect(targets[1]).toBe(Bar);
+expect(targets[2]).toBe(Bar);

packages/babel-plugin-transform-new-target/test/fixtures/exec/class.js

@@ -9,4 +9,4 @@ class Foo {
 
 new Foo;
 
-assert.equal(targets[0], Foo);
+expect(targets[0]).toBe(Foo);

packages/babel-plugin-transform-new-target/test/fixtures/exec/function-class-extended.js

@@ -12,5 +12,5 @@ function Bar() {
 new Foo;
 new Bar();
 
-assert.equal(targets[0], Foo);
-assert.equal(targets[1], undefined);
+expect(targets[0]).toBe(Foo);
+expect(targets[1]).toBeUndefined();

packages/babel-plugin-transform-new-target/test/fixtures/exec/function-class.js

@@ -7,4 +7,4 @@ function Foo() {
 
 new Foo;
 
-assert.equal(targets[0], Foo);
+expect(targets[0]).toBe(Foo);

packages/babel-plugin-transform-new-target/test/fixtures/exec/function.js

@@ -8,5 +8,5 @@ function foo() {
 foo();
 foo.call({});
 
-assert.equal(targets[0], undefined);
-assert.equal(targets[1], undefined);
+expect(targets[0]).toBeUndefined();
+expect(targets[1]).toBeUndefined();

packages/babel-plugin-transform-object-super/test/fixtures/object-super/simple.js

@@ -12,4 +12,4 @@ var b = {
 
 Object.setPrototypeOf(b, a);
 
-assert.equal(b.name(), "Suyash Verma");
+expect(b.name()).toBe("Suyash Verma");

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/arguments-refers-to-parent-function.js

@@ -26,32 +26,12 @@ function makeArgumentsReturner() {
 }
 
 // i.e. 2 * 3 * 4 == 24, not 16 (4 * 4)
-assert.equal(
-  makeMultiplier(2, 3)(4),
-  24,
-  'ensure `arguments` is hoisted out to the first non-arrow scope'
-);
+expect(makeMultiplier(2, 3)(4)).toBe(24);
 
-assert.deepEqual(
-  toArray(1, 2, 3),
-  [1, 2, 3],
-  'ensure `arguments` is hoisted out to the first non-arrow scope'
-);
+expect(toArray(1, 2, 3)).toEqual([1, 2, 3]);
 
-assert.equal(
-  returnDotArguments({arguments: 1}),
-  1,
-  'member accesses with `arguments` property should not be replaced'
-);
+expect(returnDotArguments({arguments: 1})).toBe(1);
 
-assert.deepEqual(
-  returnArgumentsObject(),
-  {arguments: 1},
-  'object property keys named `arguments` should not be replaced'
-);
+expect(returnArgumentsObject()).toEqual({arguments: 1});
 
-assert.deepEqual(
-  makeArgumentsReturner()(1, 2, 3),
-  [1, 2, 3],
-  'arguments should not be hoisted from inside non-arrow functions'
-);
+expect(makeArgumentsReturner()(1, 2, 3)).toEqual([1, 2, 3]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/empty-arrow-function.js

@@ -1,2 +1,2 @@
 var empty = () => {};
-assert.equal(empty(), undefined);
+expect(empty()).toBeUndefined();

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/handles-nested-context-bindings.js

@@ -8,5 +8,5 @@ var obj = {
   }
 };
 
-assert.strictEqual(obj.method()()(), obj);
-assert.strictEqual(obj.method2()()(), obj);
+expect(obj.method()()()).toBe(obj);
+expect(obj.method2()()()).toBe(obj);

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/no-parens-for-low-precedence-expression-body.js

@@ -1,2 +1,2 @@
 var square = x => x * x;
-assert.equal(square(4), 16);
+expect(square(4)).toBe(16);

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/object-literal-needs-parens.js

@@ -1,2 +1,2 @@
 var keyMaker = val => ({ key: val });
-assert.deepEqual(keyMaker(9), { key: 9 });
+expect(keyMaker(9)).toEqual({ key: 9 });

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/only-lexical-this-not-dynamic-this.js

@@ -4,4 +4,4 @@ var obj = {
   }
 };
 
-assert.strictEqual(obj.method()(), obj);
+expect(obj.method()()).toBe(obj);

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/passed-to-function.js

@@ -1,2 +1,2 @@
 var odds = [0, 2, 4].map(v => v + 1);
-assert.deepEqual(odds, [1, 3, 5]);
+expect(odds).toEqual([1, 3, 5]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-arrow-functions/single-param-does-not-need-parens.js

@@ -1,2 +1,2 @@
 var identity = x => x;
-assert.equal(identity(1), 1);
+expect(identity(1)).toBe(1);

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

@@ -20,10 +20,10 @@ var Dog = class extends Animal {
   }
 };
 
-assert.equal(new Dog().sayHi(), 'Hi, I am a dog. WOOF!');
-assert.equal(Dog.getName(), 'Animal/Dog');
+expect(new Dog().sayHi()).toBe('Hi, I am a dog. WOOF!');
+expect(Dog.getName()).toBe('Animal/Dog');
 
 var count = 0;
 var Cat = class extends (function(){ count++; return Animal; })() {};
 
-assert.equal(count, 1);
+expect(count).toBe(1);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/call-super-function.js

@@ -18,4 +18,4 @@ class Horse extends Animal {
   }
 }
 
-assert.equal(new Horse().sayHi(), 'WAT?!');
+expect(new Horse().sayHi()).toBe('WAT?!');

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

@@ -1,9 +1,6 @@
 var Person = (class Person {});
-assert.equal(typeof Person, 'function');
+expect(typeof Person).toBe('function');
 
-assert.equal(
-  (function(){ return (class Person {}); })().name,
-  'Person'
-);
+expect((function(){ return (class Person {}); })().name).toBe('Person');
 
-assert.equal(typeof (class {}), 'function');
+expect(typeof (class {})).toBe('function');

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

@@ -12,4 +12,4 @@ class Dog extends Animal {
   }
 }
 
-assert.equal(new Dog().sayHi(), 'Hi, I am a dog. WOOF!');
+expect(new Dog().sayHi()).toBe('Hi, I am a dog. WOOF!');

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/class-with-constructor.js

@@ -8,7 +8,7 @@ class Multiplier {
   }
 }
 
-assert.equal(new Multiplier().n, 1);
-assert.equal(new Multiplier(6).n, 6);
-assert.equal(new Multiplier().multiply(), 1);
-assert.equal(new Multiplier(2).multiply(3), 6);
+expect(new Multiplier().n).toBe(1);
+expect(new Multiplier(6).n).toBe(6);
+expect(new Multiplier().multiply()).toBe(1);
+expect(new Multiplier(2).multiply(3)).toBe(6);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/class-with-method-declaration.js

@@ -7,4 +7,4 @@ class Person {
 var me = new Person();
 me.firstName = 'Brian';
 me.lastName = 'Donovan';
-assert.equal(me.getName(), 'Brian Donovan');
+expect(me.getName()).toBe('Brian Donovan');

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

@@ -1,5 +1,5 @@
 class Foo {
 }
 
-assert.equal(new Foo().constructor, Foo, 'Foo instances should have Foo as constructor');
-assert.ok(new Foo() instanceof Foo, 'Foo instances should be `instanceof` Foo');
+expect(new Foo().constructor).toBe(Foo);
+expect(new Foo() instanceof Foo).toBeTruthy();

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/enumerable.js

@@ -16,5 +16,5 @@ for (var key in point) {
   keys.push(key);
 }
 
-assert.equal(point.toString(), '(1, 2)');
-assert.deepEqual(keys.sort(), ['x', 'y']);
+expect(point.toString()).toBe('(1, 2)');
+expect(keys.sort()).toEqual(['x', 'y']);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/explicit-super-in-constructor.js

@@ -11,5 +11,5 @@ class ZeroPoint extends Point {
   }
 }
 
-assert.equal(new ZeroPoint().x, 0);
-assert.equal(new ZeroPoint().y, 0);
+expect(new ZeroPoint().x).toBe(0);
+expect(new ZeroPoint().y).toBe(0);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/extends-null.js

@@ -1,4 +1,4 @@
 class Obj extends null {}
 
-assert.strictEqual(Obj.toString, Function.toString);
-assert.strictEqual(new Obj().toString, undefined);
+expect(Obj.toString).toBe(Function.toString);
+expect(new Obj().toString).toBeUndefined();

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/getter-setter-super.js

@@ -32,6 +32,6 @@ class Cat extends Animal {
 
 var cat = new Cat();
 
-assert.equal(cat.sound, 'I am a cat. MEOW!');
+expect(cat.sound).toBe('I am a cat. MEOW!');
 cat.name = 'Nyan';
-assert.equal(cat.name, 'Nyan Cat');
+expect(cat.name).toBe('Nyan Cat');

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/getter-setter.js

@@ -16,13 +16,13 @@ class Person {
 }
 
 var mazer = new Person('Mazer', 'Rackham');
-assert.equal(mazer.name, 'Mazer Rackham');
+expect(mazer.name).toBe('Mazer Rackham');
 mazer.name = 'Ender Wiggin';
-assert.equal(mazer.firstName, 'Ender');
-assert.equal(mazer.lastName, 'Wiggin');
+expect(mazer.firstName).toBe('Ender');
+expect(mazer.lastName).toBe('Wiggin');
 
 var forLoopProperties = [];
 for (var key in mazer) {
   forLoopProperties.push(key);
 }
-assert.ok(forLoopProperties.indexOf('name') === -1, 'getters/setters should be unenumerable');
+expect(forLoopProperties).not.toEqual(expect.stringContaining('name'));

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/method-declaration-with-arguments.js

@@ -4,4 +4,4 @@ class Tripler {
   }
 }
 
-assert.equal(new Tripler().triple(2), 6);
+expect(new Tripler().triple(2)).toBe(6);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/methods-are-writable.js

@@ -9,4 +9,4 @@ class Foo {
 var foo = new Foo();
 foo.foo = function() { value = 2; };
 foo.foo();
-assert.equal(value, 2);
+expect(value).toBe(2);

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/methods-with-rest-params.js

@@ -24,5 +24,5 @@ class ArrayLike {
 }
 
 var joiner = new Joiner(' & ');
-assert.equal(joiner.join(4, 5, 6), '4 & 5 & 6');
-assert.equal(new ArrayLike('a', 'b')[1], 'b');
+expect(joiner.join(4, 5, 6)).toBe('4 & 5 & 6');
+expect(new ArrayLike('a', 'b')[1]).toBe('b');

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/static-getter.js

@@ -9,4 +9,4 @@ class Point {
   }
 }
 
-assert.deepEqual(Point.ORIGIN, new Point(0, 0));
+expect(Point.ORIGIN).toEqual(new Point(0, 0));

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/static-method.js

@@ -16,15 +16,15 @@ class MegaTripler extends Tripler {
 
 var tripler = new Tripler();
 
-assert.equal(Tripler.triple(), 3);
-assert.equal(Tripler.triple(2), 6);
-assert.equal(tripler.triple, undefined);
+expect(Tripler.triple()).toBe(3);
+expect(Tripler.triple(2)).toBe(6);
+expect(tripler.triple).toBeUndefined();
 
-assert.equal(Tripler.toString(), '3' + Object.toString.call(Tripler) + '3');
+expect(Tripler.toString()).toBe('3' + Object.toString.call(Tripler) + '3');
 
 var mega = new MegaTripler();
 
-assert.equal(MegaTripler.triple(2), 36);
-assert.equal(mega.triple, undefined);
+expect(MegaTripler.triple(2)).toBe(36);
+expect(mega.triple).toBeUndefined();
 
-assert.equal(MegaTripler.toString(), '3' + Object.toString.call(MegaTripler) + '3');
+expect(MegaTripler.toString()).toBe('3' + Object.toString.call(MegaTripler) + '3');

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/static-setter.js

@@ -1,6 +1,6 @@
 class Person {
   static set DB(value) {
-    assert.equal(value, 'mysql');
+    expect(value).toBe('mysql');
   }
 }
 

packages/babel-preset-es2015/test/fixtures/esnext/es6-classes/super-change-proto.js

@@ -18,4 +18,4 @@ class Derived extends Base {
 }
 
 new Derived().p();
-assert.equal(log, '[Derived][Base][OtherBase]');
+expect(log).toBe('[Derived][Base][OtherBase]');

packages/babel-preset-es2015/test/fixtures/esnext/es6-computed-properties/accessor.js

@@ -5,4 +5,4 @@ var foo = {
   set [x](v) { this._y = v; }
 };
 
-assert.equal((foo.y = 10, foo.y), 10);
+expect((foo.y = 10, foo.y)).toBe(10);

packages/babel-preset-es2015/test/fixtures/esnext/es6-computed-properties/method.js

@@ -1,3 +1,3 @@
 var x = 'y';
-assert.equal({[x]: function() { return 10; }}.y(), 10);
-assert.equal({[x + 'y']() { return 10; }}.yy(), 10);
+expect({[x]: function() { return 10; }}.y()).toBe(10);
+expect({[x + 'y']() { return 10; }}.yy()).toBe(10);

packages/babel-preset-es2015/test/fixtures/esnext/es6-computed-properties/nested.js

@@ -1,4 +1,4 @@
 var x = 'y';
 var foo = {[x]: 10, z: {[x]: 10}};
-assert.equal(foo.y + foo.z.y, 20);
-assert.equal({[x]: {[x]: {[x]: 10}}}.y.y.y, 10);
+expect(foo.y + foo.z.y).toBe(20);
+expect({[x]: {[x]: {[x]: 10}}}.y.y.y).toBe(10);

packages/babel-preset-es2015/test/fixtures/esnext/es6-computed-properties/simple.js

@@ -1,3 +1,3 @@
 var x = 'y';
-assert.equal({[x]: 10}.y, 10);
-assert.equal({[x + 'y']: 10}.yy, 10);
+expect({[x]: 10}.y).toBe(10);
+expect({[x + 'y']: 10}.yy).toBe(10);

packages/babel-preset-es2015/test/fixtures/esnext/es6-default-parameters/arity.js

@@ -1,3 +1,3 @@
-assert.equal((function(a){}).length, 1);
-assert.equal((function(a=5){}).length, 0);
-assert.equal((function(a, b, c=5){}).length, 2);
+expect((function(a){})).toHaveLength(1);
+expect((function(a=5){})).toHaveLength(0);
+expect((function(a, b, c=5){})).toHaveLength(2);

packages/babel-preset-es2015/test/fixtures/esnext/es6-default-parameters/arrow-function.js

@@ -2,7 +2,7 @@ function makeMultiplier(x=1) {
   return (y=1) => x * y;
 }
 
-assert.equal(makeMultiplier()(), 1);
-assert.equal(makeMultiplier(2)(3), 6);
-assert.deepEqual([1, 2, 3].map(makeMultiplier(2)), [2, 4, 6]);
-assert.deepEqual([undefined, null, 0].map(makeMultiplier(2)), [2, 0, 0]);
+expect(makeMultiplier()()).toBe(1);
+expect(makeMultiplier(2)(3)).toBe(6);
+expect([1, 2, 3].map(makeMultiplier(2))).toEqual([2, 4, 6]);
+expect([undefined, null, 0].map(makeMultiplier(2))).toEqual([2, 0, 0]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-default-parameters/null-vs-undefined.js

@@ -2,4 +2,4 @@ function foo(x=5, y=6) {
   return [x, y];
 }
 
-assert.deepEqual(foo(undefined, null), [5, null]);
+expect(foo(undefined, null)).toEqual([5, null]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-default-parameters/scope.js

@@ -5,7 +5,7 @@ function call(fn, context=this) {
 var context = {a: 99};
 
 // use the default parameter
-assert.strictEqual(call.call(context, function(){ return this.a; }), 99);
+expect(call.call(context, function(){ return this.a; })).toBe(99);
 
 // explicitly provide the default parameter value
-assert.strictEqual(call(function(){ return this.a; }, context), 99);
+expect(call(function(){ return this.a; }, context)).toBe(99);

packages/babel-preset-es2015/test/fixtures/esnext/es6-default-parameters/simple-function.js

@@ -1,4 +1,4 @@
 function foo(x=5) {
   return x;
 }
-assert.equal(foo(), 5);
+expect(foo()).toBe(5);

packages/babel-preset-es2015/test/fixtures/esnext/es6-object-concise/method-arguments.js

@@ -4,4 +4,4 @@ var a = {
   }
 };
 
-assert.strictEqual(a.echo(1), 1);
+expect(a.echo(1)).toBe(1);

packages/babel-preset-es2015/test/fixtures/esnext/es6-object-concise/method-context.js

@@ -5,5 +5,5 @@ var a = {
 };
 
 var context = {};
-assert.strictEqual(a.b(), a);
-assert.strictEqual(a.b.call(context), context);
+expect(a.b()).toBe(a);
+expect(a.b.call(context)).toBe(context);

packages/babel-preset-es2015/test/fixtures/esnext/es6-object-concise/method-has-name.js

@@ -4,4 +4,4 @@ var a = {
   }
 };
 
-assert.equal(a.b.name, 'b');
+expect(a.b.name).toBe('b');

packages/babel-preset-es2015/test/fixtures/esnext/es6-object-concise/method-is-not-in-scope-inside.js

@@ -6,4 +6,4 @@ var a = {
   }
 };
 
-assert.equal(a.b(), 1);
+expect(a.b()).toBe(1);

packages/babel-preset-es2015/test/fixtures/esnext/es6-object-concise/method.js

@@ -4,4 +4,4 @@ var a = {
   }
 };
 
-assert.equal(a.b(), 'c');
+expect(a.b()).toBe('c');

packages/babel-preset-es2015/test/fixtures/esnext/es6-rest-parameters/arrow-fn.js

@@ -2,4 +2,4 @@ var join = (joinStr, ...items) => {
   return items.join(joinStr);
 };
 
-assert.deepEqual(join(' ', 'a', 'b', 'c'), 'a b c');
+expect(join(' ', 'a', 'b', 'c')).toBe('a b c');

packages/babel-preset-es2015/test/fixtures/esnext/es6-rest-parameters/declaration.js

@@ -2,4 +2,4 @@ function join(joinStr, ...items) {
   return items.join(joinStr);
 }
 
-assert.deepEqual(join(' ', 'a', 'b', 'c'), 'a b c');
+expect(join(' ', 'a', 'b', 'c')).toBe('a b c');

packages/babel-preset-es2015/test/fixtures/esnext/es6-rest-parameters/rest.js

@@ -2,4 +2,4 @@ var join = function(joinStr, ...items) {
   return items.join(joinStr);
 };
 
-assert.deepEqual(join(' ', 'a', 'b', 'c'), 'a b c');
+expect(join(' ', 'a', 'b', 'c')).toBe('a b c');

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/arguments-as-array.js

@@ -2,5 +2,5 @@ function arrayOf() {
   return [...arguments];
 }
 
-assert.equal(Object.prototype.toString.call(arrayOf()), '[object Array]');
-assert.deepEqual(arrayOf(1, 2, 3), [1, 2, 3]);
+expect(Object.prototype.toString.call(arrayOf())).toBe('[object Array]');
+expect(arrayOf(1, 2, 3)).toEqual([1, 2, 3]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/array-literal.js

@@ -1,3 +1,3 @@
 var names = ['Brian', 'Madeline'];
-assert.deepEqual(['Thomas', ...names], ['Thomas', 'Brian', 'Madeline']);
-assert.deepEqual([1, 2, ...[3, 4, 5]], [1, 2, 3, 4, 5]);
+expect(['Thomas', ...names]).toEqual(['Thomas', 'Brian', 'Madeline']);
+expect([1, 2, ...[3, 4, 5]]).toEqual([1, 2, 3, 4, 5]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/call-with-array-literal.js

@@ -2,4 +2,4 @@ function sum(...numbers) {
   return numbers.reduce(function(sum, n) { return n + sum; }, 0);
 }
 
-assert.equal(sum(4, 5, ...[10, 20, 30]), 69);
+expect(sum(4, 5, ...[10, 20, 30])).toBe(69);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/inside-function-expression.js

@@ -7,4 +7,4 @@ var object = {
 };
 
 object.append(1, 2, ...[3, 4]);
-assert.deepEqual(object.list, [1, 2, 3, 4]);
+expect(object.list).toEqual([1, 2, 3, 4]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/iterator.js

@@ -13,4 +13,4 @@ var obj = {
   }
 };
 
-assert.deepEqual([3, 2, 1], [...obj]);
+expect([3, 2, 1]).toEqual([...obj]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/new-object.js

@@ -4,8 +4,8 @@ function getArray() {
   return Array;
 }
 
-assert.deepEqual([1, 2, 3], new Array(...[1, 2, 3]));
+expect([1, 2, 3]).toEqual(new Array(...[1, 2, 3]));
 
 // Ensure the expression of the function being initialized is not copied.
-assert.deepEqual([1, 2, 3], new (getArray())(...[1, 2, 3]));
-assert.equal(callCount, 1);
+expect([1, 2, 3]).toEqual(new (getArray())(...[1, 2, 3]));
+expect(callCount).toBe(1);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/preserve-context.js

@@ -8,7 +8,7 @@ var MATH = {
   }
 };
 
-assert.equal(MATH.sum(1, ...[2, 3]), 6);
+expect(MATH.sum(1, ...[2, 3])).toBe(6);
 
 // Ensure that the below does not expand to this:
 //
@@ -28,8 +28,8 @@ var obj = {
 };
 
 obj.getSelf().doCall(...[]);
-assert.deepEqual(ops, ['getSelf', 'doCall', obj]);
+expect(ops).toEqual(['getSelf', 'doCall', obj]);
 
 ops = [];
 obj['getSelf']().doCall(...[]);
-assert.deepEqual(ops, ['getSelf', 'doCall', obj]);
+expect(ops).toEqual(['getSelf', 'doCall', obj]);

packages/babel-preset-es2015/test/fixtures/esnext/es6-spread/simple-function-call.js

@@ -3,4 +3,4 @@ function sum(...numbers) {
 }
 
 var numbers = [1, 2, 3];
-assert.equal(sum(...numbers), 6);
+expect(sum(...numbers)).toBe(6);

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/multi-line.js

@@ -1,4 +1,4 @@
 var s = `a
     b
     c`;
-assert.equal(s, 'a\n    b\n    c');
+expect(s).toBe('a\n    b\n    c');

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/nested-interpolation.js

@@ -1,4 +1 @@
-assert.strictEqual(
-  `a${1}b${`${1+1}c`}3`,
-  'a1b2c3'
-);
+expect(`a${1}b${`${1+1}c`}3`).toBe('a1b2c3');

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/no-interpolation.js

@@ -1,2 +1,2 @@
 var s = `str`;
-assert.equal(s, 'str');
+expect(s).toBe('str');

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/raw-tagged-template-expression.js

@@ -1,6 +1,6 @@
 function r(strings) {
-  assert.equal(strings.raw[0], '\\n');
+  expect(strings.raw[0]).toBe('\\n');
   return strings.raw.join('');
 }
 
-assert.equal(r `\n`, '\\n');
+expect(r `\n`).toBe('\\n');

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/simple-interpolation.js

@@ -1,2 +1,2 @@
 var s = `1 + 1 = ${1 + 1}`;
-assert.equal(s, '1 + 1 = 2');
+expect(s).toBe('1 + 1 = 2');

packages/babel-preset-es2015/test/fixtures/esnext/es6-templates/tagged-template-expression.js

@@ -1,26 +1,26 @@
 function tag(strings) {
   var values = [].slice.call(arguments, 1);
-  assert.equal(strings[0], 'a');
-  assert.equal(strings[1], 'b');
-  assert.equal(values[0], 42);
+  expect(strings[0]).toBe('a');
+  expect(strings[1]).toBe('b');
+  expect(values[0]).toBe(42);
   return 'whatever';
 }
-assert.equal(tag `a${ 42 }b`, 'whatever');
+expect(tag `a${ 42 }b`).toBe('whatever');
 
 function tagInterpolateFirst(strings) {
   var values = [].slice.call(arguments, 1);
-  assert.equal(strings[0], '');
-  assert.equal(strings[1], 'b');
-  assert.equal(values[0], 42);
+  expect(strings[0]).toBe('');
+  expect(strings[1]).toBe('b');
+  expect(values[0]).toBe(42);
   return 'whatever';
 }
-assert.equal(tagInterpolateFirst `${ 42 }b`, 'whatever');
+expect(tagInterpolateFirst `${ 42 }b`).toBe('whatever');
 
 function tagInterpolateLast(strings) {
   var values = [].slice.call(arguments, 1);
-  assert.equal(strings[0], 'a');
-  assert.equal(strings[1], '');
-  assert.equal(values[0], 42);
+  expect(strings[0]).toBe('a');
+  expect(strings[1]).toBe('');
+  expect(values[0]).toBe(42);
   return 'whatever';
 }
-assert.equal(tagInterpolateLast `a${ 42 }`, 'whatever');
+expect(tagInterpolateLast `a${ 42 }`).toBe('whatever');

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

@@ -1,47 +1,47 @@
 // should have a length of 1
-assert.equal(Array.prototype.fill.length, 1);
+expect(Array.prototype.fill).toHaveLength(1);
 
 // should fill from basic case
-assert.deepEqual([1, 2, 3].fill(5), [5, 5, 5]);
+expect([1, 2, 3].fill(5)).toEqual([5, 5, 5]);
 
 // should fill from start
-assert.deepEqual([1, 2, 3].fill(5, 1), [1, 5, 5]);
+expect([1, 2, 3].fill(5, 1)).toEqual([1, 5, 5]);
 
 // should fill from start to end
-assert.deepEqual([1, 2, 3].fill(5, 1, 2), [1, 5, 3]);
+expect([1, 2, 3].fill(5, 1, 2)).toEqual([1, 5, 3]);
 
 // should fill from negative start
-assert.deepEqual([1, 2, 3].fill(5, -1), [1, 2, 5]);
+expect([1, 2, 3].fill(5, -1)).toEqual([1, 2, 5]);
 
 // should fill from negative start to positive end
-assert.deepEqual([1, 2, 3].fill(5, -2, 3), [1, 5, 5]);
+expect([1, 2, 3].fill(5, -2, 3)).toEqual([1, 5, 5]);
 
 // should fill from negative start to negative end
-assert.deepEqual([1, 2, 3].fill(5, -3, -1), [5, 5, 3]);
+expect([1, 2, 3].fill(5, -3, -1)).toEqual([5, 5, 3]);
 
 // should fill from positive start to negative end
-assert.deepEqual([1, 2, 3].fill(5, 1, -1), [1, 5, 3]);
+expect([1, 2, 3].fill(5, 1, -1)).toEqual([1, 5, 3]);
 
 // should fill custom object
-assert.deepEqual(Array.prototype.fill.call({'0': 1, 'length': 3}, 5), {'0': 5, '1': 5, '2': 5, 'length': 3});
+expect(Array.prototype.fill.call({'0': 1, 'length': 3}, 5)).toEqual({'0': 5, '1': 5, '2': 5, 'length': 3});
 
 // should handle custom object with negative length
 //assert.deepEqual(Array.prototype.fill.call({'0': 2, 'length': -1}, 5), {'0': 2, 'length': -1});
 
 // should handle no elements
-assert.deepEqual([].fill(5), []);
+expect([].fill(5)).toEqual([]);
 
 // should handle bad start
-assert.deepEqual([1, 2, 3].fill(5, 'hello'), [5, 5, 5]);
+expect([1, 2, 3].fill(5, 'hello')).toEqual([5, 5, 5]);
 
 // should handle bad end
-assert.deepEqual([1, 2, 3].fill(5, 1, {}), [1, 2, 3]);
+expect([1, 2, 3].fill(5, 1, {})).toEqual([1, 2, 3]);
 
 // should handle bad start and end
-assert.deepEqual([1, 2, 3].fill(5, 'hello', {}), [1, 2, 3]);
+expect([1, 2, 3].fill(5, 'hello', {})).toEqual([1, 2, 3]);
 
 
 // should handle bad this
-assert.throws(function() {
+expect(function() {
   Array.prototype.fill.call(null, 5)
-}, TypeError);
+}).toThrow(TypeError);

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

@@ -1,36 +1,36 @@
 // should have a length of 1
-assert.equal(Array.prototype.find.length, 1);
+expect(Array.prototype.find.length).toBe(1);
 
 // should handle basic case
-assert.equal([1, 2, 3].find(function(v) {
+expect([1, 2, 3].find(function(v) {
   return v * v === 4;
-}), 2);
+})).toBe(2);
 
 // should handle arrow functions
-assert.equal([1, 2, 3].find(v => v * v === 4), 2);
+expect([1, 2, 3].find(v => v * v === 4)).toBe(2);
 
 // should return undefined when not found
-assert.equal([1, 2, 3].find(v => v > 10), undefined);
+expect([1, 2, 3].find(v => v > 10)).toBeUndefined();
 
 // should return first match
-assert.equal([2, 2, 3].find(v => v * v === 4), 2);
+expect([2, 2, 3].find(v => v * v === 4)).toBe(2);
 
 // should handle custom objects
-assert.equal(Array.prototype.find.call({
+expect(Array.prototype.find.call({
   'length': 2,
   '0': false,
   '1': true
-}, v => v), true);
+}, v => v)).toBe(true);
 
 // should handle bad predicate
-assert.throws(function() {
+expect(function() {
   [1, 2, 3].find(1)
-}, TypeError);
+}).toThrow('TypeError');
 
 // should handle bad this
-assert.throws(function() {
+expect(function() {
   Array.prototype.find.call(null, function() {})
-}, TypeError);
+}).toThrow('TypeError');
 
 // should correctly handle this
 var global = this;
@@ -40,25 +40,25 @@ var global = this;
 
     // should be global this
     [1, 2, 3].find(function() {
-      assert.notEqual(this, self);
-      assert.equal(this, global);
+      expect(this).not.toBe(self);
+      expect(this).toBe(global);
     });
 
     // should be the same this
     [1, 2, 3].find(function() {
-      assert.equal(this, self);
+      expect(this).toBe(self);
     }, self);
 
     // should not have an effect on arrow functions
-    [1, 2, 3].find(() => assert.equal(this, self));
-    [1, 2, 3].find(() => assert.equal(this, self), self);
+    [1, 2, 3].find(() => expect(this).toBe(self));
+    [1, 2, 3].find(() => expect(this).toBe(self), self);
 
     // should call with correct args
     var arr = [5];
     arr.find(function(value, i, object) {
-      assert.equal(value, 5);
-      assert.equal(i, 0);
-      assert.equal(arr, object);
+      expect(value).toBe(5);
+      expect(i).toBe(0);
+      expect(arr).toBe(object);
     });
   }
 }).assert();
@@ -79,10 +79,10 @@ var object = {
   }
 };
 
-assert.equal(Array.prototype.find.call(object, (v) => {
+expect(Array.prototype.find.call(object, (v) => {
   callbackCalls++;
   return v === 'a';
-}), 'a');
-assert.equal(lengthCalls, 1);
-assert.equal(itemCalls, 1);
-assert.equal(callbackCalls, 3);
+})).toBe('a');
+expect(lengthCalls).toBe(1);
+expect(itemCalls).toBe(1);
+expect(callbackCalls).toBe(3);

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

@@ -1,26 +1,26 @@
 // should have a length of 1
-assert.equal(Array.prototype.findIndex.length, 1);
+expect(Array.prototype.findIndex.length).toBe(1);
 
 // should handle basic case
-assert.equal([1, 2, 3].findIndex(function(v) {
+expect([1, 2, 3].findIndex(function(v) {
   return v * v === 4;
-}), 1);
+})).toBe(1);
 
 // should handle arrow functions
-assert.equal([1, 2, 3].findIndex(v => v * v === 4), 1);
+expect([1, 2, 3].findIndex(v => v * v === 4)).toBe(1);
 
 // should return -1 when not found
-assert.equal([1, 2, 3].findIndex(v => v > 10), -1);
+expect([1, 2, 3].findIndex(v => v > 10)).toBe(-1);
 
 // should return first match
-assert.equal([2, 2, 3].findIndex(v => v * v === 4), 0);
+expect([2, 2, 3].findIndex(v => v * v === 4)).toBe(0);
 
 // should handle custom objects
-assert.equal(Array.prototype.findIndex.call({
+expect(Array.prototype.findIndex.call({
   'length': 2,
   '0': false,
   '1': true
-}, v => v), 1);
+}, v => v)).toBe(1);
 
 var lengthCalls = 0;
 var itemCalls = 0;
@@ -38,10 +38,10 @@ var object = {
   }
 };
 
-assert.equal(Array.prototype.findIndex.call(object, (v) => {
+expect(Array.prototype.findIndex.call(object, (v) => {
   callbackCalls++;
   return v === 'a';
-}), 2);
-assert.equal(lengthCalls, 1);
-assert.equal(itemCalls, 1);
-assert.equal(callbackCalls, 3);
+})).toBe(2);
+expect(lengthCalls).toBe(1);
+expect(itemCalls).toBe(1);
+expect(callbackCalls).toBe(3);

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

@@ -1,5 +1,5 @@
 // should have a length of 1
-assert.equal(Array.from.length, 1);
+expect(Array.from.length).toBe(1);
 var arr;
 var obj;
 
@@ -9,24 +9,24 @@ function arrayFromArgs() {
 }
 arr = arrayFromArgs('a', 1);
 
-assert.equal(arr.length, 2);
-assert.deepEqual(arr, ['a', 1]);
-assert.isTrue(Array.isArray(arr));
+expect(arr.length).toBe(2);
+expect(arr).toEqual(['a', 1]);
+expect(Array.isArray(arr)).toBe(true);
 
 // should handle undefined values
 var arrayLike = {0: 'a', 2: 'c', length: 3};
 arr = Array.from(arrayLike);
 
-assert.equal(arr.length, 3);
-assert.deepEqual(arr, ['a', undefined, 'c']);
-assert.isTrue(Array.isArray(arr));
+expect(arr.length).toBe(3);
+expect(arr).toEqual(['a', undefined, 'c']);
+expect(Array.isArray(arr)).toBe(true);
 
 // should use a mapFn
 arr = Array.from([{'a': 1}, {'a': 2}], function(item, i) {
   return item.a + i;
 });
 
-assert.deepEqual(arr, [1, 3]);
+expect(arr).toEqual([1, 3]);
 
 // should set this in mapFn
 var thisObj = {a: 10};
@@ -34,19 +34,19 @@ arr = Array.from([{'a': 1}, {'a': 2}], function(item, i) {
   return this.a + item.a + i;
 }, thisObj);
 
-assert.deepEqual(arr, [11, 13]);
+expect(arr).toEqual([11, 13]);
 
 // should map on array-like object
 arr = Array.from({0: {'a': 5}, length: 1}, function(item, i) {
   return item.a + i;
 });
 
-assert.deepEqual(arr, [5]);
+expect(arr).toEqual([5]);
 
 // should throw on bad map fn
-assert.throws(function() {
+expect(function() {
   Array.from([], null)
-}, TypeError);
+}).toThrow();
 
 // should make from an array-like object
 var arrayLikeObj = function(len) {
@@ -55,8 +55,8 @@ var arrayLikeObj = function(len) {
 arrayLikeObj.from = Array.from;
 obj = arrayLikeObj.from(['a', 'b', 'c']);
 
-assert.equal(obj.length, 3);
-assert.deepEqual(obj, {0: 'a', 1: 'b', 2: 'c', length: 3});
+expect(obj).toHaveLength(3);
+expect(obj).toEqual({0: 'a', 1: 'b', 2: 'c', length: 3});
 
 // should make from a non-array iterable
 var calledIterator = 0;
@@ -77,11 +77,11 @@ it[1] = 'b';
 it[2] = 'c';
 obj = Array.from(it);
 
-assert.equal(obj.length, 3);
-assert.equal(obj[0], 'a');
-assert.equal(obj[1], 'b');
-assert.equal(obj[2], 'c');
-assert.equal(calledIterator, 3);
+expect(obj).toHaveLength(3);
+expect(obj[0]).toBe('a');
+expect(obj[1]).toBe('b');
+expect(obj[2]).toBe('c');
+expect(calledIterator).toBe(3);
 
 // should make from a sub-classed array
 var length = 0;
@@ -93,7 +93,7 @@ class MyArray extends Array {
   constructor(v) {
     super();
     constructorCounter++;
-    assert.isUndefined(v);
+    expect(v).toBeUndefined();
   }
 
   set length(v) {
@@ -109,15 +109,15 @@ class MyArray extends Array {
 
 var ma = MyArray.from(['a', 'b']);
 assert.instanceOf(ma, MyArray);
-assert.equal(constructorCounter, 1);
-assert.equal(lengthSetCounter, 1);
-assert.equal(lengthGetCounter, 0);
-assert.isTrue(ma.hasOwnProperty('0'));
-assert.isTrue(ma.hasOwnProperty('1'));
-assert.isFalse(ma.hasOwnProperty('length'));
-assert.equal(ma[0], 'a');
-assert.equal(ma[1], 'b');
-assert.equal(ma.length, 2);
+expect(constructorCounter).toBe(1);
+expect(lengthSetCounter).toBe(1);
+expect(lengthGetCounter).toBe(0);
+expect(ma).toContain('0');
+expect(ma).toContain('1');
+expect(ma).not.toContain('length');
+expect(ma[0]).toBe('a');
+expect(ma[1]).toBe('b');
+expect(ma).toHaveLength(2);
 
 // should make from a sub-classed array without iterable
 length = 0;
@@ -129,7 +129,7 @@ class MyArray2 extends MyArray {
   constructor(v) {
     super();
     constructorCounter++;
-    assert.equal(v, 2);
+    expect(v).toBe(2);
   }
 };
 MyArray2.prototype[Symbol.iterator] = undefined;
@@ -147,12 +147,12 @@ ma3[0] = 'a';
 ma3[1] = 'b';
 ma = MyArray2.from(ma3);
 assert.instanceOf(ma, MyArray2);
-assert.equal(constructorCounter, 2);
-assert.equal(lengthSetCounter, 1);
-assert.equal(lengthGetCounter, 0);
-assert.isTrue(ma.hasOwnProperty('0'));
-assert.isTrue(ma.hasOwnProperty('1'));
-assert.isFalse(ma.hasOwnProperty('length'));
-assert.equal(ma[0], 'a');
-assert.equal(ma[1], 'b');
-assert.equal(ma.length, 2);
+expect(constructorCounter).toBe(2);
+expect(lengthSetCounter).toBe(1);
+expect(lengthGetCounter).toBe(0);
+expect(ma).toContain('0');
+expect(ma).toContain('1');
+expect(ma).not.toContain('length');
+expect(ma[0]).toBe('a');
+expect(ma[1]).toBe('b');
+expect(ma).toHaveLength(2);

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

@@ -1,25 +1,25 @@
 var arr;
 
 // should have a length of 0
-assert.equal(Array.of.length, 0);
+expect(Array.of.length).toBe(0);
 
 //should return an array from arguments
 arr = Array.of(1, 'a', 3);
-assert.deepEqual(arr, [1, 'a', 3]);
+expect(arr).toEqual([1, 'a', 3]);
 //assert.isTrue(arr instanceof Array);
 
 //should work with no arguments
 arr = Array.of();
-assert.deepEqual(arr, []);
+expect(arr).toEqual([]);
 //assert.isTrue(arr instanceof Array);
 
 //should work with sub-classed array
 class MyArray extends Array {}
 
 arr = MyArray.of(4, 'b');
-assert.equal(arr[0], 4);
-assert.equal(arr[1], 'b');
-assert.equal(arr.length, 2);
+expect(arr[0]).toBe(4);
+expect(arr[1]).toBe('b');
+expect(arr).toHaveLength(2);
 //assert.isTrue(arr instanceof MyArray);
 
 //should call with exotic array
@@ -29,9 +29,9 @@ class ExoticArray {
   }
 }
 arr = Array.of.call(ExoticArray, 5, 'c', 6, 'd');
-assert.equal(arr[0], 5);
-assert.equal(arr[1], 'c');
-assert.equal(arr[2], 6);
-assert.equal(arr[3], 'd');
-assert.equal(arr.length, 4);
+expect(arr[0]).toBe(5);
+expect(arr[1]).toBe('c');
+expect(arr[2]).toBe(6);
+expect(arr[3]).toBe('d');
+expect(arr).toHaveLength(4);
 //assert.isTrue(arr instanceof ExoticArray);

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/AlphaRename.js

@@ -3,15 +3,15 @@ var self = {};
 
 function outer() {
   var f = () => {
-    assert.equal(this, self);
+    expect(this).toBe(self);
 
     var g = () => {
-      assert.equal(this, self);
+      expect(this).toBe(self);
     };
     g();
 
     var h = function() {
-      assert.equal(this, global);
+      expect(this).toBe(global);
     };
     h();
   };

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/AlphaRenameThisArguments.js

@@ -3,9 +3,9 @@ var self = {};
 
 function f() {
   (() => {
-    assert.equal(self, this);
-    assert.equal(1, arguments.length);
-    assert.equal(42, arguments[0]);
+    expect(self).toBe(this);
+    expect(1).toBe(arguments.length);
+    expect(42).toBe(arguments[0]);
 
     var THIS = 0;
     var ARGUMENTS = 1;
@@ -22,20 +22,20 @@ function f() {
       }
     };
 
-    assert.equal(object, object.function()[THIS]);
-    assert.equal(2, object.function('a', 'b')[ARGUMENTS].length);
-    assert.equal('a', object.function('a', 'b')[ARGUMENTS][0]);
-    assert.equal('b', object.function('a', 'b')[ARGUMENTS][1]);
+    expect(object.function()[THIS]).toBe(object);
+    expect(object.function('a', 'b')[ARGUMENTS]).toHaveLength(2);
+    expect(object.function('a', 'b')[ARGUMENTS][0]).toBe('a');
+    expect(object.function('a', 'b')[ARGUMENTS][1]).toBe('b');
 
-    assert.equal(object, object.method()[THIS]);
-    assert.equal(3, object.method('c', 'd', 'e')[ARGUMENTS].length);
-    assert.equal('c', object.method('c', 'd', 'e')[ARGUMENTS][0]);
-    assert.equal('d', object.method('c', 'd', 'e')[ARGUMENTS][1]);
-    assert.equal('e', object.method('c', 'd', 'e')[ARGUMENTS][2]);
+    expect(object.function()[THIS]).toBe(object);
+    expect(object.method('c', 'd', 'e')[ARGUMENTS]).toHaveLength(3);
+    expect(object.method('c', 'd', 'e')[ARGUMENTS][0]).toBe('c');
+    expect(object.method('c', 'd', 'e')[ARGUMENTS][1]).toBe('d');
+    expect(object.method('c', 'd', 'e')[ARGUMENTS][2]).toBe('e');
 
-    assert.equal(self, object.arrow()[THIS]);
-    assert.equal(1, object.arrow('f', 'g')[ARGUMENTS].length);
-    assert.equal(42, object.arrow('f', 'g')[ARGUMENTS][0]);
+    expect(object.arrow()[THIS]).toBe(self);
+    expect(object.arrow('f', 'g')[ARGUMENTS]).toHaveLength(1);
+    expect(object.arrow('f', 'g')[ARGUMENTS][0]).toBe(42);
   })();
 }
 

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/Arguments.js

@@ -1,6 +1,6 @@
 function f() {
   var args = (() => arguments)();
-  assert.equal(args, arguments);
+  expect(args).toBe(arguments);
 }
 
 f();

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

@@ -4,49 +4,49 @@
 // http://wiki.ecmascript.org/doku.php?id=strawman:arrow_function_syntax
 
 let empty = () => undefined;
-assert.equal(empty(), undefined);
+expect(empty()).toBe(undefined);
 
 // Expression bodies needs no parentheses or braces
 let identity = (x) => x;
-assert.equal(identity(empty), empty);
+expect(identity(empty)).toBe(empty);
 
 // Object literals needs to be wrapped in parens.
 let keyMaker = (val) => ({key: val});
-assert.equal(keyMaker(empty).key, empty);
+expect(keyMaker(empty).key).toBe(empty);
 
 // => { starts a block.
 let emptyBlock = () => {a: 42};
-assert.equal(emptyBlock(), undefined);
+expect(emptyBlock()).toBe(undefined);
 
 // Nullary arrow function starts with arrow (cannot begin statement)
 const preamble = 'hello';
 const body = 'world';
 let nullary = () => preamble + ': ' + body;
-assert.equal('hello: world', nullary());
+expect('hello: world').toBe(nullary());
 
 // No need for parens even for lower-precedence expression body
 let square = x => x * x;
-assert.equal(81, square(9));
+expect(81).toBe(square(9));
 
 let oddArray = [];
 let array = [2, 3, 4, 5, 6, 7];
 array.forEach((v, i) => { if (i & 1) oddArray[i >>> 1] = v; });
-assert.equal('3,5,7', oddArray.toString());
+expect('3,5,7').toBe(oddArray.toString());
 
 var f = (x = 42) => x;
-assert.equal(42, f());
+expect(42).toBe(f());
 
 {
   let g = (...xs) => xs;
-  assertArrayEquals([0, 1, true], g(0, 1, true));
+  expect(g(0, 1, true)).toEqual([0, 1, true]);;
 }
 
 var h = (x, ...xs) => xs;
-assertArrayEquals([0, 1, true], h(-1, 0, 1, true));
+expect(h(-1, 0, 1, true)).toEqual([0, 1, true]);;
 
-assert.equal(typeof (() => {}), 'function');
-assert.equal(Object.getPrototypeOf(() => {}), Function.prototype);
+expect(typeof (() => {})).toBe('function');
+expect(Object.getPrototypeOf(() => {})).toBe(Function.prototype);
 
 var i = ({a = 1}) => a;
-assert.equal(i({}), 1);
-assert.equal(i({a: 2}), 2);
+expect(i({})).toBe(1);
+expect(i({a: 2})).toBe(2);

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/FreeVariableChecker.js

@@ -1,2 +1,2 @@
 var identity = (identityParam) => identityParam;
-assert.equal(1234, identity(1234));
+expect(1234).toBe(identity(1234));

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/Parens.js

@@ -15,5 +15,5 @@ class D extends C {
 }
 
 var o = new D();
-assert.equal(typeof o.x.y, 'function');
-assert.equal(o.x.y(), o);
+expect(typeof o.x.y).toBe('function');
+expect(o.x.y()).toBe(o);

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/SloppyArguments.js

@@ -2,14 +2,14 @@
 var f1 = implements => implements;
 var f2 = implements => { return implements; };
 var f3 = (implements) => { return implements; };
-assert.equal(1, f1(1));
-assert.equal(2, f2(2));
-assert.equal(3, f1(3));
+expect(1).toBe(f1(1));
+expect(2).toBe(f2(2));
+expect(3).toBe(f1(3));
 
 var g = ({static}) => static;
-assert.equal(4, g({static: 4}));
+expect(4).toBe(g({static: 4}));
 
 var h1 = ([protected]) => protected;
 var h2 = ([...protected]) => protected[0];
-assert.equal(5, h1([5]));
-assert.equal(6, h2([6]));
+expect(5).toBe(h1([5]));
+expect(6).toBe(h2([6]));

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/ThisBindingInPropertyName.js

@@ -4,11 +4,11 @@ var obj = {
     var f = (x) => ({[this.name]: x});
 
     var o = f(1);
-    assert.equal(1, o.x);
+    expect(1).toBe(o.x);
 
     this.name = 2;
     o = f(3);
-    assert.equal(3, o[2]);
+    expect(3).toBe(o[2]);
   }
 };
 

packages/babel-preset-es2015/test/fixtures/traceur/ArrowFunctions/ThisBindings.js

@@ -8,11 +8,11 @@ const obj = {
     return () => this;
   }
 };
-assert.equal(obj.method()(), obj);
+expect(obj.method()()).toBe(obj);
 
 let fake = {steal: obj.method()};
-assert.equal(fake.steal(), obj);
+expect(fake.steal()).toBe(obj);
 
 let real = {borrow: obj.method};
-assert.equal(real.borrow()(), real);
+expect(real.borrow()()).toBe(real);
 

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

@@ -12,9 +12,9 @@ var obj = {};
 var value;
 
 async function A() {
-  assert.equal(this, self);
+  expect(this).toBe(self);
   var value = await asyncComplete(this, arguments[0]);
-  assert.deepEqual([self, obj], value);
+  expect([self, obj]).toEqual(value);
   done();
 }
 

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

@@ -4,6 +4,6 @@
 var f = async () => 1;
 
 f().then((result) => {
-  assert.equal(result, 1);
+  expect(result).toBe(1);
   done();
 }).catch(done);

packages/babel-preset-es2015/test/fixtures/traceur/AsyncFunctions/AsyncArrow2.js

@@ -4,6 +4,6 @@
 var f = async x => x;
 
 f(1).then((result) => {
-  assert.equal(result, 1);
+  expect(result).toBe(1);
   done();
 }).catch(done);

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

@@ -5,10 +5,10 @@ function g() {
   var f = async (x = arguments) => [x, arguments];
 
   f().then((result) => {
-    assert.equal(result[0][0], 1);
-    assert.equal(result[1][0], 1);
-    assert.equal(result[0][1], 2);
-    assert.equal(result[1][1], 2);
+    expect(result[0][0]).toBe(1);
+    expect(result[1][0]).toBe(1);
+    expect(result[0][1]).toBe(2);
+    expect(result[1][1]).toBe(2);
     done();
   }).catch(done);
 }

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

@@ -5,8 +5,8 @@ function g() {
   var f = async (x = this) => [x, this];
   var p = {};
   f.call(p).then((result) => {
-    assert.equal(result[0], o);
-    assert.equal(result[1], o);
+    expect(result[0]).toBe(o);
+    expect(result[1]).toBe(o);
     done();
   }).catch(done);
 }

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

@@ -11,18 +11,18 @@ class C {
   async test() {
     var x = 0;
     await asyncTimeout(1);
-    assert.equal(1, ++x);
+    expect(1).toBe(++x);
     await asyncTimeout(1);
-    assert.equal(2, ++x);
+    expect(2).toBe(++x);
     C.test();
   }
 
   static async test() {
     var x = 0;
     await asyncTimeout(1);
-    assert.equal(1, ++x);
+    expect(1).toBe(++x);
     await asyncTimeout(1);
-    assert.equal(2, ++x);
+    expect(2).toBe(++x);
 
     done();
   }

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

@@ -11,9 +11,9 @@ var object = {
   async test() {
     var x = 0;
     await asyncTimeout(1);
-    assert.equal(1, ++x);
+    expect(1).toBe(++x);
     await asyncTimeout(1);
-    assert.equal(2, ++x);
+    expect(2).toBe(++x);
     done();
   }
 }

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

@@ -7,12 +7,12 @@ function f() {
 }
 
 async = 1;
-assert.equal(async, 1);
-assert.equal(f(), 2);
+expect(async).toBe(1);
+expect(f()).toBe(2);
 
 async = async
 function g() {
 
 }
 
-assert.equal(async, 1);
+expect(async).toBe(1);

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

@@ -7,40 +7,40 @@ var f = (x, y) => ({x, y});
 
 (async function() {
   var x = await 1;
-  assert.equal(1, x);
+  expect(1).toBe(x);
   x = await (await 2);
-  assert.equal(2, x);
+  expect(2).toBe(x);
   x = (await 3, await 4);
-  assert.equal(4, x);
+  expect(4).toBe(x);
 
   x = f(await 5, await 6);
-  assert.deepEqual({x: 5, y: 6}, x);
+  expect({x: 5, y: 6}).toEqual(x);
   x = await f(await 7, await 8);
-  assert.deepEqual({x: 7, y: 8}, x);
+  expect({x: 7, y: 8}).toEqual(x);
 
   if (await true) {
     x = 9;
   } else {
     x = 10;
   }
-  assert.equal(9, x);
+  expect(9).toBe(x);
   if (await false) {
     x = 11;
   } else {
     x = 12;
   }
-  assert.equal(12, x);
+  expect(12).toBe(x);
 
   var j = 0;
   for (var i = await 0; (await i) < (await 3); await i++) {
-    assert.equal(i, j++);
+    expect(i).toBe(j++);
   }
-  assert.equal(3, j);
+  expect(3).toBe(j);
 
   var g = (x) => x;
   var h = () => 13;
   x = await g({z: await h()});
-  assert.deepEqual({z: 13}, x);
+  expect({z: 13}).toEqual(x);
 
   done();
 })();

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

@@ -11,6 +11,6 @@ function asyncComplete() {
 
 (async function() {
   var value = await asyncComplete();
-  assert.equal('complete', value);
+  expect('complete').toBe(value);
   done();
 })();

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

@@ -5,6 +5,6 @@ async function empty() {
 }
 
 empty().then((v) => {
-  assert.isUndefined(v);
+  expect(v).toBeUndefined();
   done();
-});
+});

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

@@ -9,10 +9,10 @@ assert.instanceOf(asyncFunctionDefault(), Promise);
 
 (async function() {
   var x = await asyncFunction();
-  assert.equal(x, 1);
+  expect(x).toBe(1);
 
   var y = await asyncFunctionDefault();
-  assert.equal(y, 2);
+  expect(y).toBe(2);
 
   done();
 })();

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

@@ -15,11 +15,11 @@ async function test() {
   } finally {
     finallyVisited = true;
   }
-  assert.equal(42, v);
-  assert.isTrue(finallyVisited);
+  expect(42).toBe(v);
+  expect(finallyVisited).toBe(true);
   done();
 }
 
 test();
-assert.isFalse(finallyVisited);
+expect(finallyVisited).toBe(false);
 resolve(42);

packages/babel-preset-es2015/test/fixtures/traceur/AsyncFunctions/Finally2.js

@@ -12,10 +12,10 @@ async function test() {
   } finally {
     finallyVisited = true;
   }
-  assert.isTrue(finallyVisited);
+  expect(finallyVisited).toBe(true);
   done();
 }
 
 test();
-assert.isFalse(finallyVisited);
+expect(finallyVisited).toBe(false);
 resolve();

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

@@ -3,9 +3,9 @@
 
 async function f() {
   var x = await 1;
-  assert.equal(x, 1);
+  expect(x).toBe(1);
   x = await undefined;
-  assert.equal(x, undefined);
+  expect(x).toBeUndefined();
   done();
 }
 

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

@@ -3,5 +3,5 @@
 async function f() {
 }
 
-assert.equal(Object.getPrototypeOf(f), Function.prototype);
-assert.instanceOf(f(), Promise);
+expect(Object.getPrototypeOf(f)).toBe(Function.prototype);
+expect(f() instanceof Promise).toBe(true);

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

@@ -8,6 +8,6 @@ async function rethrow(x) {
 }
 
 rethrow(2).catch((err) => {
-  assert.equal(err, 2)
+  expect(err).toBe(2);
   done();
 });

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

@@ -9,8 +9,8 @@ async function ret(x) {
 
 (async function() {
   var v = await ret(4);
-  assert.equal(v, 2);
+  expect(v).toBe(2);
   v = await ret(0);
-  assert.equal(v, 3);
+  expect(v).toBe(3);
   done();
 })();

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

@@ -23,7 +23,7 @@ function asyncTimeout(ms) {
     value = await asyncThrow(1);
     fail("shouldn't get here");
   } catch (e) {
-    assert.equal(1, e);
+    expect(1).toBe(e);
   }
 
   done();

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

@@ -10,12 +10,12 @@ function asyncTimeout(ms) {
 (async function() {
   var x = 0;
   await asyncTimeout(1);
-  assert.equal(1, ++x);
+  expect(1).toBe(++x);
   await asyncTimeout(1);
-  assert.equal(2, ++x);
+  expect(2).toBe(++x);
   await asyncTimeout(1);
-  assert.equal(3, ++x);
+  expect(3).toBe(++x);
   await asyncTimeout(1);
-  assert.equal(4, ++x);
+  expect(4).toBe(++x);
   done();
 })();