v8/test/mjsunit/es6/promises.js

// Copyright 2013 the V8 project authors. All rights reserved.
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
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//       copyright notice, this list of conditions and the following
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//       with the distribution.
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//       contributors may be used to endorse or promote products derived
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//
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// Flags: --harmony-promises --allow-natives-syntax

var asyncAssertsExpected = 0;

function assertAsyncRan() { ++asyncAssertsExpected }

function assertAsync(b, s) {
  if (b) {
    print(s, "succeeded")
  } else {
    %AbortJS(s + " FAILED!")  // Simply throwing here will have no effect.
  }
  --asyncAssertsExpected
}

function assertAsyncDone(iteration) {
  var iteration = iteration || 0
  var dummy = {}
  Object.observe(dummy,
    function() {
      if (asyncAssertsExpected === 0)
        assertAsync(true, "all")
      else if (iteration > 10)  // Shouldn't take more.
        assertAsync(false, "all")
      else
        assertAsyncDone(iteration + 1)
    }
  )
  dummy.dummy = dummy
}


(function() {
  assertThrows(function() { Promise(function() {}) }, TypeError)
})();

(function() {
  assertTrue(new Promise(function() {}) instanceof Promise)
})();

(function() {
  assertThrows(function() { new Promise(5) }, TypeError)
})();

(function() {
  assertDoesNotThrow(function() { new Promise(function() { throw 5 }) })
})();

(function() {
  (new Promise(function() { throw 5 })).chain(
    assertUnreachable,
    function(r) { assertAsync(r === 5, "new-throw") }
  )
  assertAsyncRan()
})();

(function() {
  Promise.accept(5);
  Promise.accept(5).chain(undefined, assertUnreachable).chain(
    function(x) { assertAsync(x === 5, "resolved/chain-nohandler") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  Promise.reject(5).chain(assertUnreachable, undefined).chain(
    assertUnreachable,
    function(r) { assertAsync(r === 5, "rejected/chain-nohandler") }
  )
  assertAsyncRan()
})();

(function() {
  Promise.accept(5).then(undefined, assertUnreachable).chain(
    function(x) { assertAsync(x === 5, "resolved/then-nohandler-undefined") },
    assertUnreachable
  )
  assertAsyncRan()
  Promise.accept(6).then(null, assertUnreachable).chain(
    function(x) { assertAsync(x === 6, "resolved/then-nohandler-null") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  Promise.reject(5).then(assertUnreachable, undefined).chain(
    assertUnreachable,
    function(r) { assertAsync(r === 5, "rejected/then-nohandler-undefined") }
  )
  assertAsyncRan()
  Promise.reject(6).then(assertUnreachable, null).chain(
    assertUnreachable,
    function(r) { assertAsync(r === 6, "rejected/then-nohandler-null") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "resolved/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(
    function(x) { assertAsync(x === 5, "resolved/then") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.reject(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "rejected/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.reject(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "rejected/then") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { return x }, assertUnreachable).chain(
    function(x) { assertAsync(x === p1, "resolved/chain/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { return x }, assertUnreachable).then(
    function(x) { assertAsync(x === 5, "resolved/chain/then") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { return 6 }, assertUnreachable).chain(
    function(x) { assertAsync(x === 6, "resolved/chain/chain2") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { return 6 }, assertUnreachable).then(
    function(x) { assertAsync(x === 6, "resolved/chain/then2") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x) { return x + 1 }, assertUnreachable).chain(
    function(x) { assertAsync(x === 6, "resolved/then/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x) { return x + 1 }, assertUnreachable).then(
    function(x) { assertAsync(x === 6, "resolved/then/then") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x){ return Promise.accept(x+1) }, assertUnreachable).chain(
    function(x) { assertAsync(x === 6, "resolved/then/chain2") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x) { return Promise.accept(x+1) }, assertUnreachable).then(
    function(x) { assertAsync(x === 6, "resolved/then/then2") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { throw 6 }, assertUnreachable).chain(
    assertUnreachable,
    function(x) { assertAsync(x === 6, "resolved/chain-throw/chain") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(function(x) { throw 6 }, assertUnreachable).then(
    assertUnreachable,
    function(x) { assertAsync(x === 6, "resolved/chain-throw/then") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x) { throw 6 }, assertUnreachable).chain(
    assertUnreachable,
    function(x) { assertAsync(x === 6, "resolved/then-throw/chain") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(function(x) { throw 6 }, assertUnreachable).then(
    assertUnreachable,
    function(x) { assertAsync(x === 6, "resolved/then-throw/then") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "resolved/thenable/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.then(
    function(x) { assertAsync(x === 5, "resolved/thenable/then") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.reject(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "rejected/thenable/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.reject(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.then(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "rejected/thenable/then") }
  )
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/resolve") },
    assertUnreachable
  )
  deferred.resolve(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(
    function(x) { assertAsync(x === 5, "then/resolve") },
    assertUnreachable
  )
  deferred.resolve(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/reject") },
    assertUnreachable
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(p1)
  var p3 = Promise.accept(p2)
  p3.then(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "then/reject") }
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/resolve/thenable") },
    assertUnreachable
  )
  deferred.resolve(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.then(
    function(x) { assertAsync(x === 5, "then/resolve/thenable") },
    assertUnreachable
  )
  deferred.resolve(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/reject/thenable") },
    assertUnreachable
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var p3 = Promise.accept(p2)
  p3.then(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "then/reject/thenable") }
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/resolve2") },
    assertUnreachable
  )
  deferred.resolve(p2)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.then(
    function(x) { assertAsync(x === 5, "then/resolve2") },
    assertUnreachable
  )
  deferred.resolve(p2)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.chain(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "chain/reject2") }
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = Promise.accept(p1)
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.then(
    assertUnreachable,
    function(x) { assertAsync(x === 5, "then/reject2") }
  )
  deferred.reject(5)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.chain(
    function(x) { assertAsync(x === p2, "chain/resolve/thenable2") },
    assertUnreachable
  )
  deferred.resolve(p2)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(5)
  var p2 = {then: function(onResolve, onReject) { onResolve(p1) }}
  var deferred = Promise.defer()
  var p3 = deferred.promise
  p3.then(
    function(x) { assertAsync(x === 5, "then/resolve/thenable2") },
    assertUnreachable
  )
  deferred.resolve(p2)
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(0)
  var p2 = p1.chain(function(x) { return p2 }, assertUnreachable)
  p2.chain(
    assertUnreachable,
    function(r) { assertAsync(r instanceof TypeError, "cyclic/chain") }
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(0)
  var p2 = p1.then(function(x) { return p2 }, assertUnreachable)
  p2.chain(
    assertUnreachable,
    function(r) { assertAsync(r instanceof TypeError, "cyclic/then") }
  )
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p = deferred.promise
  deferred.resolve(p)
  p.chain(
    function(x) { assertAsync(x === p, "cyclic/deferred/chain") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p = deferred.promise
  deferred.resolve(p)
  p.then(
    assertUnreachable,
    function(r) { assertAsync(r instanceof TypeError, "cyclic/deferred/then") }
  )
  assertAsyncRan()
})();

(function() {
  Promise.all({}).chain(
    assertUnreachable,
    function(r) { assertAsync(r instanceof TypeError, "all/no-array") }
  )
  assertAsyncRan()
})();

(function() {
  Promise.all([]).chain(
    function(x) { assertAsync(x.length === 0, "all/resolve/empty") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var deferred1 = Promise.defer()
  var p1 = deferred1.promise
  var deferred2 = Promise.defer()
  var p2 = deferred2.promise
  var deferred3 = Promise.defer()
  var p3 = deferred3.promise
  Promise.all([p1, p2, p3]).chain(
    function(x) {
      assertAsync(x.length === 3, "all/resolve")
      assertAsync(x[0] === 1, "all/resolve/0")
      assertAsync(x[1] === 2, "all/resolve/1")
      assertAsync(x[2] === 3, "all/resolve/2")
    },
    assertUnreachable
  )
  deferred1.resolve(1)
  deferred3.resolve(3)
  deferred2.resolve(2)
  assertAsyncRan()
  assertAsyncRan()
  assertAsyncRan()
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(2)
  var p3 = Promise.defer().promise
  Promise.all([p1, p2, p3]).chain(
    assertUnreachable,
    assertUnreachable
  )
  deferred.resolve(1)
})();

(function() {
  var deferred1 = Promise.defer()
  var p1 = deferred1.promise
  var deferred2 = Promise.defer()
  var p2 = deferred2.promise
  var deferred3 = Promise.defer()
  var p3 = deferred3.promise
  Promise.all([p1, p2, p3]).chain(
    assertUnreachable,
    function(x) { assertAsync(x === 2, "all/reject") }
  )
  deferred1.resolve(1)
  deferred3.resolve(3)
  deferred2.reject(2)
  assertAsyncRan()
})();

(function() {
  Promise.race([]).chain(
    assertUnreachable,
    assertUnreachable
  )
})();

(function() {
  var p1 = Promise.accept(1)
  var p2 = Promise.accept(2)
  var p3 = Promise.accept(3)
  Promise.race([p1, p2, p3]).chain(
    function(x) { assertAsync(x === 1, "resolved/one") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  var p1 = Promise.accept(1)
  var p2 = Promise.accept(2)
  var p3 = Promise.accept(3)
  Promise.race([0, p1, p2, p3]).chain(
    function(x) { assertAsync(x === 0, "resolved-const/one") },
    assertUnreachable
  )
  assertAsyncRan()
})();

(function() {
  Promise.race({}).chain(
    assertUnreachable,
    function(r) { assertAsync(r instanceof TypeError, "one/no-array") }
  )
  assertAsyncRan()
})();

(function() {
  var deferred1 = Promise.defer()
  var p1 = deferred1.promise
  var deferred2 = Promise.defer()
  var p2 = deferred2.promise
  var deferred3 = Promise.defer()
  var p3 = deferred3.promise
  Promise.race([p1, p2, p3]).chain(
    function(x) { assertAsync(x === 3, "one/resolve") },
    assertUnreachable
  )
  deferred3.resolve(3)
  deferred1.resolve(1)
  assertAsyncRan()
})();

(function() {
  var deferred = Promise.defer()
  var p1 = deferred.promise
  var p2 = Promise.accept(2)
  var p3 = Promise.defer().promise
  Promise.race([p1, p2, p3]).chain(
    function(x) { assertAsync(x === 2, "resolved/one") },
    assertUnreachable
  )
  deferred.resolve(1)
  assertAsyncRan()
})();

(function() {
  var deferred1 = Promise.defer()
  var p1 = deferred1.promise
  var deferred2 = Promise.defer()
  var p2 = deferred2.promise
  var deferred3 = Promise.defer()
  var p3 = deferred3.promise
  Promise.race([p1, p2, p3]).chain(
    function(x) { assertAsync(x === 3, "one/resolve/reject") },
    assertUnreachable
  )
  deferred3.resolve(3)
  deferred1.reject(1)
  assertAsyncRan()
})();

(function() {
  var deferred1 = Promise.defer()
  var p1 = deferred1.promise
  var deferred2 = Promise.defer()
  var p2 = deferred2.promise
  var deferred3 = Promise.defer()
  var p3 = deferred3.promise
  Promise.race([p1, p2, p3]).chain(
    assertUnreachable,
    function(x) { assertAsync(x === 3, "one/reject/resolve") }
  )
  deferred3.reject(3)
  deferred1.resolve(1)
  assertAsyncRan()
})();

(function() {
  var log
  function MyPromise(resolver) {
    log += "n"
    var promise = new Promise(function(resolve, reject) {
      resolver(
        function(x) { log += "x" + x; resolve(x) },
        function(r) { log += "r" + r; reject(r) }
      )
    })
    promise.__proto__ = MyPromise.prototype
    return promise
  }

  MyPromise.__proto__ = Promise
  MyPromise.defer = function() {
    log += "d"
    return this.__proto__.defer.call(this)
  }

  MyPromise.prototype.__proto__ = Promise.prototype
  MyPromise.prototype.chain = function(resolve, reject) {
    log += "c"
    return this.__proto__.__proto__.chain.call(this, resolve, reject)
  }

  log = ""
  var p1 = new MyPromise(function(resolve, reject) { resolve(1) })
  var p2 = new MyPromise(function(resolve, reject) { reject(2) })
  var d3 = MyPromise.defer()
  assertTrue(d3.promise instanceof Promise, "subclass/instance")
  assertTrue(d3.promise instanceof MyPromise, "subclass/instance-my3")
  assertTrue(log === "nx1nr2dn", "subclass/create")

  log = ""
  var p4 = MyPromise.resolve(4)
  var p5 = MyPromise.reject(5)
  assertTrue(p4 instanceof Promise, "subclass/instance4")
  assertTrue(p4 instanceof MyPromise, "subclass/instance-my4")
  assertTrue(p5 instanceof Promise, "subclass/instance5")
  assertTrue(p5 instanceof MyPromise, "subclass/instance-my5")
  d3.resolve(3)
  assertTrue(log === "nx4nr5x3", "subclass/resolve")

  log = ""
  var d6 = MyPromise.defer()
  d6.promise.chain(function(x) {
    return new Promise(function(resolve) { resolve(x) })
  }).chain(function() {})
  d6.resolve(6)
  assertTrue(log === "dncncnx6", "subclass/chain")

  log = ""
  Promise.all([11, Promise.accept(12), 13, MyPromise.accept(14), 15, 16])
  assertTrue(log === "nx14cn", "subclass/all/arg")

  log = ""
  MyPromise.all([21, Promise.accept(22), 23, MyPromise.accept(24), 25, 26])
  assertTrue(log === "nx24nnx21cnnx23cncnnx25cnnx26cn", "subclass/all/self")
})();


assertAsyncDone()