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# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
import unittest
# pylint: disable=F0401
from mojo.bindings import promise
class PromiseTest(unittest.TestCase):
def setUp(self):
self.accumulated = []
def _AddToAccumulated(self, res):
self.accumulated.append(res)
return res
def testResolve(self):
p = promise.Promise.Resolve(0)
self.assertEquals(p.state, promise.Promise.STATE_FULLFILLED)
p.Then(self._AddToAccumulated)
self.assertEquals(self.accumulated, [0])
def testResolveToPromise(self):
p = promise.Promise.Resolve(0)
self.assertEquals(p.state, promise.Promise.STATE_FULLFILLED)
q = promise.Promise.Resolve(p)
self.assertEquals(p.state, promise.Promise.STATE_FULLFILLED)
q.Then(self._AddToAccumulated)
self.assertEquals(self.accumulated, [0])
def testReject(self):
p = promise.Promise.Reject(0)
self.assertEquals(p.state, promise.Promise.STATE_REJECTED)
p.Then(onRejected=self._AddToAccumulated)
self.assertEquals(self.accumulated, [0])
def testGeneratorFunctionResolve(self):
(p, resolve, _) = _GetPromiseAndFunctions()
self.assertEquals(p.state, promise.Promise.STATE_PENDING)
p.Then(self._AddToAccumulated)
resolve(0)
self.assertEquals(p.state, promise.Promise.STATE_FULLFILLED)
self.assertEquals(self.accumulated, [0])
def testGeneratorFunctionReject(self):
(p, _, reject) = _GetPromiseAndFunctions()
self.assertEquals(p.state, promise.Promise.STATE_PENDING)
p.Then(None, self._AddToAccumulated)
reject(0)
self.assertEquals(p.state, promise.Promise.STATE_REJECTED)
self.assertEquals(self.accumulated, [0])
def testGeneratorFunctionResolveToPromise(self):
(p1, resolve, _) = _GetPromiseAndFunctions()
p2 = promise.Promise(lambda x, y: x(p1))
self.assertEquals(p2.state, promise.Promise.STATE_PENDING)
p2.Then(self._AddToAccumulated)
resolve(promise.Promise.Resolve(0))
self.assertEquals(self.accumulated, [0])
def testComputation(self):
(p, resolve, _) = _GetPromiseAndFunctions()
p.Then(lambda x: x+1).Then(lambda x: x+2).Then(self._AddToAccumulated)
self.assertEquals(self.accumulated, [])
resolve(0)
self.assertEquals(self.accumulated, [3])
def testRecoverAfterException(self):
(p, resolve, _) = _GetPromiseAndFunctions()
p.Then(_ThrowException).Catch(self._AddToAccumulated)
self.assertEquals(self.accumulated, [])
resolve(0)
self.assertEquals(len(self.accumulated), 1)
self.assertIsInstance(self.accumulated[0], RuntimeError)
self.assertEquals(self.accumulated[0].message, 0)
def testMultipleRejectResolve(self):
(p, resolve, reject) = _GetPromiseAndFunctions()
p.Then(self._AddToAccumulated, self._AddToAccumulated)
resolve(0)
self.assertEquals(self.accumulated, [0])
resolve(0)
self.assertEquals(self.accumulated, [0])
reject(0)
self.assertEquals(self.accumulated, [0])
self.accumulated = []
(p, resolve, reject) = _GetPromiseAndFunctions()
p.Then(self._AddToAccumulated, self._AddToAccumulated)
reject(0)
self.assertEquals(self.accumulated, [0])
resolve(0)
self.assertEquals(self.accumulated, [0])
reject(0)
self.assertEquals(self.accumulated, [0])
def testAll(self):
promises_and_functions = [_GetPromiseAndFunctions() for x in xrange(10)]
promises = [x[0] for x in promises_and_functions]
all_promise = promise.Promise.All(*promises)
res = []
def AddToRes(values):
res.append(values)
all_promise.Then(AddToRes, AddToRes)
for i, (_, resolve, _) in enumerate(promises_and_functions):
self.assertEquals(len(res), 0)
resolve(i)
self.assertEquals(len(res), 1)
self.assertEquals(res[0], [i for i in xrange(10)])
self.assertEquals(all_promise.state, promise.Promise.STATE_FULLFILLED)
def testAllFailure(self):
promises_and_functions = [_GetPromiseAndFunctions() for x in xrange(10)]
promises = [x[0] for x in promises_and_functions]
all_promise = promise.Promise.All(*promises)
res = []
def AddToRes(values):
res.append(values)
all_promise.Then(AddToRes, AddToRes)
for i in xrange(10):
if i <= 5:
self.assertEquals(len(res), 0)
else:
self.assertEquals(len(res), 1)
if i != 5:
promises_and_functions[i][1](i)
else:
promises_and_functions[i][2]('error')
self.assertEquals(len(res), 1)
self.assertEquals(res[0], 'error')
self.assertEquals(all_promise.state, promise.Promise.STATE_REJECTED)
def testRace(self):
promises_and_functions = [_GetPromiseAndFunctions() for x in xrange(10)]
promises = [x[0] for x in promises_and_functions]
race_promise = promise.Promise.Race(*promises)
res = []
def AddToRes(values):
res.append(values)
race_promise.Then(AddToRes, AddToRes)
self.assertEquals(len(res), 0)
promises_and_functions[7][1]('success')
self.assertEquals(len(res), 1)
for i, (f) in enumerate(promises_and_functions):
f[1 + (i % 2)](i)
self.assertEquals(len(res), 1)
self.assertEquals(res[0], 'success')
self.assertEquals(race_promise.state, promise.Promise.STATE_FULLFILLED)
def testRaceFailure(self):
promises_and_functions = [_GetPromiseAndFunctions() for x in xrange(10)]
promises = [x[0] for x in promises_and_functions]
race_promise = promise.Promise.Race(*promises)
res = []
def AddToRes(values):
res.append(values)
race_promise.Then(AddToRes, AddToRes)
self.assertEquals(len(res), 0)
promises_and_functions[7][2]('error')
self.assertEquals(len(res), 1)
for i, (f) in enumerate(promises_and_functions):
f[1 + (i % 2)](i)
self.assertEquals(len(res), 1)
self.assertEquals(res[0], 'error')
self.assertEquals(race_promise.state, promise.Promise.STATE_REJECTED)
def _GetPromiseAndFunctions():
functions = {}
def GeneratorFunction(resolve, reject):
functions['resolve'] = resolve
functions['reject'] = reject
p = promise.Promise(GeneratorFunction)
return (p, functions['resolve'], functions['reject'])
def _ThrowException(x):
raise RuntimeError(x)
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