2 * Copyright 2016 Facebook, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include <folly/futures/Future.h>
18 #include <folly/portability/GTest.h>
20 using namespace folly;
22 // A simple scenario for the unwrap call, when the promise was fulfilled
23 // before calling to unwrap.
24 TEST(Unwrap, simpleScenario) {
25 Future<int> encapsulated_future = makeFuture(5484);
26 Future<Future<int>> future = makeFuture(std::move(encapsulated_future));
27 EXPECT_EQ(5484, future.unwrap().value());
30 // Makes sure that unwrap() works when chaning Future's commands.
31 TEST(Unwrap, chainCommands) {
32 Future<Future<int>> future = makeFuture(makeFuture(5484));
33 auto unwrapped = future.unwrap().then([](int i){ return i; });
34 EXPECT_EQ(5484, unwrapped.value());
37 // Makes sure that the unwrap call also works when the promise was not yet
38 // fulfilled, and that the returned Future<T> becomes ready once the promise
40 TEST(Unwrap, futureNotReady) {
41 Promise<Future<int>> p;
42 Future<Future<int>> future = p.getFuture();
43 Future<int> unwrapped = future.unwrap();
44 // Sanity - should not be ready before the promise is fulfilled.
45 ASSERT_FALSE(unwrapped.isReady());
46 // Fulfill the promise and make sure the unwrapped future is now ready.
47 p.setValue(makeFuture(5484));
48 ASSERT_TRUE(unwrapped.isReady());
49 EXPECT_EQ(5484, unwrapped.value());