text: /*
   * Copyright 2016 Facebook, Inc.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  #include <gtest/gtest.h>
  
  #include <folly/futures/Future.h>
  
  using namespace folly;
  
  // A simple scenario for the unwrap call, when the promise was fulfilled
  // before calling to unwrap.
  TEST(Unwrap, simpleScenario) {
    Future<int> encapsulated_future = makeFuture(5484);
    Future<Future<int>> future = makeFuture(std::move(encapsulated_future));
    EXPECT_EQ(5484, future.unwrap().value());
  }
  
  // Makes sure that unwrap() works when chaning Future's commands.
  TEST(Unwrap, chainCommands) {
    Future<Future<int>> future = makeFuture(makeFuture(5484));
    auto unwrapped = future.unwrap().then([](int i){ return i; });
    EXPECT_EQ(5484, unwrapped.value());
  }
  
  // Makes sure that the unwrap call also works when the promise was not yet
  // fulfilled, and that the returned Future<T> becomes ready once the promise
  // is fulfilled.
  TEST(Unwrap, futureNotReady) {
    Promise<Future<int>> p;
    Future<Future<int>> future = p.getFuture();
    Future<int> unwrapped = future.unwrap();
    // Sanity - should not be ready before the promise is fulfilled.
    ASSERT_FALSE(unwrapped.isReady());
    // Fulfill the promise and make sure the unwrapped future is now ready.
    p.setValue(makeFuture(5484));
    ASSERT_TRUE(unwrapped.isReady());
    EXPECT_EQ(5484, unwrapped.value());
  }
  