1/*
2 * Copyright 2015-present Facebook, Inc.
3 *
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
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
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.
15 */
16
17#include <memory>
18#include <mutex>
19
20#include <folly/futures/Future.h>
21#include <folly/portability/GTest.h>
22
23using namespace folly;
24
25TEST(When, predicateFalse) {
26 int i = 0;
27 auto thunk = [&] { return makeFuture().thenValue([&](auto&&) { i += 1; }); };
28
29 // false
30 auto f1 = folly::when(false, thunk);
31 f1.wait();
32 EXPECT_EQ(0, i);
33}
34
35TEST(When, predicateTrue) {
36 int i = 0;
37 auto thunk = [&] { return makeFuture().thenValue([&](auto&&) { i += 1; }); };
38
39 // true
40 auto f2 = folly::when(true, thunk);
41 f2.wait();
42 EXPECT_EQ(1, i);
43}
44