1//===-- FunctionTests.cpp -------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#include "support/Function.h"
10#include "gmock/gmock.h"
11#include "gtest/gtest.h"
12
13namespace clang {
14namespace clangd {
15namespace {
16
17TEST(EventTest, Subscriptions) {
18 Event<int> E;
19 int N = 0;
20 {
21 Event<int>::Subscription SubA;
22 // No subscriptions are active.
23 E.broadcast(V: 42);
24 EXPECT_EQ(0, N);
25
26 Event<int>::Subscription SubB = E.observe(L: [&](int) { ++N; });
27 // Now one is active.
28 E.broadcast(V: 42);
29 EXPECT_EQ(1, N);
30
31 SubA = E.observe(L: [&](int) { ++N; });
32 // Both are active.
33 EXPECT_EQ(1, N);
34 E.broadcast(V: 42);
35 EXPECT_EQ(3, N);
36
37 SubA = std::move(SubB);
38 // One is active.
39 EXPECT_EQ(3, N);
40 E.broadcast(V: 42);
41 EXPECT_EQ(4, N);
42 }
43 // None are active.
44 EXPECT_EQ(4, N);
45 E.broadcast(V: 42);
46 EXPECT_EQ(4, N);
47}
48
49} // namespace
50} // namespace clangd
51} // namespace clang
52

source code of clang-tools-extra/clangd/unittests/support/FunctionTests.cpp