clang-tools-extra/clangd/unittests/support/FunctionTests.cpp

   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
  13 namespace clang {
  14 namespace clangd {
  15 namespace {
  16
  17 TEST(EventTest, Subscriptions) {
  18   Event<int> E;
  19   int N = 0;
  20   {
  21     Event<int>::Subscription SubA;
  22     // No subscriptions are active.
  23     E.broadcast(42);
  24     EXPECT_EQ(0, N);
  25
  26     Event<int>::Subscription SubB = E.observe([&](int) { ++N; });
  27     // Now one is active.
  28     E.broadcast(42);
  29     EXPECT_EQ(1, N);
  30
  31     SubA = E.observe([&](int) { ++N; });
  32     // Both are active.
  33     EXPECT_EQ(1, N);
  34     E.broadcast(42);
  35     EXPECT_EQ(3, N);
  36
  37     SubA = std::move(SubB);
  38     // One is active.
  39     EXPECT_EQ(3, N);
  40     E.broadcast(42);
  41     EXPECT_EQ(4, N);
  42   }
  43   // None are active.
  44   EXPECT_EQ(4, N);
  45   E.broadcast(42);
  46   EXPECT_EQ(4, N);
  47 }
  48
  49 } // namespace
  50 } // namespace clangd
  51 } // namespace clang