Common/Event: Add unit tests

src/common-tests/event_tests.cpp

@@ -0,0 +1,79 @@
+#include "common/event.h"
+#include "gtest/gtest.h"
+#include <atomic>
+#include <chrono>
+#include <thread>
+
+TEST(Event, InitialStateUnsignaled)
+{
+  Common::Event e;
+  ASSERT_FALSE(e.TryWait(1));
+}
+
+TEST(Event, SignalOnSameThread)
+{
+  Common::Event e;
+  e.Signal();
+  ASSERT_TRUE(e.TryWait(1));
+}
+
+TEST(Event, SignalOnSecondThread)
+{
+  Common::Event e;
+
+  std::thread thr([&e]() { e.Signal(); });
+  e.Wait();
+  thr.join();
+}
+
+TEST(Event, SignalOnSecondThreadWithDelay)
+{
+  Common::Event e;
+  std::atomic_bool fl{false};
+
+  std::thread thr([&e, &fl]() {
+    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    e.Signal();
+    fl.store(true);
+  });
+  ASSERT_FALSE(fl.load());
+  e.Wait();
+  ASSERT_TRUE(fl.load());
+  thr.join();
+}
+
+TEST(Event, ResetAfterSignaling)
+{
+  Common::Event e;
+
+  e.Signal();
+  e.Reset();
+
+  ASSERT_FALSE(e.TryWait(1));
+}
+
+TEST(Event, WaitForMultiple)
+{
+  Common::Event e1, e2;
+  e1.Signal();
+  e2.Signal();
+
+  Common::Event* events[] = { &e1, &e2 };
+  Common::Event::WaitForMultiple(events, countof(events));
+}
+
+TEST(Event, AutoReset)
+{
+  Common::Event e(true);
+  e.Signal();
+  ASSERT_TRUE(e.TryWait(1));
+  ASSERT_FALSE(e.TryWait(1));
+}
+
+TEST(Event, NoAutoReset)
+{
+  Common::Event e(false);
+  e.Signal();
+  ASSERT_TRUE(e.TryWait(1));
+  ASSERT_TRUE(e.TryWait(1));
+}