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test/async_manual_reset_event_tests.cpp

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+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Lewis Baker
+// Licenced under MIT license. See LICENSE.txt for details.
+///////////////////////////////////////////////////////////////////////////////
+
+#include <cppcoro/async_manual_reset_event.hpp>
+
+#include <cppcoro/task.hpp>
+#include <cppcoro/sync_wait.hpp>
+#include <cppcoro/when_all_ready.hpp>
+
+#include "doctest/cppcoro_doctest.h"
+
+TEST_SUITE_BEGIN("async_manual_reset_event");
+
+TEST_CASE("default constructor initially not set")
+{
+	cppcoro::async_manual_reset_event event;
+	CHECK(!event.is_set());
+}
+
+TEST_CASE("construct event initially set")
+{
+	cppcoro::async_manual_reset_event event{ true };
+	CHECK(event.is_set());
+}
+
+TEST_CASE("set and reset")
+{
+	cppcoro::async_manual_reset_event event;
+	CHECK(!event.is_set());
+	event.set();
+	CHECK(event.is_set());
+	event.set();
+	CHECK(event.is_set());
+	event.reset();
+	CHECK(!event.is_set());
+	event.reset();
+	CHECK(!event.is_set());
+	event.set();
+	CHECK(event.is_set());
+}
+
+TEST_CASE("await not set event")
+{
+	cppcoro::async_manual_reset_event event;
+
+	auto createWaiter = [&](bool& flag) -> cppcoro::task<>
+	{
+		co_await event;
+		flag = true;
+	};
+
+	bool completed1 = false;
+	bool completed2 = false;
+
+	auto check = [&]() -> cppcoro::task<>
+	{
+		CHECK(!completed1);
+		CHECK(!completed2);
+
+		event.reset();
+
+		CHECK(!completed1);
+		CHECK(!completed2);
+
+		event.set();
+
+		CHECK(completed1);
+		CHECK(completed2);
+
+		co_return;
+	};
+
+	cppcoro::sync_wait(cppcoro::when_all_ready(
+		createWaiter(completed1),
+		createWaiter(completed2),
+		check()));
+}
+
+TEST_CASE("awaiting already set event doesn't suspend")
+{
+	cppcoro::async_manual_reset_event event{ true };
+
+	auto createWaiter = [&]() -> cppcoro::task<>
+	{
+		co_await event;
+	};
+
+	// Should complete without blocking.
+	cppcoro::sync_wait(cppcoro::when_all_ready(
+		createWaiter(),
+		createWaiter()));
+}
+
+TEST_SUITE_END();