test: add sync_wait tests

test/coro/CMakeLists.txt

@@ -5,6 +5,7 @@ add_gap_test(test-gap-coro
     generator.cpp
     recursive_generator.cpp
     shared_task.cpp
+    sync_wait.cpp
     task.cpp
     when_all_ready.cpp
 )

test/coro/sync_wait.cpp

@@ -0,0 +1,68 @@
+// Copyright (c) 2021-present, Trail of Bits, Inc.
+
+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) Lewis Baker
+// Licenced under MIT license. See LICENSE.txt for details.
+///////////////////////////////////////////////////////////////////////////////
+// This file is a modified version of cppcoro/test/sync_wait.cpp from
+// the cppcoro project. The original file is licenced under the MIT license and
+// the original license is included above.
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef GAP_ENABLE_COROUTINES
+
+    #include <doctest/doctest.h>
+    #include <gap/coro/sync_wait.hpp>
+
+    #include <gap/core/config.hpp>
+    #include <gap/core/on_scope_exit.hpp>
+
+    #include <gap/coro/task.hpp>
+    #include <gap/coro/shared_task.hpp>
+
+    #include <string>
+    #include <type_traits>
+
+using namespace gap::coro;
+
+namespace gap::test
+{
+    TEST_SUITE_BEGIN("sync_wait");
+
+    static_assert(std::is_same<
+        decltype(gap::coro::sync_wait(std::declval<gap::coro::task<std::string>>())),
+        std::string&&>::value);
+    static_assert(std::is_same<
+        decltype(gap::coro::sync_wait(std::declval<gap::coro::task<std::string>&>())),
+        std::string&>::value);
+
+    TEST_CASE("sync_wait(task<T>)")
+    {
+        auto makeTask = []() -> gap::coro::task<std::string>
+        {
+            co_return "foo";
+        };
+
+        auto task = makeTask();
+        CHECK(gap::coro::sync_wait(task) == "foo");
+
+        CHECK(gap::coro::sync_wait(makeTask()) == "foo");
+    }
+
+    TEST_CASE("sync_wait(shared_task<T>)")
+    {
+        auto makeTask = []() -> gap::coro::shared_task<std::string>
+        {
+            co_return "foo";
+        };
+
+        auto task = makeTask();
+
+        CHECK(gap::coro::sync_wait(task) == "foo");
+        CHECK(gap::coro::sync_wait(makeTask()) == "foo");
+    }
+
+    TEST_SUITE_END();
+
+} // namespace gap::test
+#endif