split up the async_system test

test/async_system_stackless.cpp

@@ -0,0 +1,69 @@
+// Copyright (c) 2016 Klemens D. Morgenstern
+//
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#define BOOST_TEST_MAIN
+#define BOOST_TEST_IGNORE_SIGCHLD
+#include <boost/test/included/unit_test.hpp>
+
+#include <boost/process/error.hpp>
+#include <boost/process/io.hpp>
+#include <boost/process/async.hpp>
+#include <boost/process/child.hpp>
+#include <boost/process/async_system.hpp>
+
+#include <string>
+#include <boost/asio/io_context.hpp>
+#include <boost/asio/spawn.hpp>
+#include <boost/asio/coroutine.hpp>
+#include <boost/asio/use_future.hpp>
+#include <boost/asio/yield.hpp>
+
+#include <vector>
+#include <array>
+
+namespace bp = boost::process;
+
+BOOST_AUTO_TEST_CASE(stackless, *boost::unit_test::timeout(15))
+{
+    using boost::unit_test::framework::master_test_suite;
+
+    boost::asio::io_context ios;
+
+    bool did_something_else = false;
+
+    struct stackless_t : boost::asio::coroutine
+    {
+        boost::asio::io_context & ios;
+        bool & did_something_else;
+
+        stackless_t(boost::asio::io_context & ios_,
+                    bool & did_something_else)
+                        : ios(ios_), did_something_else(did_something_else) {}
+        void operator()(
+                boost::system::error_code ec = boost::system::error_code(),
+                std::size_t exit_code = 0)
+        {
+            if (!ec) reenter (this)
+            {
+                yield bp::async_system(
+                        ios, *this,
+                        master_test_suite().argv[1],
+                        "test", "--exit-code", "42");
+
+                BOOST_CHECK_EQUAL(exit_code, 42);
+                BOOST_CHECK(did_something_else);
+            }
+        }
+    } stackless{ios, did_something_else};
+
+    ios.post([&]{stackless();});
+    ios.post([&]{did_something_else = true;});
+
+    ios.run();
+
+    BOOST_CHECK(did_something_else);
+}
+
+