diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 9beaec3ac..8cdea977e 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -9,6 +9,7 @@ set(base_test_SOURCES
   base-convert.cpp
   base-dictionary.cpp
   base-fifo.cpp
+  base-io-engine.cpp
   base-json.cpp
   base-match.cpp
   base-netstring.cpp
@@ -76,6 +77,11 @@ add_boost_test(base
     base_dictionary/keys_ordered
     base_fifo/construct
     base_fifo/io
+    base_io_engine/timeout_run
+    base_io_engine/timeout_cancelled
+    base_io_engine/timeout_scope
+    base_io_engine/timeout_due_cancelled
+    base_io_engine/timeout_due_scope
     base_json/encode
     base_json/decode
     base_json/invalid1
diff --git a/test/base-io-engine.cpp b/test/base-io-engine.cpp
new file mode 100644
index 000000000..2261bab91
--- /dev/null
+++ b/test/base-io-engine.cpp
@@ -0,0 +1,143 @@
+/* Icinga 2 | (c) 2024 Icinga GmbH | GPLv2+ */
+
+#include "base/io-engine.hpp"
+#include "base/utility.hpp"
+#include <boost/asio.hpp>
+#include <boost/date_time/posix_time/posix_time.hpp>
+#include <BoostTestTargetConfig.h>
+
+using namespace icinga;
+
+BOOST_AUTO_TEST_SUITE(base_io_engine)
+
+BOOST_AUTO_TEST_CASE(timeout_run)
+{
+	boost::asio::io_context io;
+	boost::asio::io_context::strand strand (io);
+	int called = 0;
+
+	boost::asio::spawn(strand, [&](boost::asio::yield_context yc) {
+		boost::asio::deadline_timer timer (io);
+
+		Timeout::Ptr timeout = new Timeout(io, strand, boost::posix_time::millisec(300), [&called] { ++called; });
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(200));
+		timer.async_wait(yc);
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(200));
+		timer.async_wait(yc);
+	});
+
+	io.run();
+	BOOST_CHECK_EQUAL(called, 1);
+}
+
+BOOST_AUTO_TEST_CASE(timeout_cancelled)
+{
+	boost::asio::io_context io;
+	boost::asio::io_context::strand strand (io);
+	int called = 0;
+
+	boost::asio::spawn(strand, [&](boost::asio::yield_context yc) {
+		boost::asio::deadline_timer timer (io);
+		Timeout::Ptr timeout = new Timeout(io, strand, boost::posix_time::millisec(300), [&called] { ++called; });
+
+		timer.expires_from_now(boost::posix_time::millisec(200));
+		timer.async_wait(yc);
+
+		timeout->Cancel();
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(200));
+		timer.async_wait(yc);
+	});
+
+	io.run();
+	BOOST_CHECK_EQUAL(called, 0);
+}
+
+BOOST_AUTO_TEST_CASE(timeout_scope)
+{
+	boost::asio::io_context io;
+	boost::asio::io_context::strand strand (io);
+	int called = 0;
+
+	boost::asio::spawn(strand, [&](boost::asio::yield_context yc) {
+		boost::asio::deadline_timer timer (io);
+
+		{
+			Timeout::Ptr timeout = new Timeout(io, strand, boost::posix_time::millisec(300), [&called] { ++called; });
+
+			timer.expires_from_now(boost::posix_time::millisec(200));
+			timer.async_wait(yc);
+		}
+
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(200));
+		timer.async_wait(yc);
+	});
+
+	io.run();
+	BOOST_CHECK_EQUAL(called, 0);
+}
+
+BOOST_AUTO_TEST_CASE(timeout_due_cancelled)
+{
+	boost::asio::io_context io;
+	boost::asio::io_context::strand strand (io);
+	int called = 0;
+
+	boost::asio::spawn(strand, [&](boost::asio::yield_context yc) {
+		boost::asio::deadline_timer timer (io);
+		Timeout::Ptr timeout = new Timeout(io, strand, boost::posix_time::millisec(300), [&called] { ++called; });
+
+		// Give the timeout enough time to become due while blocking its strand to prevent it from actually running...
+		Utility::Sleep(0.4);
+
+		BOOST_CHECK_EQUAL(called, 0);
+
+		// ... so that this shall still work:
+		timeout->Cancel();
+
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(100));
+		timer.async_wait(yc);
+	});
+
+	io.run();
+	BOOST_CHECK_EQUAL(called, 0);
+}
+
+BOOST_AUTO_TEST_CASE(timeout_due_scope)
+{
+	boost::asio::io_context io;
+	boost::asio::io_context::strand strand (io);
+	int called = 0;
+
+	boost::asio::spawn(strand, [&](boost::asio::yield_context yc) {
+		boost::asio::deadline_timer timer (io);
+
+		{
+			Timeout::Ptr timeout = new Timeout(io, strand, boost::posix_time::millisec(300), [&called] { ++called; });
+
+			// Give the timeout enough time to become due while blocking its strand to prevent it from actually running...
+			Utility::Sleep(0.4);
+
+			BOOST_CHECK_EQUAL(called, 0);
+		} // ... so that Timeout#~Timeout() shall still work here.
+
+		BOOST_CHECK_EQUAL(called, 0);
+
+		timer.expires_from_now(boost::posix_time::millisec(100));
+		timer.async_wait(yc);
+	});
+
+	io.run();
+	BOOST_CHECK_EQUAL(called, 0);
+}
+
+BOOST_AUTO_TEST_SUITE_END()