diff --git a/tests/directory.hpp b/tests/directory.hpp
index 5c441b4..9b2721a 100755
--- a/tests/directory.hpp
+++ b/tests/directory.hpp
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <boost/filesystem.hpp>
+#include <boost/filesystem/fstream.hpp>
 #include <boost/thread.hpp>
 #include <fstream>
 
@@ -76,6 +77,19 @@ class directory
         BOOST_REQUIRE(boost::filesystem::equivalent(boost::filesystem::current_path(), boost::filesystem::initial_path()));
     }
 
+    void write_file(const char *file, const char *buffer)
+    {
+        boost::filesystem::current_path(full_path);
+        BOOST_REQUIRE(boost::filesystem::equivalent(full_path, boost::filesystem::current_path()));
+        BOOST_REQUIRE(boost::filesystem::exists(file));
+        boost::filesystem::ofstream ofs(file);
+        BOOST_CHECK(ofs);
+        ofs << buffer;
+        ofs.close();
+        boost::filesystem::current_path(boost::filesystem::initial_path());
+        BOOST_REQUIRE(boost::filesystem::equivalent(boost::filesystem::current_path(), boost::filesystem::initial_path()));
+    }
+
 private:
     boost::filesystem::path full_path;
 };
diff --git a/tests/test_async.cpp b/tests/test_async.cpp
index 9b6e2e6..52fb516 100755
--- a/tests/test_async.cpp
+++ b/tests/test_async.cpp
@@ -47,16 +47,6 @@ void rename_file_handler_new(const boost::filesystem::path& expected_path, const
     BOOST_CHECK_EQUAL(ev.type, boost::asio::dir_monitor_event::renamed_new_name);
 }
 
-void modify_file_handler(const boost::system::error_code &ec, const boost::asio::dir_monitor_event &ev)
-{
-    boost::filesystem::path fullpath = boost::filesystem::canonical(TEST_DIR1);
-    fullpath /= TEST_FILE2;
-
-    BOOST_CHECK_EQUAL(ec, boost::system::error_code());
-    BOOST_CHECK_EQUAL(ev.path, fullpath);
-    BOOST_CHECK_EQUAL(ev.type, boost::asio::dir_monitor_event::modified);
-}
-
 BOOST_AUTO_TEST_CASE(rename_file)
 {
     directory dir(TEST_DIR1);
@@ -76,6 +66,28 @@ BOOST_AUTO_TEST_CASE(rename_file)
     io_service.reset();
 }
 
+void modify_file_handler(const boost::filesystem::path& expected_path, const boost::system::error_code &ec, const boost::asio::dir_monitor_event &ev)
+{
+    BOOST_CHECK_EQUAL(ec, boost::system::error_code());
+    BOOST_CHECK_THE_SAME_PATHS_RELATIVE(ev.path, expected_path);
+    BOOST_CHECK_EQUAL(ev.type, boost::asio::dir_monitor_event::modified);
+}
+
+BOOST_AUTO_TEST_CASE(modify_file)
+{
+    directory dir(TEST_DIR1);
+    auto test_file2 = dir.create_file(TEST_FILE2);
+
+    boost::asio::dir_monitor dm(io_service);
+    dm.add_directory(TEST_DIR1);
+
+    dir.write_file(TEST_FILE2, TEST_FILE1);
+
+    dm.async_monitor(boost::bind(&modify_file_handler, boost::ref(test_file2), _1, _2));
+    io_service.run();
+    io_service.reset();
+}
+
 void remove_file_handler(const boost::filesystem::path& expected_path, const boost::system::error_code &ec, const boost::asio::dir_monitor_event &ev)
 {
     BOOST_CHECK_EQUAL(ec, boost::system::error_code());
diff --git a/tests/test_sync.cpp b/tests/test_sync.cpp
index eb70fe3..85b4362 100755
--- a/tests/test_sync.cpp
+++ b/tests/test_sync.cpp
@@ -65,6 +65,22 @@ BOOST_AUTO_TEST_CASE(remove_file)
     BOOST_CHECK_EQUAL(ev.type, boost::asio::dir_monitor_event::removed);
 }
 
+BOOST_AUTO_TEST_CASE(modify_file)
+{
+    directory dir(TEST_DIR1);
+    auto test_file1 = dir.create_file(TEST_FILE1);
+
+    boost::asio::dir_monitor dm(io_service);
+    dm.add_directory(TEST_DIR1);
+
+    dir.write_file(TEST_FILE1, TEST_FILE2);
+
+    boost::asio::dir_monitor_event ev = dm.monitor();
+
+    BOOST_CHECK_THE_SAME_PATHS_RELATIVE(ev.path, test_file1);
+    BOOST_CHECK_EQUAL(ev.type, boost::asio::dir_monitor_event::modified);
+}
+
 BOOST_AUTO_TEST_CASE(multiple_events)
 {
     directory dir(TEST_DIR1);