diff --git a/.gitmodules b/.gitmodules
index 805b415..f01abca 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "3rdparty/getopt"]
 	path = 3rdparty/getopt
 	url = https://github.com/skandhurkat/Getopt-for-Visual-Studio
+[submodule "3rdparty/cxxtest"]
+	path = 3rdparty/cxxtest
+	url = https://github.com/CxxTest/cxxtest
diff --git a/3rdparty/cxxtest b/3rdparty/cxxtest
new file mode 160000
index 0000000..a19f85f
--- /dev/null
+++ b/3rdparty/cxxtest
@@ -0,0 +1 @@
+Subproject commit a19f85fdf90f97e16d6e3e7e3d2d68c31cd89e3c