diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d41dd11
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests/googletest"]
+	path = tests/googletest
+	url = https://github.com/google/googletest.git
diff --git a/tests/googletest b/tests/googletest
new file mode 160000
index 0000000..73a63ea
--- /dev/null
+++ b/tests/googletest
@@ -0,0 +1 @@
+Subproject commit 73a63ea05dc8ca29ec1d2c1d66481dd0de1950f1