diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..3c25e3e
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "test/gtest"]
+	path = test/gtest
+	url = https://github.com/google/googletest.git
diff --git a/test/gtest b/test/gtest
new file mode 160000
index 0000000..c994585
--- /dev/null
+++ b/test/gtest
@@ -0,0 +1 @@
+Subproject commit c99458533a9b4c743ed51537e25989ea55944908