diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..5a4e85a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "third_party/googletest"]
+	path = third_party/googletest
+	url = https://github.com/google/googletest.git
diff --git a/third_party/googletest b/third_party/googletest
new file mode 160000
index 0000000..b796f7d
--- /dev/null
+++ b/third_party/googletest
@@ -0,0 +1 @@
+Subproject commit b796f7d44681514f58a683a3a71ff17c94edb0c1