diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..16b40a6
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "lib/gtest/googletest"]
+	path = lib/gtest/googletest
+	url = https://github.com/google/googletest.git
diff --git a/lib/gtest/googletest b/lib/gtest/googletest
new file mode 160000
index 0000000..a2b8a8e
--- /dev/null
+++ b/lib/gtest/googletest
@@ -0,0 +1 @@
+Subproject commit a2b8a8e07628e5fd60644b6dd99c1b5e7d7f1f47