diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d155f63
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests/_support_data/test-repo-base"]
+	path = tests/_support_data/test-repo-base
+	url = git@git.sw3.cz:kamikaze/test-repo-base.git
diff --git a/tests/_support_data/test-repo-base b/tests/_support_data/test-repo-base
new file mode 160000
index 0000000..e0c7e2a
--- /dev/null
+++ b/tests/_support_data/test-repo-base
@@ -0,0 +1 @@
+Subproject commit e0c7e2a72579e24657c05e875201011d2b48bf94