diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000000..2117c4bb49
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "test/input"]
+	path = test/input
+	url = https://github.com/IfcOpenShell/files
diff --git a/test/input b/test/input
new file mode 160000
index 0000000000..2abd02c2a3
--- /dev/null
+++ b/test/input
@@ -0,0 +1 @@
+Subproject commit 2abd02c2a3078fa52601dd8d5c9630c982a0e25c