diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..1d6ac24
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "tests/igloo"]
+	path = tests/igloo
+	url = https://github.com/joakimkarlsson/igloo
diff --git a/tests/igloo b/tests/igloo
new file mode 160000
index 0000000..86188c1
--- /dev/null
+++ b/tests/igloo
@@ -0,0 +1 @@
+Subproject commit 86188c1f283483305686de2ac6b9989d2ddcd960