diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..356ba0a
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "tests/helpers/bats-assert"]
+	path = tests/helpers/bats-assert
+	url = https://github.com/bats-core/bats-assert.git
+[submodule "tests/helpers/bats-support"]
+	path = tests/helpers/bats-support
+	url = https://github.com/bats-core/bats-support.git
diff --git a/tests/helpers/bats-assert b/tests/helpers/bats-assert
new file mode 160000
index 0000000..ffe84ea
--- /dev/null
+++ b/tests/helpers/bats-assert
@@ -0,0 +1 @@
+Subproject commit ffe84ea5dd43b568851549b3e241db150c12929c
diff --git a/tests/helpers/bats-support b/tests/helpers/bats-support
new file mode 160000
index 0000000..3c8fadc
--- /dev/null
+++ b/tests/helpers/bats-support
@@ -0,0 +1 @@
+Subproject commit 3c8fadc5097c9acfc96d836dced2bb598e48b009