diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..2835927
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,9 @@
+[submodule "test/test_helper/bats-support"]
+	path = test/test_helper/bats-support
+	url = https://github.com/ztombol/bats-support
+[submodule "test/test_helper/bats-file"]
+	path = test/test_helper/bats-file
+	url = https://github.com/bats-core/bats-file
+[submodule "test/test_helper/bats-asser"]
+	path = test/test_helper/bats-asser
+	url = https://github.com/ztombol/bats-assert
diff --git a/test/test_helper/bats-asser b/test/test_helper/bats-asser
new file mode 160000
index 0000000..9f88b42
--- /dev/null
+++ b/test/test_helper/bats-asser
@@ -0,0 +1 @@
+Subproject commit 9f88b4207da750093baabc4e3f41bf68f0dd3630
diff --git a/test/test_helper/bats-file b/test/test_helper/bats-file
new file mode 160000
index 0000000..17fa557
--- /dev/null
+++ b/test/test_helper/bats-file
@@ -0,0 +1 @@
+Subproject commit 17fa557f6fe28a327933e3fa32efef1d211caa5a
diff --git a/test/test_helper/bats-support b/test/test_helper/bats-support
new file mode 160000
index 0000000..004e707
--- /dev/null
+++ b/test/test_helper/bats-support
@@ -0,0 +1 @@
+Subproject commit 004e707638eedd62e0481e8cdc9223ad471f12ee