diff --git a/.gitmodules b/.gitmodules
index c527cf1..dc270e5 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "test/test_helper/bats-support"]
 	path = test/test_helper/bats-support
 	url = https://github.com/ztombol/bats-support
+[submodule "test/test_helper/bats-assert"]
+	path = test/test_helper/bats-assert
+	url = https://github.com/ztombol/bats-assert
diff --git a/test/test_helper/bats-assert b/test/test_helper/bats-assert
new file mode 160000
index 0000000..9f88b42
--- /dev/null
+++ b/test/test_helper/bats-assert
@@ -0,0 +1 @@
+Subproject commit 9f88b4207da750093baabc4e3f41bf68f0dd3630