diff --git a/.gitmodules b/.gitmodules
index 2c4728e..59fc63d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -13,3 +13,9 @@
 [submodule "tests/_support_data/test-repo-different-tags"]
 	path = tests/_support_data/test-repo-different-tags
 	url = https://git.sw3.cz/kamikaze/test-repo-different-tags.git
+[submodule "tests/_support_data/test-repo-submodules"]
+	path = tests/_support_data/test-repo-submodules
+	url = https://git.sw3.cz/kamikaze/test-repo-submodules.git
+[submodule "tests/_support_data/test-repo-submodules-multilevel"]
+	path = tests/_support_data/test-repo-submodules-multilevel
+	url = https://git.sw3.cz/kamikaze/test-repo-submodules-multilevel.git
diff --git a/tests/_support_data/test-repo-submodules b/tests/_support_data/test-repo-submodules
new file mode 160000
index 0000000..1946eeb
--- /dev/null
+++ b/tests/_support_data/test-repo-submodules
@@ -0,0 +1 @@
+Subproject commit 1946eeb4dda03473e796a8cc78b1946fc85df0fd
diff --git a/tests/_support_data/test-repo-submodules-multilevel b/tests/_support_data/test-repo-submodules-multilevel
new file mode 160000
index 0000000..036b63b
--- /dev/null
+++ b/tests/_support_data/test-repo-submodules-multilevel
@@ -0,0 +1 @@
+Subproject commit 036b63b501e4bef54b8c623254ad038d2665a489