diff --git a/.gitmodules b/.gitmodules
index d155f63..2c4728e 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,15 @@
 [submodule "tests/_support_data/test-repo-base"]
 	path = tests/_support_data/test-repo-base
 	url = git@git.sw3.cz:kamikaze/test-repo-base.git
+[submodule "tests/_support_data/test-repo-reduced"]
+	path = tests/_support_data/test-repo-reduced
+	url = https://git.sw3.cz/kamikaze/test-repo-reduced.git
+[submodule "tests/_support_data/test-repo-new-commits"]
+	path = tests/_support_data/test-repo-new-commits
+	url = https://git.sw3.cz/kamikaze/test-repo-new-commits.git
+[submodule "tests/_support_data/test-repo-changed-branches"]
+	path = tests/_support_data/test-repo-changed-branches
+	url = https://git.sw3.cz/kamikaze/test-repo-changed-branches.git
+[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
diff --git a/tests/_support_data/test-repo-changed-branches b/tests/_support_data/test-repo-changed-branches
new file mode 160000
index 0000000..e0c7e2a
--- /dev/null
+++ b/tests/_support_data/test-repo-changed-branches
@@ -0,0 +1 @@
+Subproject commit e0c7e2a72579e24657c05e875201011d2b48bf94
diff --git a/tests/_support_data/test-repo-different-tags b/tests/_support_data/test-repo-different-tags
new file mode 160000
index 0000000..e0c7e2a
--- /dev/null
+++ b/tests/_support_data/test-repo-different-tags
@@ -0,0 +1 @@
+Subproject commit e0c7e2a72579e24657c05e875201011d2b48bf94
diff --git a/tests/_support_data/test-repo-new-commits b/tests/_support_data/test-repo-new-commits
new file mode 160000
index 0000000..f110a67
--- /dev/null
+++ b/tests/_support_data/test-repo-new-commits
@@ -0,0 +1 @@
+Subproject commit f110a678f5c5a71c8f61bd7d88eeb9c729fd2b38
diff --git a/tests/_support_data/test-repo-reduced b/tests/_support_data/test-repo-reduced
new file mode 160000
index 0000000..e0c7e2a
--- /dev/null
+++ b/tests/_support_data/test-repo-reduced
@@ -0,0 +1 @@
+Subproject commit e0c7e2a72579e24657c05e875201011d2b48bf94