diff --git a/t/t7609-mergetool--lib.sh b/t/t7609-mergetool--lib.sh
new file mode 100755
index 0000000000..d848fe6442
--- /dev/null
+++ b/t/t7609-mergetool--lib.sh
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+test_description='git mergetool
+
+Testing basic merge tools options'
+
+. ./test-lib.sh
+
+test_expect_success 'mergetool --tool=vimdiff creates the expected layout' '
+	. $GIT_BUILD_DIR/mergetools/vimdiff &&
+	run_unit_tests
+'
+
+test_done