diff --git a/test-in-docker.sh b/test-in-docker.sh
index cd8c88a..7bf35ec 100755
--- a/test-in-docker.sh
+++ b/test-in-docker.sh
@@ -59,6 +59,17 @@ test_neptune() {
     '
 }
 
+test_mars() {
+    docker pull docker.io/library/ubuntu:20.04
+    docker run -ti --rm -v ${tmpdir}/dotfiles.tar.gz:/tmp/dotfiles.tar.gz:ro --hostname mars docker.io/library/ubuntu:20.04 sh -c '
+        set -o errexit
+
+        cd $(mktemp -d)
+        tar xf /tmp/dotfiles.tar.gz -C .
+        ANSIBLE_EXTRA_ARGS="-e manage_services=false" ./install.sh
+    '
+}
+
 case "${1:-all}" in
     ares)
         test_ares
@@ -66,8 +77,12 @@ case "${1:-all}" in
     neptune)
         test_neptune
         ;;
+    mars)
+        test_mars
+        ;;
     all)
         test_ares
         test_neptune
+        test_mars
         ;;
 esac