diff --git a/test/alpine.bats b/test/alpine.bats
index 2f39499..b80c6d9 100644
--- a/test/alpine.bats
+++ b/test/alpine.bats
@@ -8,6 +8,18 @@ setup() {
   [ "${lines[0]}" = "app" ]
 }
 
+@test "uid" {
+  run docker run virtualroot/hardened-alpine:3.18 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
+@test "gid" {
+  run docker run virtualroot/hardened-alpine:3.18 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
 @test "workdir" {
   run docker run virtualroot/hardened-alpine:3.18 pwd
   [ $status -eq 0 ]
diff --git a/test/debian.bats b/test/debian.bats
index ee1b875..04f5dba 100644
--- a/test/debian.bats
+++ b/test/debian.bats
@@ -8,6 +8,18 @@ setup() {
   [ "${lines[0]}" = "app" ]
 }
 
+@test "uid" {
+  run docker run virtualroot/hardened-debian:12 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
+@test "gid" {
+  run docker run virtualroot/hardened-debian:12 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
 @test "workdir" {
   run docker run virtualroot/hardened-debian:12 pwd
   [ $status -eq 0 ]
diff --git a/test/ubuntu.bats b/test/ubuntu.bats
index bd56c05..1cc42a9 100644
--- a/test/ubuntu.bats
+++ b/test/ubuntu.bats
@@ -8,6 +8,18 @@ setup() {
   [ "${lines[0]}" = "app" ]
 }
 
+@test "uid" {
+  run docker run virtualroot/hardened-ubuntu:22.04 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
+@test "gid" {
+  run docker run virtualroot/hardened-ubuntu:22.04 id -g
+  [ $status -eq 0 ]
+  [ "${lines[0]}" = "12123" ]
+}
+
 @test "workdir" {
   run docker run virtualroot/hardened-ubuntu:22.04 pwd
   [ $status -eq 0 ]