diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index 4943bfa689..4c33748fc4 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -358,6 +358,9 @@ static void test_exec_restrictnamespaces(Manager *m) {
         test(m, "exec-restrictnamespaces-yes.service", 1, CLD_EXITED);
         test(m, "exec-restrictnamespaces-mnt.service", 0, CLD_EXITED);
         test(m, "exec-restrictnamespaces-mnt-blacklist.service", 1, CLD_EXITED);
+        test(m, "exec-restrictnamespaces-merge-and.service", 0, CLD_EXITED);
+        test(m, "exec-restrictnamespaces-merge-or.service", 0, CLD_EXITED);
+        test(m, "exec-restrictnamespaces-merge-all.service", 0, CLD_EXITED);
 #endif
 }
 
diff --git a/test/meson.build b/test/meson.build
index 7c20788d0d..162f63f1ed 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -99,6 +99,9 @@ test_data_files = '''
         test-execute/exec-readonlypaths-with-bindpaths.service
         test-execute/exec-readonlypaths.service
         test-execute/exec-readwritepaths-mount-propagation.service
+        test-execute/exec-restrictnamespaces-merge-all.service
+        test-execute/exec-restrictnamespaces-merge-and.service
+        test-execute/exec-restrictnamespaces-merge-or.service
         test-execute/exec-restrictnamespaces-mnt-blacklist.service
         test-execute/exec-restrictnamespaces-mnt.service
         test-execute/exec-restrictnamespaces-no.service
diff --git a/test/test-execute/exec-restrictnamespaces-merge-all.service b/test/test-execute/exec-restrictnamespaces-merge-all.service
new file mode 100644
index 0000000000..de98cd0a2e
--- /dev/null
+++ b/test/test-execute/exec-restrictnamespaces-merge-all.service
@@ -0,0 +1,8 @@
+[Unit]
+Description=Test merging RestrictNamespaces= with all flags
+
+[Service]
+RestrictNamespaces=mnt pid cgroup net uts ipc user
+RestrictNamespaces=net
+ExecStart=unshare -m -u -i -n -p -f
+Type=oneshot
diff --git a/test/test-execute/exec-restrictnamespaces-merge-and.service b/test/test-execute/exec-restrictnamespaces-merge-and.service
new file mode 100644
index 0000000000..6702e6aab2
--- /dev/null
+++ b/test/test-execute/exec-restrictnamespaces-merge-and.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Test merging RestrictNamespaces= with AND
+
+[Service]
+RestrictNamespaces=mnt pid
+RestrictNamespaces=~mnt usr
+ExecStart=unshare -p -f
+ExecStart=sh -c '! unshare -m -u -i -n'
+Type=oneshot
diff --git a/test/test-execute/exec-restrictnamespaces-merge-or.service b/test/test-execute/exec-restrictnamespaces-merge-or.service
new file mode 100644
index 0000000000..a52455204d
--- /dev/null
+++ b/test/test-execute/exec-restrictnamespaces-merge-or.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Test merging RestrictNamespaces= with OR
+
+[Service]
+RestrictNamespaces=mnt pid
+RestrictNamespaces=mnt uts
+ExecStart=unshare -m -u -p -f
+ExecStart=sh -c '! unshare -u -i -n'
+Type=oneshot