diff --git a/src/core/tests/meson.build b/src/core/tests/meson.build
index 78c689f798..31acad9449 100644
--- a/src/core/tests/meson.build
+++ b/src/core/tests/meson.build
@@ -6,6 +6,7 @@ test_units = [
   'test-core',
   'test-core-with-expect',
   'test-dcb',
+  'test-netns',
   'test-l3cfg',
   'test-utils',
   'test-wired-defname',
diff --git a/src/core/tests/test-netns.c b/src/core/tests/test-netns.c
new file mode 100644
index 0000000000..e54c99e813
--- /dev/null
+++ b/src/core/tests/test-netns.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "src/core/nm-default-daemon.h"
+
+#include "nm-netns.h"
+#include "nm-test-utils-core.h"
+
+static void
+test_shared_ip(void)
+{
+    gs_unref_object NMPlatform *platform = NULL;
+    gs_unref_object NMNetns    *netns    = NULL;
+    NMNetnsSharedIPHandle      *handles[256];
+    NMNetnsSharedIPHandle      *handle1;
+    NMNetnsSharedIPHandle      *handle2;
+    char                        buf[NM_INET_ADDRSTRLEN];
+    guint                       i;
+
+    platform = g_object_ref(NM_PLATFORM_GET);
+    netns    = nm_netns_new(platform);
+
+    /* Allocate addresses from 10.42.0.1 to 10.42.255.1 */
+    for (i = 0; i < 256; i++) {
+        handles[i] = nm_netns_shared_ip_reserve(netns);
+        g_snprintf(buf, sizeof(buf), "10.42.%u.1", i);
+        nmtst_assert_ip4_address(handles[i]->addr, buf);
+        g_assert_cmpint(handles[i]->_ref_count, ==, 1);
+    }
+
+    /* Release an address and get it back */
+    nm_netns_shared_ip_release(handles[139]);
+    handles[139] = nm_netns_shared_ip_reserve(netns);
+    nmtst_assert_ip4_address(handles[139]->addr, "10.42.139.1");
+
+    /* Reuse 10.42.255.1 once */
+    NMTST_EXPECT_NM_ERROR(
+        "netns[*]: shared-ip4: ran out of shared IP addresses. Reuse 10.42.255.1/24");
+    handle1 = nm_netns_shared_ip_reserve(netns);
+    g_test_assert_expected_messages();
+    nmtst_assert_ip4_address(handle1->addr, "10.42.255.1");
+    g_assert_cmpint(handle1->_ref_count, ==, 2);
+
+    /* Reuse 10.42.255.1 twice */
+    handle2 = nm_netns_shared_ip_reserve(netns);
+    g_assert(handle2 == handle1);
+    nmtst_assert_ip4_address(handle1->addr, "10.42.255.1");
+    g_assert_cmpint(handle2->_ref_count, ==, 3);
+
+    /* Release all */
+    nm_netns_shared_ip_release(handle1);
+    nm_netns_shared_ip_release(handle2);
+    for (i = 0; i < 256; i++) {
+        nm_netns_shared_ip_release(handles[i]);
+    }
+}
+
+/*****************************************************************************/
+
+NMTST_DEFINE();
+
+int
+main(int argc, char **argv)
+{
+    nmtst_init_with_logging(&argc, &argv, NULL, "ALL");
+    nm_linux_platform_setup();
+
+    g_test_add_func("/netns/shared_ip", test_shared_ip);
+
+    return g_test_run();
+}