diff --git a/tests/qemuxml2argvdata/net-user.x86_64-4.0.0.args b/tests/qemuxml2argvdata/net-user.x86_64-4.0.0.args
new file mode 100644
index 0000000000000000000000000000000000000000..d51653dcdddf86d250da45e1c89fcba15d745336
--- /dev/null
+++ b/tests/qemuxml2argvdata/net-user.x86_64-4.0.0.args
@@ -0,0 +1,37 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/tmp/lib/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
+QEMU_AUDIO_DRV=none \
+/usr/bin/qemu-system-i686 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object secret,id=masterKey0,format=raw,\
+file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
+-machine pc-i440fx-4.0,accel=tcg,usb=off,dump-guest-core=off \
+-m 214 \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server,nowait \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-no-acpi \
+-boot strict=on \
+-device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 \
+-drive file=/dev/HostVG/QEMUGuest1,format=raw,if=none,id=drive-ide0-0-0 \
+-device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 \
+-netdev socket,fd=42,id=hostnet0 \
+-device rtl8139,netdev=hostnet0,id=net0,mac=00:11:22:33:44:55,bus=pci.0,\
+addr=0x2 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,\
+resourcecontrol=deny \
+-msg timestamp=on
diff --git a/tests/qemuxml2argvtest.c b/tests/qemuxml2argvtest.c
index 9395cc19a2a553c2d6ac28dfeecd2f83c1cd1245..10f2fa48e640014b4192ec3fd5d8056346bed0f1 100644
--- a/tests/qemuxml2argvtest.c
+++ b/tests/qemuxml2argvtest.c
@@ -17,6 +17,7 @@
 # include "qemu/qemu_domain.h"
 # include "qemu/qemu_migration.h"
 # include "qemu/qemu_process.h"
+# include "qemu/qemu_slirp.h"
 # include "datatypes.h"
 # include "conf/storage_conf.h"
 # include "cpu/cpu_map.h"
@@ -398,6 +399,7 @@ testCheckExclusiveFlags(int flags)
                   FLAG_FIPS |
                   FLAG_REAL_CAPS |
                   FLAG_SKIP_LEGACY_CPUS |
+                  FLAG_SLIRP_HELPER |
                   0, -1);
 
     VIR_EXCLUSIVE_FLAGS_RET(FLAG_REAL_CAPS, FLAG_SKIP_LEGACY_CPUS, -1);
@@ -526,6 +528,19 @@ testCompareXMLToArgv(const void *data)
        }
     }
 
+    if (flags & FLAG_SLIRP_HELPER) {
+        for (i = 0; i < vm->def->nnets; i++) {
+            virDomainNetDefPtr net = vm->def->nets[i];
+
+            if (net->type == VIR_DOMAIN_NET_TYPE_USER &&
+                virQEMUCapsGet(info->qemuCaps, QEMU_CAPS_NET_SOCKET_DGRAM)) {
+                qemuSlirpPtr slirp = qemuSlirpNew();
+                slirp->fd[0] = 42;
+                QEMU_DOMAIN_NETWORK_PRIVATE(net)->slirp = slirp;
+            }
+        }
+    }
+
     if (!(cmd = qemuProcessCreatePretendCmd(&driver, vm, migrateURI,
                                             (flags & FLAG_FIPS), false,
                                             VIR_QEMU_PROCESS_START_COLD))) {
@@ -1284,6 +1299,7 @@ mymain(void)
     DO_TEST_FAILURE("net-vhostuser-fail",
                     QEMU_CAPS_VHOSTUSER_MULTIQUEUE);
     DO_TEST("net-user", NONE);
+    DO_TEST_CAPS_ARCH_VER_FULL("net-user", "x86_64", "4.0.0", ARG_FLAGS, FLAG_SLIRP_HELPER);
     DO_TEST("net-user-addr", NONE);
     DO_TEST("net-virtio", NONE);
     DO_TEST("net-virtio-device",
diff --git a/tests/testutilsqemu.h b/tests/testutilsqemu.h
index 0632141d68fb7f07ec79266b9090a7e5c06ee464..a2f7bfcc2691e26c85a1899f3abce6bcfa7c63d6 100644
--- a/tests/testutilsqemu.h
+++ b/tests/testutilsqemu.h
@@ -51,6 +51,7 @@ typedef enum {
     FLAG_FIPS               = 1 << 2,
     FLAG_REAL_CAPS          = 1 << 3,
     FLAG_SKIP_LEGACY_CPUS   = 1 << 4,
+    FLAG_SLIRP_HELPER       = 1 << 5,
 } testQemuInfoFlags;
 
 struct testQemuInfo {