[Buildroot] [git commit branch/2026.05.x] support/testing: mdnsd: new runtime test

commit: https://gitlab.com/buildroot.org/buildroot/-/commit/637f35b9f99ceb34846900cec14996349a2e009a
branch: https://gitlab.com/buildroot.org/buildroot/-/tree/2026.05.x

Boot an armv5 image running the mdnsd responder alongside the mquery
client, then check that service discovery works: mquery browses for the
bundled _http._tcp service and mdnsd, on the same host, answers over the
loopback of the eth0 multicast group.

Signed-off-by: Joachim Wiberg <[email protected]>
[Julien: add "mdnsd -v" invocation to show version]
Signed-off-by: Julien Olivain <[email protected]>
(cherry picked from commit 4cd5559163131e105b837d80389292e1bb6d0fc7)
[Thomas: remove last test that requires v1.1]
Signed-off-by: Thomas Perale <[email protected]>
---
 DEVELOPERS                                  |  1 +
 support/testing/tests/package/test_mdnsd.py | 31 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/DEVELOPERS b/DEVELOPERS
index 3530d515a2..7064e4c281 100644
--- a/DEVELOPERS
+++ b/DEVELOPERS
@@ -1657,6 +1657,7 @@ F:	package/ssdp-responder/
 F:	package/sysklogd/
 F:	package/uredir/
 F:	package/watchdogd/
+F:	support/testing/tests/package/test_mdnsd.py
 
 N:	Jochen Baltes <[email protected]>
 F:	package/altera-stapl
diff --git a/support/testing/tests/package/test_mdnsd.py b/support/testing/tests/package/test_mdnsd.py
new file mode 100644
index 0000000000..ecc93ab6f8
--- /dev/null
+++ b/support/testing/tests/package/test_mdnsd.py
@@ -0,0 +1,31 @@
+import os
+
+import infra.basetest
+
+
+class TestMdnsd(infra.basetest.BRTest):
+    config = infra.basetest.BASIC_TOOLCHAIN_CONFIG + \
+        """
+        BR2_PACKAGE_MDNSD=y
+        BR2_PACKAGE_MDNSD_MQUERY=y
+        BR2_PACKAGE_MDNSD_HTTP_SERVICE=y
+        BR2_SYSTEM_DHCP="eth0"
+        BR2_TARGET_ROOTFS_CPIO=y
+        # BR2_TARGET_ROOTFS_TAR is not set
+        """
+
+    def test_run(self):
+        img = os.path.join(self.builddir, "images", "rootfs.cpio")
+        self.emulator.boot(arch="armv5",
+                           kernel="builtin",
+                           options=["-initrd", img,
+                                    "-net", "nic,model=rtl8139",
+                                    "-net", "user"])
+        self.emulator.login()
+
+        # We check the program can execute.
+        self.assertRunOk("mdnsd -v")
+
+        # The responder is started at boot by /etc/init.d/S50mdnsd and
+        # advertises the bundled _http._tcp service from /etc/mdns.d/.
+        self.assertRunOk("pidof mdnsd")
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