[PATCH 7/7] tests/functional: Add Sun-3 firmware boot and diagnostic test

[54weasels <54weasels@gmail.com>]

This adds an integration test that downloads the Sun-3/60 Boot PROM, initializes the machine, and ensures the self-test successfully routes to TTY A.

Signed-off-by: 54weasels <54weasels@gmail.com>
---
 tests/functional/m68k/meson.build   |  1 +
 tests/functional/m68k/test_sun3.py  | 34 +++++++++++++++++++++++++++++
 tests/functional/qemu_test/asset.py | 11 +++++-----
 3 files changed, 41 insertions(+), 5 deletions(-)
 create mode 100755 tests/functional/m68k/test_sun3.py

diff --git a/tests/functional/m68k/meson.build b/tests/functional/m68k/meson.build
index 679faaf86d..601c28d863 100644
--- a/tests/functional/m68k/meson.build
+++ b/tests/functional/m68k/meson.build
@@ -9,5 +9,6 @@ tests_m68k_system_thorough = [
   'nextcube',
   'replay',
   'q800',
+  'sun3',
   'tuxrun',
 ]
diff --git a/tests/functional/m68k/test_sun3.py b/tests/functional/m68k/test_sun3.py
new file mode 100755
index 0000000000..f441184616
--- /dev/null
+++ b/tests/functional/m68k/test_sun3.py
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+#!/usr/bin/env python3
+#
+# Functional test that boots a Sun-3 machine and checks its serial console.
+#
+# Copyright (c) 2026
+#
+
+
+import os
+from qemu_test import QemuSystemTest, Asset
+from qemu_test import wait_for_console_pattern
+
+class Sun3Machine(QemuSystemTest):
+    timeout = 60
+
+    ASSET_PROM = Asset(
+        'https://github.com/54weasels/sun3_60/raw/main/bootprom/boot_1810_01.BIN',
+        '471bf34cc9313814726c2e3506d85a13291603e37b45aaffa71bc1154a2d4851'
+    )
+
+    def test_m68k_sun3_boot(self):
+        self.set_machine('sun3')
+        prom_path = self.ASSET_PROM.fetch()
+
+        # Sun-3 maps TTY A to serial_hd(3)
+        self.vm.set_console(console_index=3)
+        self.vm.add_args('-bios', prom_path)
+        self.vm.launch()
+
+        wait_for_console_pattern(self, '>')
+
+if __name__ == '__main__':
+    QemuSystemTest.main()
diff --git a/tests/functional/qemu_test/asset.py b/tests/functional/qemu_test/asset.py
index 51a434b2b7..eac1e60536 100644
--- a/tests/functional/qemu_test/asset.py
+++ b/tests/functional/qemu_test/asset.py
@@ -223,11 +223,12 @@ def fetch(self):
             raise AssetError(self, "Download retries exceeded", transient=True)
 
         try:
-            # Set these just for informational purposes
-            os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
-                        self.url.encode('utf8'))
-            os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
-                        self.hash.encode('utf8'))
+            if hasattr(os, 'setxattr'):
+                # Set these just for informational purposes
+                os.setxattr(str(tmp_cache_file), "user.qemu-asset-url",
+                            self.url.encode('utf8'))
+                os.setxattr(str(tmp_cache_file), "user.qemu-asset-hash",
+                            self.hash.encode('utf8'))
         except OSError as e:
             self.log.debug("Unable to set xattr on %s: %s", tmp_cache_file, e)
 
-- 
2.50.1 (Apple Git-155)