This test case demonstrates how to force libvirt to use the
uefi-vars device for an x86_64 guest, despite that not being the
default firmware build for the architecture at this point in
time.

It currently fails because the QEMU driver does not yet allow
the use of JSON for NVRAM. That will change in a future commit.

In addition to the latest version, the test case is also executed
against QEMU 8.2.0 specifically. This version of the test case is
intended to fail, because the uefi-vars device was not yet
available in that version of QEMU. The exact error message will
change down the line.

Signed-off-by: Andrea Bolognani <abologna@redhat.com>
---
 ...uto-efi-format-nvram-json.x86_64-8.2.0.err |  1 +
 ...uto-efi-format-nvram-json.x86_64-8.2.0.xml | 35 +++++++++++++++++++
 ...to-efi-format-nvram-json.x86_64-latest.err |  1 +
 ...to-efi-format-nvram-json.x86_64-latest.xml | 35 +++++++++++++++++++
 .../firmware-auto-efi-format-nvram-json.xml   | 18 ++++++++++
 tests/qemuxmlconftest.c                       |  2 ++
 6 files changed, 92 insertions(+)
 create mode 100644 tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.err
 create mode 100644 tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.xml
 create mode 100644 tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.err
 create mode 100644 tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.xml
 create mode 100644 tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.xml

diff --git a/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.err b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.err
new file mode 100644
index 0000000000..e5f67f8d09
--- /dev/null
+++ b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.err
@@ -0,0 +1 @@
+unsupported configuration: Unsupported nvram format 'json'
diff --git a/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.xml b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.xml
new file mode 100644
index 0000000000..cc7fdfad79
--- /dev/null
+++ b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-8.2.0.xml
@@ -0,0 +1,35 @@
+<domain type='kvm'>
+  <name>guest</name>
+  <uuid>63840878-0deb-4095-97e6-fc444d9bc9fa</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os firmware='efi'>
+    <type arch='x86_64' machine='pc-q35-8.2'>hvm</type>
+    <nvram format='json'/>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <acpi/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu64</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <controller type='usb' index='0' model='none'/>
+    <controller type='sata' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
+    </controller>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <audio id='1' type='none'/>
+    <watchdog model='itco' action='reset'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.err b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.err
new file mode 100644
index 0000000000..e5f67f8d09
--- /dev/null
+++ b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.err
@@ -0,0 +1 @@
+unsupported configuration: Unsupported nvram format 'json'
diff --git a/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.xml b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.xml
new file mode 100644
index 0000000000..cc7fdfad79
--- /dev/null
+++ b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.x86_64-latest.xml
@@ -0,0 +1,35 @@
+<domain type='kvm'>
+  <name>guest</name>
+  <uuid>63840878-0deb-4095-97e6-fc444d9bc9fa</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <currentMemory unit='KiB'>1048576</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os firmware='efi'>
+    <type arch='x86_64' machine='pc-q35-8.2'>hvm</type>
+    <nvram format='json'/>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <acpi/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu64</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <controller type='usb' index='0' model='none'/>
+    <controller type='sata' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x1f' function='0x2'/>
+    </controller>
+    <controller type='pci' index='0' model='pcie-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <audio id='1' type='none'/>
+    <watchdog model='itco' action='reset'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.xml b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.xml
new file mode 100644
index 0000000000..8c7a268910
--- /dev/null
+++ b/tests/qemuxmlconfdata/firmware-auto-efi-format-nvram-json.xml
@@ -0,0 +1,18 @@
+<domain type='kvm'>
+  <name>guest</name>
+  <uuid>63840878-0deb-4095-97e6-fc444d9bc9fa</uuid>
+  <memory unit='KiB'>1048576</memory>
+  <vcpu placement='static'>1</vcpu>
+  <os firmware='efi'>
+    <type arch='x86_64' machine='pc-q35-8.2'>hvm</type>
+    <nvram format='json'/>
+  </os>
+  <features>
+    <acpi/>
+  </features>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <controller type='usb' model='none'/>
+    <memballoon model='none'/>
+  </devices>
+</domain>
diff --git a/tests/qemuxmlconftest.c b/tests/qemuxmlconftest.c
index 85c35af515..a109ae99d6 100644
--- a/tests/qemuxmlconftest.c
+++ b/tests/qemuxmlconftest.c
@@ -1630,6 +1630,8 @@ mymain(void)
     DO_TEST_CAPS_LATEST("firmware-auto-efi-format-nvramtemplate-qcow2");
     DO_TEST_CAPS_LATEST("firmware-auto-efi-format-mismatch");
     DO_TEST_CAPS_LATEST_FAILURE("firmware-auto-efi-format-mismatch-nvramtemplate");
+    DO_TEST_CAPS_LATEST_FAILURE("firmware-auto-efi-format-nvram-json");
+    DO_TEST_CAPS_VER_FAILURE("firmware-auto-efi-format-nvram-json", "8.2.0");
 
     /* This test passes, but the outcome is not the desired one: the
      * generic edk2 build gets selected instead of the AMD SEV one */
-- 
2.52.0