tests: qemuxml2xml: Wire up QEMUCaps usage

Future changes will make some of these tests dependent on specific
QEMUCaps flags, so wire up the basic handling. Flags will be added
in future patches.

tests/qemuxml2xmltest.c

@@ -32,6 +32,8 @@ struct testInfo {
     char *inName;
     char *outActiveName;
     char *outInactiveName;
+
+    virQEMUCapsPtr qemuCaps;
 };
 
 static int
@@ -171,6 +173,8 @@ testInfoFree(struct testInfo *info)
     VIR_FREE(info->inName);
     VIR_FREE(info->outActiveName);
     VIR_FREE(info->outInactiveName);
+
+    virObjectUnref(info->qemuCaps);
 }
 
 
@@ -180,6 +184,13 @@ testInfoSet(struct testInfo *info,
             bool different,
             int when)
 {
+    if (!(info->qemuCaps = virQEMUCapsNew()))
+        goto error;
+
+    if (qemuTestCapsCacheInsert(driver.qemuCapsCache, name,
+                                info->qemuCaps) < 0)
+        goto error;
+
     if (virAsprintf(&info->inName, "%s/qemuxml2argvdata/qemuxml2argv-%s.xml",
                     abs_srcdir, name) < 0)
         goto error;