tests: add a function for checking exclusive flags

We can reject some non-sensical combinations with an error
message, once we add flags for them.
Signed-off-by: NJán Tomko <jtomko@redhat.com>

tests/qemuxml2argvtest.c

@@ -465,6 +465,18 @@ testCompareXMLToStartupXML(const void *data)
 }
 
 
+static int
+testCheckExclusiveFlags(int flags)
+{
+    virCheckFlags(FLAG_EXPECT_FAILURE |
+                  FLAG_EXPECT_PARSE_ERROR |
+                  FLAG_FIPS |
+                  0, -1);
+
+    return 0;
+}
+
+
 static int
 testCompareXMLToArgv(const void *data)
 {
@@ -507,6 +519,9 @@ testCompareXMLToArgv(const void *data)
     if (virQEMUCapsGet(info->qemuCaps, QEMU_CAPS_ENABLE_FIPS))
         flags |= FLAG_FIPS;
 
+    if (testCheckExclusiveFlags(info->flags) < 0)
+        goto cleanup;
+
     if (qemuTestCapsCacheInsert(driver.qemuCapsCache, info->qemuCaps) < 0)
         goto cleanup;