tests/qgraph: add generic PCI testcases

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

tests/Makefile.include

@@ -760,6 +760,7 @@ qos-test-obj-y += tests/libqos/arm-xilinx-zynq-a9-machine.o
 qos-test-obj-y += tests/libqos/x86_64_pc-machine.o
 
 # Tests
+qos-test-obj-y += tests/pci-test.o
 qos-test-obj-y += tests/sdhci-test.o
 
 check-unit-y += tests/test-qgraph$(EXESUF)

tests/pci-test.c

@@ -0,0 +1,25 @@
+/*
+ * QTest testcase for PCI
+ *
+ * Copyright (c) 2018 Red Hat, Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+#include "libqos/qgraph.h"
+#include "libqos/pci.h"
+
+/* Tests only initialization so far. TODO: Replace with functional tests */
+static void nop(void *obj, void *data, QGuestAllocator *alloc)
+{
+}
+
+static void register_pci_test(void)
+{
+    qos_add_test("nop", "pci-device", nop, NULL);
+}
+
+libqos_init(register_pci_test);