Autotest: test both libdbus-1 load failure and connection failure

Change-Id: I39cc61d0d59846ab8c23ffff14242294649c1a45
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>

tests/auto/dbus/dbus.pro

@@ -10,6 +10,7 @@ SUBDIRS+=\
            qdbusconnection \
            qdbusconnection_no_app \
            qdbusconnection_no_bus \
+           qdbusconnection_no_libdbus \
            qdbuscontext \
            qdbusinterface \
            qdbuslocalcalls \

tests/auto/dbus/qdbusconnection_no_bus/tst_qdbusconnection_no_bus.cpp

@@ -52,7 +52,9 @@ public:
     tst_QDBusConnectionNoBus()
     {
         qputenv("DBUS_SESSION_BUS_ADDRESS", "unix:abstract=/tmp/does_not_exist");
+#ifdef SIMULATE_LOAD_FAIL
         qputenv("QT_SIMULATE_DBUS_LIBFAIL", "1");
+#endif
     }
 
 private slots:
@@ -67,7 +69,7 @@ void tst_QDBusConnectionNoBus::connectToBus()
 
     QDBusConnection con = QDBusConnection::sessionBus();
 
-    QVERIFY(true); // if we didn't crash here, the test passed :)
+    QVERIFY(!con.isConnected()); // if we didn't crash here, the test passed :)
 }
 
 QTEST_APPLESS_MAIN(tst_QDBusConnectionNoBus)

tests/auto/dbus/qdbusconnection_no_libdbus/qdbusconnection_no_libdbus.pro

@@ -0,0 +1,5 @@
+CONFIG += testcase parallel_test
+TARGET = tst_qdbusconnection_no_libdbus
+QT = core dbus testlib
+DEFINES += SIMULATE_LOAD_FAIL
+SOURCES += ../qdbusconnection_no_bus/tst_qdbusconnection_no_bus.cpp