Return !0 when qt tests fail.

src/qt/test/test_main.cpp

@@ -6,6 +6,11 @@
 // This is all you need to run all the tests
 int main(int argc, char *argv[])
 {
+    bool fInvalid = false;
+
     URITests test1;
-    QTest::qExec(&test1);
+    if (QTest::qExec(&test1) != 0)
+        fInvalid = true;
+
+    return fInvalid;
 }