DPL GUI: increase code coverage

Author: ktf

Framework/Core/test/test_GUITests.cxx

@@ -148,7 +148,10 @@ BOOST_AUTO_TEST_CASE(DevicesGraph)
       {},
       {},
       {},
-      {},
+      { ConfigParamSpec{ "global-config", VariantType::String, { "A global config option for all processor specs" } },
+        ConfigParamSpec{ "a-boolean", VariantType::Bool, true, { "A boolean which we pick by default" } },
+        ConfigParamSpec{ "an-int", VariantType::Int, 10, { "An int for which we pick up the default" } },
+        ConfigParamSpec{ "a-double", VariantType::Double, 11., { "A double for which we pick up the override" } } },
       AlgorithmSpec{},
       {},
       {},