Fix signal tests

Tests worked only if ran separately because CoreApplication was new'd
for each test but never deleted. This fired an assert that assures that
there's only one CoreApplication existing at a time

tests/auto/utils/signal/tst_signal.cpp

@@ -15,18 +15,18 @@ TEST_SUITE("Signal")
     {
         int val = 4;
 
-        auto *appInstance = new KDFoundation::CoreApplication;
+        KDFoundation::CoreApplication app;
         KDBindings::Signal<int> signal1;
         KDBindings::Signal<int> signal2;
 
         std::thread thread1([&] {
-            signal1.connectDeferred(appInstance->connectionEvaluator(), [&val](int value) {
+            signal1.connectDeferred(app.connectionEvaluator(), [&val](int value) {
                 val += value;
             });
         });
 
         std::thread thread2([&] {
-            signal2.connectDeferred(appInstance->connectionEvaluator(), [&val](int value) {
+            signal2.connectDeferred(app.connectionEvaluator(), [&val](int value) {
                 val += value;
             });
         });
@@ -38,25 +38,25 @@ TEST_SUITE("Signal")
         signal2.emit(3);
         CHECK(val == 4); // val not changing immediately after emit
 
-        appInstance->connectionEvaluator()->evaluateDeferredConnections();
+        app.connectionEvaluator()->evaluateDeferredConnections();
 
         CHECK(val == 9);
     }
 
     TEST_CASE("Emit Multiple Signals with Evaluator")
     {
-        auto *appInstance = new KDFoundation::CoreApplication;
+        KDFoundation::CoreApplication app;
         KDBindings::Signal<int> signal1;
         KDBindings::Signal<int> signal2;
 
         int val1 = 4;
         int val2 = 4;
 
-        signal1.connectDeferred(appInstance->connectionEvaluator(), [&val1](int value) {
+        signal1.connectDeferred(app.connectionEvaluator(), [&val1](int value) {
             val1 += value;
         });
 
-        signal2.connectDeferred(appInstance->connectionEvaluator(), [&val2](int value) {
+        signal2.connectDeferred(app.connectionEvaluator(), [&val2](int value) {
             val2 += value;
         });
 
@@ -74,19 +74,19 @@ TEST_SUITE("Signal")
         CHECK(val1 == 4);
         CHECK(val2 == 4);
 
-        appInstance->connectionEvaluator()->evaluateDeferredConnections();
+        app.connectionEvaluator()->evaluateDeferredConnections();
 
         CHECK(val1 == 6);
         CHECK(val2 == 7);
     }
 
     TEST_CASE("Connect, Emit, Disconnect, and Evaluate")
     {
-        auto *appInstance = new KDFoundation::CoreApplication;
+        KDFoundation::CoreApplication app;
         KDBindings::Signal<int> signal;
         int val = 4;
 
-        auto connection = signal.connectDeferred(appInstance->connectionEvaluator(), [&val](int value) {
+        auto connection = signal.connectDeferred(app.connectionEvaluator(), [&val](int value) {
             val += value;
         });
 
@@ -97,7 +97,7 @@ TEST_SUITE("Signal")
 
         connection.disconnect();
 
-        appInstance->connectionEvaluator()->evaluateDeferredConnections();
+        app.connectionEvaluator()->evaluateDeferredConnections();
 
         CHECK(val == 4);
     }