[skip ci] Fix Test for usage with processTestAot & refactor/linting

src/test/java/com/ModeratorElection/MainViewTest.java

@@ -5,12 +5,13 @@ import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 import org.springframework.boot.test.context.SpringBootTest;
 
-@SpringBootTest
+@SpringBootTest(classes = MainView.class)
 public class MainViewTest {
     @Test
     void mainViewConstructor() {
         MainView sut = new MainView("Harry,Sven,Ida");
         CheckboxGroup cgroupTest = (CheckboxGroup) sut.getChildren().filter(child -> child instanceof CheckboxGroup).findAny().orElse(null);
+        assert cgroupTest != null;
         int  cgroupTestSelectedItemsSize = cgroupTest.getSelectedItems().size();
         Assertions.assertEquals(3,cgroupTestSelectedItemsSize);
     }