refactor: remove code smell java:S5786 (#2159)

https://sonarcloud.io/organizations/iluwatar/rules?open=java%3AS5786&rule_key=java%3AS5786

front-controller/src/test/java/com/iluwatar/front/controller/ApplicationExceptionTest.java

@@ -33,7 +33,7 @@ import org.junit.jupiter.api.Test;
  *
  * @author Jeroen Meulemeester
  */
-public class ApplicationExceptionTest {
+class ApplicationExceptionTest {
 
   @Test
   void testCause() {

front-controller/src/test/java/com/iluwatar/front/controller/CommandTest.java

@@ -38,17 +38,17 @@ import org.junit.jupiter.params.provider.MethodSource;
  *
  * @author Jeroen Meulemeester
  */
-public class CommandTest {
+class CommandTest {
 
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender();
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }
 
@@ -66,7 +66,7 @@ public class CommandTest {
    */
   @ParameterizedTest
   @MethodSource("dataProvider")
-  public void testDisplay(String request, String displayMessage) {
+  void testDisplay(String request, String displayMessage) {
     final var frontController = new FrontController();
     assertEquals(0, appender.getLogSize());
     frontController.handleRequest(request);

front-controller/src/test/java/com/iluwatar/front/controller/FrontControllerTest.java

@@ -38,17 +38,17 @@ import org.junit.jupiter.params.provider.MethodSource;
  *
  * @author Jeroen Meulemeester
  */
-public class FrontControllerTest {
+class FrontControllerTest {
 
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender();
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }
 
@@ -66,7 +66,7 @@ public class FrontControllerTest {
    */
   @ParameterizedTest
   @MethodSource("dataProvider")
-  public void testDisplay(Command command, String displayMessage) {
+  void testDisplay(Command command, String displayMessage) {
     assertEquals(0, appender.getLogSize());
     command.process();
     assertEquals(displayMessage, appender.getLastMessage());

front-controller/src/test/java/com/iluwatar/front/controller/ViewTest.java

@@ -38,17 +38,17 @@ import org.junit.jupiter.params.provider.MethodSource;
  *
  * @author Jeroen Meulemeester
  */
-public class ViewTest {
+class ViewTest {
 
   private InMemoryAppender appender;
 
   @BeforeEach
-  public void setUp() {
+  void setUp() {
     appender = new InMemoryAppender();
   }
 
   @AfterEach
-  public void tearDown() {
+  void tearDown() {
     appender.stop();
   }
 
@@ -66,7 +66,7 @@ public class ViewTest {
    */
   @ParameterizedTest
   @MethodSource("dataProvider")
-  public void testDisplay(View view, String displayMessage) {
+  void testDisplay(View view, String displayMessage) {
     assertEquals(0, appender.getLogSize());
     view.display();
     assertEquals(displayMessage, appender.getLastMessage());