Fixed most reported issues by SonarCloud.

leader-followers/src/test/java/com/AppTest.java

@@ -21,10 +21,13 @@
  * THE SOFTWARE.
  */
 
-package com.iluwatar.leaderfollowers;
+package com;
 
+import com.iluwatar.leaderfollowers.App;
 import org.junit.Test;
 
+import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
+
 /**
  *
  * Application test
@@ -33,9 +36,8 @@ import org.junit.Test;
 public class AppTest {
 
     @Test
-    public void test() throws InterruptedException {
-        String[] args = {};
-        App.main(args);
+    public void shouldExecuteApplicationWithoutException() {
+        assertDoesNotThrow(() -> App.main(new String[]{}));
     }
 
 }

leader-followers/src/test/java/com/TaskHandlerTest.java

@@ -21,8 +21,10 @@
  * THE SOFTWARE.
  */
 
-package com.iluwatar.leaderfollowers;
+package com;
 
+import com.iluwatar.leaderfollowers.Task;
+import com.iluwatar.leaderfollowers.TaskHandler;
 import org.junit.Assert;
 import org.junit.Test;
 

leader-followers/src/test/java/com/TaskSetTest.java

@@ -21,8 +21,10 @@
  * THE SOFTWARE.
  */
 
-package com.iluwatar.leaderfollowers;
+package com;
 
+import com.iluwatar.leaderfollowers.Task;
+import com.iluwatar.leaderfollowers.TaskSet;
 import org.junit.Assert;
 import org.junit.Test;
 

leader-followers/src/test/java/com/WorkCenterTest.java

@@ -21,8 +21,11 @@
  * THE SOFTWARE.
  */
 
-package com.iluwatar.leaderfollowers;
+package com;
 
+import com.iluwatar.leaderfollowers.TaskHandler;
+import com.iluwatar.leaderfollowers.TaskSet;
+import com.iluwatar.leaderfollowers.WorkCenter;
 import org.junit.Assert;
 import org.junit.Test;