Corrected files in order to pass checkstyle for tests

src/test/java/TestMyClass.java

+import static org.assertj.core.api.Assertions.assertThat;
+
 import org.junit.jupiter.api.Test;
-import static org.assertj.core.api.Assertions.*;
 
+/**
+ * A template class for testing with assertJ.
+ */
 public class TestMyClass {
 
   @Test