First review changes++

First review changes++

data-mapper/src/test/java/com/iluwatar/datamapper/DataMapperTest.java

@@ -24,8 +24,7 @@ import org.junit.Test;
 
 import com.iluwatar.datamapper.Student;
 import com.iluwatar.datamapper.StudentDataMapper;
-import com.iluwatar.datamapper.StudentFirstDataMapper;
-import com.iluwatar.datamapper.StudentSecondDataMapper;
+import com.iluwatar.datamapper.StudentDataMapperImpl;
 
 /**
  * The Data Mapper (DM) is a layer of software that separates the in-memory objects from the
@@ -45,41 +44,7 @@ public class DataMapperTest {
   public void testFirstDataMapper() {
 
     /* Create new data mapper of first type */
-    final StudentDataMapper mapper = new StudentFirstDataMapper();
-
-    /* Create new student */
-    Student student = new Student(1, "Adam", 'A');
-
-    /* Add student in respectibe db */
-    mapper.insert(student);
-
-    /* Check if student is added in db */
-    assertEquals(student.getStudentId(), mapper.find(student.getStudentId()).get().getStudentId());
-
-    /* Update existing student object */
-    student = new Student(student.getStudentId(), "AdamUpdated", 'A');
-
-    /* Update student in respectibe db */
-    mapper.update(student);
-
-    /* Check if student is updated in db */
-    assertEquals(mapper.find(student.getStudentId()).get().getName(), "AdamUpdated");
-
-    /* Delete student in db */
-    mapper.delete(student);
-
-    /* Result should be false */
-    assertEquals(false, mapper.find(student.getStudentId()).isPresent());
-  }
-
-  /**
-   * This test verify that second data mapper is able to perform all CRUD operations on Student
-   */
-  @Test
-  public void testSecondDataMapper() {
-
-    /* Create new data mapper of second type */
-    final StudentDataMapper mapper = new StudentSecondDataMapper();
+    final StudentDataMapper mapper = new StudentDataMapperImpl();
 
     /* Create new student */
     Student student = new Student(1, "Adam", 'A');