Renaming Refactor

In this merge request, the following changes are committed:

• The mocked objects in tests are renamed to portray that they are indeed mocked
• The is* methods of repositories are renamed to "exists" method

src/main/java/nl/tudelft/ewi/tam/repositories/CourseEditionRepository.java

@@ -184,7 +184,7 @@ public class CourseEditionRepository {
      * @param courseId  the id of the course to look for
      * @return          whether a course with the given id exists
      */
-    public boolean isCourse(final int courseId) {
+    public boolean exists(final int courseId) {
         final Object[] arguments = {courseId };
         final int[] argumentTypes = {Types.INTEGER };
         return jdbcDaoImpl.count(GET_COURSE_ID, arguments, argumentTypes) > 0;
@@ -196,7 +196,7 @@ public class CourseEditionRepository {
      * @param courseCode    the course code to look for
      * @return              whether there is a course with the given course code
      */
-    public boolean isCourse(final String courseCode) {
+    public boolean exists(final String courseCode) {
         final Object[] arguments = {courseCode };
         final int[] argumentTypes = {Types.VARCHAR };
         return jdbcDaoImpl.count(GET_COURSE_CODE, arguments, argumentTypes) > 0;