refactoring: adjusting Test functions to the naming convention agreed on

src/test/java/org/example/CourseTest.java

@@ -24,7 +24,7 @@ class CourseTest {
      * Verifies that the method correctly prints course information to the console.
      */
     @Test
-    void printCourseInfo() {
+    void testPrintCourseInfo() {
         // Set up the expected output
         String expectedCourseName = "Course Name: Math";
         String expectedCourseCode = "Course Code: M101";
@@ -58,7 +58,7 @@ class CourseTest {
      * Verifies that course data is correctly written to a file and can be read back.
      */
     @Test
-    void writeToFile() {
+    void testWriteToFile() {
         // Create a new course
         Course course = sampleCourse;
 
@@ -84,7 +84,7 @@ class CourseTest {
      * Verifies that course data can be correctly read from a file.
      */
     @Test
-    void readFromFile() {
+    void testReadFromFile() {
         // Create a temporary file with sample course data
         createTempFile("Math", "C101", "3", "Science", "C201", "4");
 
@@ -109,7 +109,7 @@ class CourseTest {
     }
 
     @Test
-    void addCourse() {
+    void testAddCourse() {
         // Create a new course
         String courseName = sampleCourse.getCourseName();
         String courseCode = sampleCourse.getCourseID();