refactoring: extracting admin object in AdministrationTest file

src/test/java/org/example/AdministrationTest.java

@@ -6,17 +6,17 @@ import static org.junit.jupiter.api.Assertions.*;
 
 class AdministrationTest {
 
+    Administration admin = new Administration();
     private static final Course sampleCourse = new Course("Math", "M101", 4);
 
     // Test the findProfessorById Method
     @Test
     void findProfessorById() {
-        Administration administration = new Administration();
         Professor prof1 = new Professor("P1001", "Aaron", "Professor");
 
-        administration.addProfessor(prof1);
+        admin.addProfessor(prof1);
 
-        Professor foundProf1 = administration.findProfessorById("P1001");
+        Professor foundProf1 = admin.findProfessorById("P1001");
         assertEquals(prof1, foundProf1);
 
 
@@ -26,7 +26,6 @@ class AdministrationTest {
     @Test
     void isNumber() {
 
-        Administration administration = new Administration();
         String full01 = "S1002"; //Supposed student id
         // String str1 = full01.substring(1); //String without the Letter
         String full02 = "S100Z"; //Supposed student id
@@ -35,9 +34,9 @@ class AdministrationTest {
         // String str3 = full03.substring(1); //String without the Letter
 
         //checks if the substrings contain only digits
-        boolean test01 = administration.isNumber(full01);
-        boolean test02 = administration.isNumber(full02);
-        boolean test03 = administration.isNumber(full03);
+        boolean test01 = admin.isNumber(full01);
+        boolean test02 = admin.isNumber(full02);
+        boolean test03 = admin.isNumber(full03);
 
         assertEquals(true, test01); //only digits besides the first letter
         assertEquals(false, test02); // false, because the Z at the end
@@ -47,16 +46,15 @@ class AdministrationTest {
 
     @Test
     void rightPrefix() {
-        Administration administration = new Administration();
 
         String full01 = "S1002"; //Supposed Student id
         String full02 = "s100Z"; //Supposed Student id
         String full03 = "X1004"; // Supposed Professor id
 
 
-        boolean test01 = administration.rightPrefix(full01, 1); //checks if the id is correct,  "1" because we are expecting a student id
-        boolean test02 = administration.rightPrefix(full02, 1); //checks if the id is correct, "1" because we are expecting a student id
-        boolean test03 = administration.rightPrefix(full03, 3); //checks if the id is correct, "3" because we are expecting a professor id
+        boolean test01 = admin.rightPrefix(full01, 1); //checks if the id is correct,  "1" because we are expecting a student id
+        boolean test02 = admin.rightPrefix(full02, 1); //checks if the id is correct, "1" because we are expecting a student id
+        boolean test03 = admin.rightPrefix(full03, 3); //checks if the id is correct, "3" because we are expecting a professor id
 
         assertEquals(true, test01);
         assertEquals(false, test02);
@@ -65,12 +63,11 @@ class AdministrationTest {
 @org.junit.jupiter.api.Test
 
     void findStudentById(){
-        Administration administration = new Administration();
         Student student = new Student("Mark", "S1001", "Student");
 
-        administration.addStudents(student);
+        admin.addStudents(student);
 
-        Student student2 = administration.findStudentById("S1001");
+        Student student2 = admin.findStudentById("S1001");
         assertEquals(student, student2);
     }
 
@@ -80,7 +77,6 @@ class AdministrationTest {
      */
     @Test
     void addCourse() {
-        Administration admin = new Administration();
         Course course = sampleCourse;
         admin.addCourse(course);
         assertEquals(course, admin.findCourseByID("M101"));
@@ -92,16 +88,15 @@ class AdministrationTest {
      */
     @Test
     public void testDeleteCourse() {
-        Administration administration = new Administration();
         // Adding a course
         Course course = sampleCourse;
-        administration.addCourse(course);
+        admin.addCourse(course);
 
         // Deleting the course
-        assertTrue(administration.deleteCourse("M101"));
+        assertTrue(admin.deleteCourse("M101"));
 
         // Checking if the course is no longer found
-        assertNull(administration.findCourseByID("M101"));
+        assertNull(admin.findCourseByID("M101"));
     }
 
     /**
@@ -110,13 +105,12 @@ class AdministrationTest {
      */
     @Test
     public void testFindCourseByID() {
-        Administration administration = new Administration();
         // Adding a course
         Course course = sampleCourse;
-        administration.addCourse(course);
+        admin.addCourse(course);
 
         // Finding the added course
-        assertEquals(course, administration.findCourseByID("M101"));
+        assertEquals(course, admin.findCourseByID("M101"));
     }
 
 }