documentation: isNumber and rightPrefix test Methods

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

@@ -25,21 +25,21 @@ class AdministrationTest {
     void isNumber() {
 
         Administration administration = new Administration();
-        String full01 = "S1002";
-        String str1 = full01.substring(1);
-        String full02 = "S100Z";
-        String str2 = full02.substring(1);
-        String full03 = "P1004";
-        String str3 = full03.substring(1);
-
-
+        String full01 = "S1002"; //Supposed student id
+        String str1 = full01.substring(1); //String without the Letter
+        String full02 = "S100Z"; //Supposed student id
+        String str2 = full02.substring(1); //String without the Letter
+        String full03 = "P1004"; //Supposed professor id
+        String str3 = full03.substring(1); //String without the Letter
+
+        //checks if the substrings contain only digits
         boolean test01 = administration.isNumber(str1);
         boolean test02 = administration.isNumber(str2);
         boolean test03 = administration.isNumber(str3);
 
-        assertEquals(true, test01);
-        assertEquals(false, test02);
-        assertEquals(true, test03);
+        assertEquals(true, test01); //only digits besides the first letter
+        assertEquals(false, test02); // false, because the Z at the end
+        assertEquals(true, test03); //only digits besides the first letter
 
     }
 
@@ -47,14 +47,14 @@ class AdministrationTest {
     void rightPrefix() {
         Administration administration = new Administration();
 
-        String full01 = "S1002";
-        String full02 = "s100Z";
-        String full03 = "X1004";
+        String full01 = "S1002"; //Supposed Student id
+        String full02 = "s100Z"; //Supposed Student id
+        String full03 = "X1004"; // Supposed Professor id
 
 
-        boolean test01 = administration.rightPrefix(full01, 1);
-        boolean test02 = administration.rightPrefix(full02, 1);
-        boolean test03 = administration.rightPrefix(full03, 3);
+        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
 
         assertEquals(true, test01);
         assertEquals(false, test02);