Test: added testStudentFails()

src/test/java/org/example/StudentTest.java

@@ -146,4 +146,14 @@ class StudentTest {
         assertTrue(student.hasPassed(), "Student should have passed.");
     }
 
+    @Test
+    void testStudentFails() {
+        Student student = new Student("Jane Doe", "S1002", "Student");
+        Course history = new Course("History", "C103", 5); // Assuming 5 credits
+        Course biology = new Course("Biology", "C104", 5); // Assuming 5 credits
+        student.assignGrade(history, "8"); // Assuming grade is a String. Adjust if it's numeric.
+        student.assignGrade(biology, "9");
+
+        assertFalse(student.hasPassed(), "Student should have failed.");
+    }
 }