test: deleteCourse method in Course class

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

@@ -6,6 +6,7 @@ import java.io.PrintStream;
 import static org.junit.Assert.assertEquals;
 import java.io.*;
 import java.util.List;
+import static org.junit.jupiter.api.Assertions.*;
 
 /**
  * The CourseTest class contains unit tests for the Course class.
@@ -131,6 +132,45 @@ class CourseTest {
         deleteTempFile();
     }
 
+    @Test
+    public void testDeleteCourse() throws IOException {
+        // Prepare test data
+        Course course1 = new Course("Math", "M101", 3);
+        Course course2 = new Course("Science", "S101", 4);
+        Course course3 = new Course("Java", "J101", 4);
+
+        // Write courses to the test file
+        PrintWriter writer = new PrintWriter(new FileWriter(TEMP_FILE));
+        writer.println(course1.getCourseName());
+        writer.println(course1.getCourseCode());
+        writer.println(course1.getCourseCredit());
+        writer.println(course2.getCourseName());
+        writer.println(course2.getCourseCode());
+        writer.println(course2.getCourseCredit());
+        writer.println(course3.getCourseName());
+        writer.println(course3.getCourseCode());
+        writer.println(course3.getCourseCredit());
+        writer.close();
+
+        // Simulate user input for course deletion
+        ByteArrayInputStream inputStream = new ByteArrayInputStream("1\n0".getBytes());
+        System.setIn(inputStream);
+
+        // Delete a course
+        Course.deleteCourse(TEMP_FILE);
+
+        // Read courses after deletion
+        List<Course> coursesAfterDeletion = Course.readFromFile(TEMP_FILE);
+
+        // Ensure the correct number of courses remaining after deletion
+        assertEquals(2, coursesAfterDeletion.size());
+
+        // Check if the correct course was deleted
+        assertFalse(coursesAfterDeletion.contains(course1));
+
+        deleteTempFile();
+    }
+
 
     /**
      * Creates a temporary file with the provided data.