test: readFromFile method in Course class

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

@@ -1,7 +1,5 @@
 package org.example;
-
 import org.junit.jupiter.api.Test;
-
 import static org.junit.jupiter.api.Assertions.*;
 import java.io.ByteArrayOutputStream;
 import java.io.PrintStream;
@@ -70,6 +68,43 @@ class CourseTest {
         if (file.exists()) {
             file.delete();
         }
+    }
+
+    @Test
+    void readFromFile() {
+        // Create a temporary file with sample course data
+        String filename = "test_course_data.txt";
+        try (PrintWriter writer = new PrintWriter(new FileWriter(filename))) {
+            writer.println("Math");
+            writer.println("C101");
+            writer.println(3);
+            writer.println("Science");
+            writer.println("C201");
+            writer.println(4);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+
+        // Read course data from the temporary file
+        List<Course> courses = Course.readFromFile(filename);
+
+        // Assert that the read data matches the original course data
+        assertEquals(2, courses.size());
+
+        Course course1 = courses.get(0);
+        assertEquals("Math", course1.getCourseName());
+        assertEquals("C101", course1.getCourseCode());
+        assertEquals(3, course1.getCourseCredit());
 
+        Course course2 = courses.get(1);
+        assertEquals("Science", course2.getCourseName());
+        assertEquals("C201", course2.getCourseCode());
+        assertEquals(4, course2.getCourseCredit());
+
+        // Delete the temporary file
+        File file = new File(filename);
+        if (file.exists()) {
+            file.delete();
+        }
     }
 }