Added Test to writeToFile Method from Admin Class

src/test/java/org/example/AdminTest.java

@@ -1,7 +1,12 @@
 package org.example;
 
+import org.junit.jupiter.api.Test;
+
 import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.PrintStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
 
 import static org.junit.jupiter.api.Assertions.*;
 
@@ -22,5 +27,23 @@ class AdminTest {
         assertTrue(printedOutput.contains("A1001"));
         assertTrue(printedOutput.contains("Admin"));
 
+    }
+
+    @Test
+    void writeToFile() throws IOException {
+        Admin admin = new Admin("Simon", "A1001", "Admin") ;
+
+        String filename = "testAdminData.txt";
+
+        admin.writeToFile(admin, filename);
+
+        String content = Files.readString(Path.of(filename));
+        assertEquals("Simon\nA1001\nAdmin", content);
+
+        Files.delete(Path.of(filename));
+
+
+
+
     }
 }