diff --git a/app/src/test/java/sorting/StudentRecordBookComparator.java b/app/src/test/java/sorting/StudentRecordBookComparator.java
new file mode 100644
index 0000000..22b73e4
--- /dev/null
+++ b/app/src/test/java/sorting/StudentRecordBookComparator.java
@@ -0,0 +1,11 @@
+package sorting;
+
+import java.util.Comparator;
+
+public class StudentRecordBookComparator implements Comparator<Student> {
+
+    @Override
+    public int compare(Student s1, Student s2) {
+        return Integer.compare(s1.getRecordBookNumber(), s2.getRecordBookNumber());
+    }
+}
\ No newline at end of file