diff --git a/test_student.c b/test_student.c
new file mode 100644
index 00000000..467d4264
--- /dev/null
+++ b/test_student.c
@@ -0,0 +1,31 @@
+// test_student.c
+
+#include "unity.h"
+#include "student.h"  // Your original code's header file
+
+void setUp(void) {
+    // Code to run before each test
+}
+
+void tearDown(void) {
+    // Code to run after each test
+}
+
+void test_calculate_percentage_all_same_marks(void) {
+    struct student s = {"John", {80, 80, 80, 80, 80}, 0.0};
+    calculate_percentage(&s);
+    TEST_ASSERT_EQUAL_FLOAT(80.0, s.percentage);
+}
+
+void test_calculate_percentage_different_marks(void) {
+    struct student s = {"Alice", {90, 80, 85, 70, 75}, 0.0};
+    calculate_percentage(&s);
+    TEST_ASSERT_EQUAL_FLOAT(80.0, s.percentage);
+}
+
+int main(void) {
+    UNITY_BEGIN();
+    RUN_TEST(test_calculate_percentage_all_same_marks);
+    RUN_TEST(test_calculate_percentage_different_marks);
+    return UNITY_END();
+}