diff --git a/src/functions/calculate_square.py b/src/functions/calculate_square.py
new file mode 100644
index 00000000..fefba796
--- /dev/null
+++ b/src/functions/calculate_square.py
@@ -0,0 +1,11 @@
+def calculate_square(number):
+    square= number*number
+    return square
+# Test Case:
+def test_calculate_square():
+    assert calculate_square(0)==0
+    assert calculate_square(1)==1
+    assert calculate_square(2)==4
+    print("All test cases passed")
+
+test_calculate_square()
\ No newline at end of file