diff --git a/src/__init__.py b/src/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/moduleA.py b/src/moduleA.py
new file mode 100644
index 0000000..b7f0906
--- /dev/null
+++ b/src/moduleA.py
@@ -0,0 +1,10 @@
+def addition(a=1, b=2):
+    return a + b
+
+
+def f(x: int, y: int) -> int:
+    return x + y
+
+
+if __name__ == "__main__":
+    print(addition(5, 5))
diff --git a/tests/test_moduleA.py b/tests/test_moduleA.py
new file mode 100644
index 0000000..42fe6cc
--- /dev/null
+++ b/tests/test_moduleA.py
@@ -0,0 +1,6 @@
+from src.moduleA import addition
+
+
+def test_a():
+    assert addition() == 3
+    assert addition(5, 5) == 10