diff --git a/testing/local_testing/add_function.py b/testing/local_testing/add_function.py
new file mode 100644
index 000000000..40bd7ec64
--- /dev/null
+++ b/testing/local_testing/add_function.py
@@ -0,0 +1,3 @@
+def add(a, b):
+    return a + b
+
diff --git a/testing/local_testing/local_test_0.py b/testing/local_testing/local_test_0.py
new file mode 100644
index 000000000..95dbd553c
--- /dev/null
+++ b/testing/local_testing/local_test_0.py
@@ -0,0 +1,16 @@
+import pytest
+
+@pytest.mark.parametrize("arg1, arg2", [(1, 1)])
+def test_parametrization(arg1, arg2):
+    assert arg1 == arg2
+    assert arg1 + 1 == arg2 + 1
+
+
+# Gets the error: In test_parametrization: indirect fixture '(1, 1)' doesn't exist
+# Goal is to change this message into a more beginner friendly message. 
+    
+# The error message lives in this path: pytest/src/_pytest/python.py
+    
+
+
+#("arg1", "arg2"), and "arg1, arg2" works, but cannot put in default parameters as normal function
\ No newline at end of file
diff --git a/testing/local_testing/local_test_test.py b/testing/local_testing/local_test_test.py
new file mode 100644
index 000000000..a677697bf
--- /dev/null
+++ b/testing/local_testing/local_test_test.py
@@ -0,0 +1,22 @@
+# test_math_operations.py
+
+import pytest
+import add_function
+
+
+result_index = [
+    (1, 2, 3),
+    (-1, 1, 0),
+    (0, 0, 0),
+    (5, -3, 2),
+    (1, 1, 2)
+]
+
+@pytest.mark.parametrize("a, b, expected_result", result_index)
+
+
+def test_add(a, b, expected_result):
+    assert add_function.add(a, b) == expected_result
+
+
+