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+# [Copilot examples](../README.md) › [Unit testing with Copilot](README.md) (Python)
+
+In this example we write simple function using Copilot and then let it create mock data and unittests for us, thus giving complete control over our code to the Copilot.
+
+
+## Setup:
+
+Requires Python (>3.8) and unittest library.
+
+## Steps:
+
+- Create a new file called `your_func_name.py`
+
+- Type `#function that delets number from array` on line 1 then on the next line start writing `def your_function_name` and press <kbd>Tab</kbd> to let Copilot complete your code. 
+- You can also use <kbd>Ctrl</kbd> + <kbd>Enter</kbd> to view other suggestions
+
+- Accept the following solution(example function `delete_numbers`):
+
+  ```python
+    def delete_numbers(numbers, number):
+        for i in range(len(numbers)):
+            if numbers[i] == number:
+                del numbers[i]
+        return numbers
+  ```
+
+- Type `#unit test for function delete_numbers`, go on to the next line and use <kbd>Tab</kbd> to allow Copilot complete code with the suggestions.
+It should suggest mock data, like the following:
+
+  ```python
+    test_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+    test_number = 5
+  ```
+
+- Go onto the next line and import `unittest`- this will hint Copilot you want to use `unittest` library for testing. On the next line start typing `class` and let Copilot autocomplete your code with proper unit test and assertions:
+
+  ```python
+    import unittest
+    class TestDeleteNumbers(unittest.TestCase):
+        def test_delete_numbers(self):
+            self.assertEqual(delete_numbers(test_list, test_number), [1, 2, 3, 4, 6, 7, 8, 9, 10])
+  ```
+
+And you are done! You let copilot suggest and autocomplete code. It wrote a function you wanted and then you hinted it that you want to use `unittest` library for creating unittest. It provided you with data and even auto created a correct assertion. Amazing! Now creating simple functions and simple unit tests should be a breeze. You can see full file that was created by Github Copilot in the repo.
+
+#
+
+‹ [back to list of Copilot examples](../README.md)
diff --git a/gallery/python-unittest-functions/my_func_test.py b/gallery/python-unittest-functions/my_func_test.py
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+#function that delets number from array
+def delete_numbers(numbers, number):
+    for i in range(len(numbers)):
+        if numbers[i] == number:
+            del numbers[i]
+    return numbers
+
+#unit test for function delete_numbers
+test_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
+test_number = 5
+
+import unittest
+class TestDeleteNumbers(unittest.TestCase):
+    def test_delete_numbers(self):
+        self.assertEqual(delete_numbers(test_list, test_number), [1, 2, 3, 4, 6, 7, 8, 9, 10])
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