In Python scientific computing, how do I write unit tests?

In Python scientific computing, writing unit tests is essential to ensure the correctness of your code. The `unittest` module is commonly used for this purpose. Below is an example of how to write a simple unit test for a function that adds two numbers.


import unittest

# Sample function to be tested
def add(a, b):
    return a + b

# Unit test class
class TestAddFunction(unittest.TestCase):
    
    def test_add(self):
        self.assertEqual(add(1, 2), 3)
        self.assertEqual(add(-1, 1), 0)
        self.assertEqual(add(-1, -1), -2)

# Run the tests
if __name__ == '__main__':
    unittest.main()