What are some examples of mocking in Python?

What are some examples of mocking in Python?

Mocking in Python is a technique used in unit testing to replace real objects with mock objects. This allows you to test components in isolation. For example, you can use the unittest.mock library to create mock objects.

Can you show me a simple code example?

Sure! Here's a basic example:

from unittest.mock import Mock

# Create a mock object
mock_obj = Mock()

# Define a return value for a method
mock_obj.method.return_value = 'Hello, World!'

# Call the method
result = mock_obj.method()
print(result)  # Output: Hello, World!

What about mocking a function instead of a class?

You can mock a function in a similar way. Here's an example:

from unittest.mock import patch

# Function to be mocked
def fetch_data():
    return 'Real Data'

# Test function with mocking
with patch('__main__.fetch_data', return_value='Mocked Data'):
    print(fetch_data())  # Output: Mocked Data