Python Mockito: How do I mock open()

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This is the code I want to test 

file_handle = open('filename')
content = file_handle.read()

Now, in my test file, I want to mock open()

I tried using mockito when as below 

when(open(...)).thenReturn(dummy_response)
mocking python
1 Answers

I found a way, which is not straightforward but works like a charm 

import builtins

when(builtins).open(...).thenReturn(dummy_response)
user_28705720
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