How do I mock the constructor of an object?

[Antony Raj]

When I call a method of object x, it instantiates an another object there. I want to mock it out.

I tried in the following way.

when(ProductFunction).__init__(ANY()).thenReturn(product_function)

It doesn't work. Can any of you offer me a help please?

[Justin Hopper]

Hello Antony,

Can you provide a bit more context so I can better assist you? Such as the test code leading up to this call and the production code or declarations for the ProductFunction.

Is there a reason you can't mock the Class Production function and allow the function mentioned in your question to return an instance?

For example:

when(ProductFunction).a_func(ANY()).thenReturn("test value")

object_x.call_product_function()
# some internal call to production function