Guice 4 has BoundFieldModule 
<https://github.com/google/guice/blob/master/extensions/testlib/src/com/google/inject/testing/fieldbinder/BoundFieldModule.java>
 which 
easily lets you create a module from a test case.

On Thursday, 21 August 2014 16:32:47 UTC-4, Maatary Okouya wrote:
>
> By injector for those test you mean a module where you bind mocks right ? 
> Actually i did something similar. I just did not like to have my production 
> module and test module all in the same place. This is because again, i do 
> package by feature in my test src. So i guess in my case overriding to 
> create the same effect should be fine. Such as overriding in a fixture of a 
> test. 
>
>
> On Thu, Aug 21, 2014 at 10:15 PM, Stephan Classen <[email protected] 
> <javascript:>> wrote:
>
>>  In these kind of situations I usually create an injector specifically 
>> for this test (or group of tests) and bind only the required classes 
>> (mostly mocks and rarely an actual class).
>> Frameworks like juktio help a lot in cutting down the boiler plate code 
>> when creating specific injectors for tests
>>
>>
>>
>> On 08/21/2014 10:10 PM, Maatary Okouya wrote:
>>  
>> Well, 
>>
>>  when you use mock, you might want to verify communication with the mock 
>> object. So you need to bind to a mock to do that. If you want a fake, 
>> because the original object is just to heavy for the test, then you need to 
>> change the binding to. You might well envision a class that needs to or 
>> three other service to perform its work. sometimes you wants to verify how 
>> it interact with one or all the services or you ust want to know the result 
>> when one of the service in actually used. 
>>
>>  Those are the case that i faced few time.
>>
>>  In any case, many thanks for the inputs.
>>  
>>
>> On Thu, Aug 21, 2014 at 9:35 PM, Stephan Classen <[email protected] 
>> <javascript:>> wrote:
>>
>>> I dont think it is wrong to use it. But I don't see a need for it.
>>>
>>> If you are unit testing then you want only those bindings in your 
>>> injector which are required for the test. Hence no need to override 
>>> anything.
>>> If you are doing integration test then you want to have actual code 
>>> executed and no mocks. Again no need to override anything.
>>>
>>> But there is nothing wrong with the overriding capabilities in guice. 
>>> They are fast and reliable. I personly just never used them for testing.
>>> Am 21.08.2014 16:58 schrieb Maatary Okouya <[email protected] 
>>> <javascript:>>:
>>>
>>>  I use package by feature in my test source. I took it from BDD 
>>> practices. I like it because it give you straight away the specification of 
>>> your software. Specification that reflect what you software does and how 
>>> does it do it. How to use your software. From my feature specification all 
>>> the way down to my unit. I actually package by capabilities that the 
>>> features realize. I adhere to the idea that, test are actually 
>>> specification. So when i look at my code, i don't care about the 
>>> implementation detail. I care about its capabilities, what it does. Hence i 
>>> look are the feature that realize those capabilities; That is where i 
>>> connect to the feature spec all the way down to the unit spec. but that is 
>>> out of scope 
>>>
>>>  In any case, why are you against using the module override 
>>> functionality ? What is wrong with it?
>>>  
>>>
>>> On Thu, Aug 21, 2014 at 4:31 PM, Thomas Broyer <[email protected] 
>>> <javascript:>> wrote:
>>>
>>>>  
>>>>
>>>> On Thursday, August 21, 2014 2:42:04 PM UTC+2, scl wrote: 
>>>>>
>>>>>  If you pass dependencies in you constructor which are not required 
>>>>> for the test then your class has most likely too many responsibilities.
>>>>> If all your dependencies are required for the test you have to adapt 
>>>>> the test any ways and should not worry about the compiler errors but 
>>>>> embrace them since they help you find all the test cases which need 
>>>>> update.
>>>>>  
>>>>
>>>>  +1
>>>>
>>>>  Wrt the visibility of the constructors, because it's a generally 
>>>> accepted practice to put tests in the same package as the class under 
>>>> test, 
>>>> using a package-private constructor just works (you could annotate it with 
>>>> some @VisibleForTesting annotation if you still find that "too visible" 
>>>> and 
>>>> fear that some developer would use the constructor directly; with such 
>>>> annotation, or similar comment in the javadoc, you can later blame them 
>>>> for 
>>>> not following the rule ;-) )
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>

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