I almost had this working with Mockito but hit a wall...it's possible 
PowerMock will solve the issue. I'll give this a go!

On Monday, July 8, 2019 at 6:58:44 PM UTC-4, Gavin Mogan wrote:
>
> You can probably use powermock to override the static 
> Calendar.getInstance()
>
> But I don't easily know if that function is used to generate the internal 
> build time, but you can probably track it down with a breakpoint in 
> build.class
>
> On Mon, Jul 8, 2019 at 3:36 PM 'Benjamin Beggs' via Jenkins Developers <
> [email protected] <javascript:>> wrote:
>
>> I think a full implementation with Mockito is untenable. It seems I would 
>> need to mock an excessive amount of function returns and the result may 
>> still be inflexible and finnicky.
>>
>> I'll follow the JenkinsRule method you're talking about...I expect I can 
>> still mock the date data. Thanks for the help here. :)
>>
>> On Monday, July 8, 2019 at 6:08:33 PM UTC-4, Gavin Mogan wrote:
>>>
>>> That shouldn't be the case if you use JenkinsRule, actually create the 
>>> project, and run a quick echo pipeline a few times.
>>>
>>> I know from working on the java 11 stuff, that mockito has trouble 
>>> mocking functions that are final, it'll silently not do so. Its going to 
>>> save you a ton of headaches to use JenkinsRule.
>>>
>>> @Rule
>>> public JenkinsRule j = new JenkinsRule()
>>>
>>> p = j.createFreeStyleProject("name");
>>> jenkins.assertBuildStatus(Result.SUCCESS, p.scheduleBuild2(0)); // build 
>>> 1
>>> jenkins.assertBuildStatus(Result.SUCCESS, p.scheduleBuild2(0)); // build 
>>> 2
>>> jenkins.assertBuildStatus(Result.SUCCESS, p.scheduleBuild2(0)); // build 
>>> 3
>>>
>>> but i see you are messing with dates, so that might be trickier, i'm not 
>>> sure.
>>>
>>> You can try subclassing FreeStyleProject, and overriding the function to 
>>> return the value you want. 
>>> If that works fine, then its how the function matching/overriding works 
>>> in mockito, if it doesn't work, then its the weird final/static stuff that 
>>> mockito has trouble with. You might need to also use powermock and prepare 
>>> for test.
>>>
>>> On Mon, Jul 8, 2019 at 12:40 PM 'Benjamin Beggs' via Jenkins Developers <
>>> [email protected]> wrote:
>>>
>>>> The issue here is with my build history instantiation. All build 
>>>> retrieve calls return null regardless of method (getFirstBuild, 
>>>> getLastBuild, getBuildByNumber, etc).
>>>>
>>>> On Monday, July 8, 2019 at 3:24:47 PM UTC-4, Benjamin Beggs wrote:
>>>>>
>>>>> I will investigate this further, thanks for pointing this 
>>>>> implementation out to me.
>>>>>
>>>>> On Monday, July 8, 2019 at 1:52:40 PM UTC-4, Jesse Glick wrote:
>>>>>>
>>>>>> On Mon, Jul 8, 2019 at 1:39 PM 'Benjamin Beggs' via Jenkins 
>>>>>> Developers 
>>>>>> <[email protected]> wrote: 
>>>>>> > Do you have an example of a similar implementation for unit testing 
>>>>>> using jenkinsrule? I may try just porting the tests over to this. 
>>>>>>
>>>>>> I would definitely advise using `JenkinsRule` over mocking 
>>>>>> frameworks. 
>>>>>> Slower, but much more realistic (and much more likely to continue 
>>>>>> running after internal refactorings). Example: 
>>>>>>
>>>>>>
>>>>>> https://github.com/jenkinsci/jenkins/blob/a6f5b2b1288d15cd2ea5c2fd9b8916e6397bf795/test/src/test/java/hudson/tasks/LogRotatorTest.java#L67-L82
>>>>>>  
>>>>>>
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