It's a script that's supposed to run in the background for an inventory 
management program. The basic idea is that it periodically collects Order 
objects that are associated with a particular Status (1-M foreign key, 
though more like 1-1 in practice). Orders have one or many Orderlines. Then 
it makes all the necessary changes to various quantity fields in various 
inventory tables. So if an Orderline contains a request for 3 of a 
particular item, then 3 of that item are reserved in inventory (or 
backordered or however it needs to go). So far that part has been fine. 

But when that's finished, the Orders and associated Orderlines need updated 
Statuses. The assert statements say that only some of them were updated, 
even though I watched them all update correctly--it's like a partial 
rollback happens before the test finishes. The other failing test checks 
that the process of updating the statuses also logs the events properly in 
a History table; but when the test is run as a suite, the event is only 
partially logged--some records are created and some aren't. But the test 
results are always consistent for the way the test was run.

So it's just Python and SQL Server--though we do have to use pyodbc to make 
Django recognize SQL Server, so there's an extra 'layer' there. 

Thank you for the reply, Dan!
Heather


On Thursday, July 5, 2018 at 10:50:49 AM UTC-4, Dan Tagg wrote:
>
> Hi Heather,
>
> What is it you are testing? I have had issues with this kind of thing when 
> testing forms that are programatically changing dropdown list / default 
> values.
>
> Dan
>
> On 5 July 2018 at 14:24, <clavie...@gmail.com <javascript:>> wrote:
>
>> Hello, I'm simplifying a previous post. I just started using Django a few 
>> months ago, and for some reason I'm still having trouble getting my mind 
>> around the way Django thinks about some things. 
>>
>> I have a test class that contains two specific tests that always pass 
>> when run just by themselves, but always fail when run with the rest of the 
>> test class. 
>>
>> One of the tests in particular is very puzzling, because I can step 
>> through the entire method under test and watch everything happen exactly 
>> the way it should--the database field values are changed correctly and the 
>> correct values are returned. But after the return statement, the values are 
>> different than they were before the return statement. They are consistently 
>> different, so *something* is happening behind the scenes... but I have no 
>> idea what... So I can't tell if my tests are flawed or if my code under 
>> test is flawed.
>>
>> Django 2.0 with MS SQL Server 2014. Any suggestions at all appreciated, 
>> because I'm completely out of ideas. I haven't been able to get 
>> TransactionTestCase to work at all, though--set-up data that works 
>> flawlessly with TestCase breaks TransactionTestCase, and I don't know why. 
>>
>> Thank you!
>> Heather
>>
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