[Engine-devel] Any way to break the dao_unit_tests up?

[Shireesh Anjal]

On Monday 20 August 2012 11:16 AM, Mike Kolesnik wrote:
> ----- Original Message -----
>> The DAO unit tests take twice as long as the rest of the test to run
>> is
>> there any way to break them up into two pieces?
>>
> It will not be easy..
>
> The way the tests are built today is with DB-unit.
> DB-unit allows to have an XML file with predefined data (called fixtures) which is used to recreate the DB data each time a test-class is run.
>
> This is all fine, except that in our tests there are (at least) 2 issues:
>   1. The same fixtures.xml file is used in all DAO tests.
>   2. Some DAOs require fixtures for several tables.
>
> Now, we could fix issue #1 by splitting the fixtures file into smaller files, each relating to only one table, which would allow us to run these tests in parallel on the same DB.
> Issue #2 would require to figure out which tests require several fixtures, and have them run isolated from the other tests which require only a single table.
>
> A simpler solution could be to have the tests run each on it's own db schema (or it's own db) which eliminates the dependencies and allows to run all in parallel, but is a bit more complicated to maintain (we would need some script that generates these schemas/dbs for tests automatically) and keeping multiple schemas up to date would also require CPU time.
>
> This is speaking in terms of the tests themselves, without considering the build process itself.

There are two issues here:

1) DB connection is created during initialization of every test case, 
and destroyed at the end of each test case execution
2) The fixtures data is inserted during initialization of every test case

I think both of these can be resolved by
  - creating the test data only during initialization of the first test 
case, which will include creating the connection (with auto-commit = 
false), inserting fixtures data and committing it
  - rolling back any changes done to the database during test case 
execution in the tearDown method

I just tried this in two phases. Using the same connection across all 
test cases brought down the dao unit tests run time from 4:42.683s to 
1:07.628s, and inserting the fixtures data only once further brought it 
down to just 22.295s ! (on my local development machine)

I've just sent a patch with these changes: http://gerrit.ovirt.org/7336

>
>> --
>> Thanks
>> Robert Middleswarth
>> @rmiddle (twitter/IRC)
>>
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