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https://issues.apache.org/jira/browse/OPENJPA-1153?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12755013#action_12755013
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Pinaki Poddar commented on OPENJPA-1153:
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Thanks Milosz for raising this issue. The current usage of SingleEMFTestCase is
a misnomer -- we essentially create a new EMF on every test method of every
test. In Criteria tests we had used a different scheme where a single EMF
instance is used for all test cases that are using the same set of domain
entities. The performance speed up with this strategy is remarkable.
Further improvement is possible with a smarter scheme that can determine
whether to reuse or create EMF based on the domain entities used by a test.
Currently without that automatic decision, we just partitioned the Criteria
tests into 3-4 buckets -- where all the tests in a bucket tests work with the
same set of domain entities.
> Test suite speed-up outside SingleEMFTestCase
> ---------------------------------------------
>
> Key: OPENJPA-1153
> URL: https://issues.apache.org/jira/browse/OPENJPA-1153
> Project: OpenJPA
> Issue Type: Test
> Affects Versions: 1.1.0, 1.2.1
> Reporter: Milosz Tylenda
> Assignee: Milosz Tylenda
> Priority: Minor
> Fix For: 2.0.0
>
>
> From the developer list [1]:
> We have groups of tests which do not inherit from SingleEMFTestCase and use
> common persistence.xml files to do their setUp()s. Each persistence.xml
> contains all entities used by the group. An individual test uses its group's
> persistence.xml to set itself up although the test usually uses one or two
> entities. Not surprisingly getting database metadata and issuing DELETE TABLE
> statements often takes much more time than the actual test itself.
> The most notable example is a group of tests located in
> openjpa-persistence-jdbc/src/test/java/org/apache/openjpa/persistence/kernel/.
> Their
> openjpa-persistence-jdbc/src/test/resources/org/apache/openjpa/persistence/kernel/common/apps/META-INF/persistence.xml
> contains almost 100 entities. I measured how long does it take to run
> TestDateQueries which uses only one entity but sets itself up with that
> persistence xml. I ran the test suite with -Dtest=TestDateQueries and the
> necessary tables were already in the database:
> - Derby: 20 secs
> - MySQL: 12 secs
> - PostgreSQL: 46 secs
> Then I modified the persistence.xml to include only the entity used by the
> test. The timings for all databases dropped to around 4 seconds.
> My idea is to modify these tests (at least the ones taking the most time) and
> their superclass(-es) to not use persistence.xml but specify used entities as
> setUp() parameters, similarly to what SingleEMFTestCase. It looks like we
> would save at least a few minutes on a test suite run.
> [1]
> http://n2.nabble.com/Test-suite-speed-up-outside-SingleEMFTestCase-td3169383.html
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