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| <small><a href="./../index.html">Home</a> » <a href="./../dev/">Dev</a></small><br> |
| <h1>iTests Overview |
| |
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| |
| <p><a name="iTestsOverview-Motivation"></a></p> |
| |
| <h1>Motivation</h1> |
| |
| <p>The basic idea behind itests that makes them slightly different than plain |
| junit tests ran by maven is that it's assumed that there are other systems |
| (servers, databases, brokers, etc) that need to be started or connected to |
| before the tests can run. The tests themselves don't setup the other |
| systems themselves so that the tests don't become coupled with them and you |
| can actually swap out various aspects of those systems behind the back of |
| the tests; server version, protocol implementation, java version, VM |
| implementation, database provider, operating systems, even using embedded |
| servers and embedded databases.</p> |
| |
| <p>The idea came from the tests in OpenEJB that do this. It took a lot of |
| work to get them to run as part of the maven build and the itest plugin was |
| the result.</p> |
| |
| <p>Definitely give those a look at: |
| http://svn.apache.org/viewvc/tomee/tomee/trunk/itests/</p> |
| |
| <p><a name="iTestsOverview-Pluggingin"></a></p> |
| |
| <h1>Plugging in</h1> |
| |
| <p>You can have systems started and stopped before and after the tests in a |
| number of ways.</p> |
| |
| <p><a name="iTestsOverview-Inmaven1"></a></p> |
| |
| <h2>In maven 1</h2> |
| |
| <p>This series of articles established a basic technique for Container Driven |
| Testing with Maven and OpenEJB using preGoals and postGoals to do server |
| and databse setup and teardown before and after Maven runs the unit tests. <a href="http://www.theserverside.com/articles/article.tss?l=ContainerDrivenTestingSeries">http://www.theserverside.com/articles/article.tss?l=ContainerDrivenTestingSeries</a></p> |
| |
| <p>This concept evolved from OpenEJB into a reusable maven plugin created by |
| Dain Sundstrom that gave these integration tests (itests) their own source |
| directory and added itest:setup and itest:teardown goals to your maven |
| build rather than just using a preGoal on "test:test" for setup and a |
| postGoal on "test:test" for teardown. The advantage to the new goals is |
| that maven does not call any postGoals on "test:test" if the tests failed; |
| something the above series of articles hacked around with an odd bit of |
| jelly code.</p> |
| |
| <p>The new itest plugin was checked into Geronimo with the expectation that |
| Geronimo would also use it. After some time of OpenEJB still being the |
| only consumer of it, it was moved into the Maven repository where they keep |
| it in the Maven sandbox. </p> |
| |
| <p><a href="http://maven.apache.org/plugins-sandbox/itest/">http://maven.apache.org/plugins-sandbox/itest/</a></p> |
| |
| <p>ActiveMQ later started using the itest plugin and now has a large suite of |
| their own JMS specific integration tests.</p> |
| |
| <p><a name="iTestsOverview-Inmaven2"></a></p> |
| |
| <h2>In maven 2</h2> |
| |
| <p>The concept of integration tests (itests) has been built into the lifecycle |
| of maven 2, so it is no longer required to have the itest plugin around to |
| get the extra "itest:setup" and "itest:teardown" goals. See this document |
| for more info: <a href="http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html">http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html</a></p> |
| |
| <p><a name="iTestsOverview-Injunitsetupandteardown"></a></p> |
| |
| <h2>In junit setup and teardown</h2> |
| |
| <p>The ejb tests in particular require you to plug in facades for the server |
| and the database so the client (the tests) can say "give me an initial |
| context" or "create these tables i need" in a generic way. It's assumed |
| that those systems were setup and guaranteed in working state in the itest |
| setup phase. It's also guaranteed that the server and database facades |
| know how to contact the server or database to carry out the "give me an |
| initial context" and "create these tables" calls.</p> |
| |
| <p>Here are some implementations of the database provider for reference: |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/AxionTestDatabase.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/DerbyTestDatabase.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/InstantDbTestDatabase.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/PostgreSqlTestDatabase.java</p> |
| |
| <p>Here are some implementations for the server facades: |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/CorbaTestServer.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/RemoteTestServer.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/IvmTestServer.java |
| - |
| http://cvs.openejb.org/viewrep/openejb/openejb/modules/itests/src/itest/org/openejb/test/RiTestServer.java</p> |
| |
| <p>Using the itest concept you could setup any system you need before hand, |
| then just provide an abstraction of that system to the actual tests. So |
| it's not limited to just a server or a database. You could do queue, |
| topic, clustering heartbeat agent, directory server, etc.</p> |
| |
| <p><a name="iTestsOverview-Testingmatrix"></a></p> |
| |
| <h1>Testing matrix</h1> |
| |
| <p>Even with just what we have we can get quite far. In a perfect world, we |
| would actually test against the full matrix:</p> |
| |
| <p>Server: Local, Database: Axion |
| Server: Local, Database: Derby |
| Server: Local, Database: PostgreSQL |
| Server: Remote, Database: Axion |
| Server: Remote, Database: Derby |
| Server: Remote, Database: PostgreSQL |
| Server: Corba, Database: Axion |
| Server: Corba, Database: Derby |
| Server: Corba, Database: PostgreSQL</p> |
| |
| <p>We had that going for a short while years ago but it was just too much |
| infrastructure for me to keep running. It would be nice to get Oracle and |
| MySQL in that list as well.</p> |
| |
| <p>In an even more perfect world we'd test against not just different Server |
| and Database combinations, but JVM versions as well.</p> |
| |
| <p>Server: Local, Database: Axion, JVM: 1.3 |
| Server: Local, Database: Axion, JVM: 1.4 |
| Server: Local, Database: Axion, JVM: 1.5 |
| Server: Local, Database: Derby, JVM: 1.3 |
| Server: Local, Database: Derby, JVM: 1.4 |
| Server: Local, Database: Derby, JVM: 1.5 |
| Server: Local, Database: PostgreSQL, JVM: 1.3 |
| Server: Local, Database: PostgreSQL, JVM: 1.4 |
| Server: Local, Database: PostgreSQL, JVM: 1.5 |
| Server: Remote, Database: Axion, JVM: 1.3 |
| Server: Remote, Database: Axion, JVM: 1.4 |
| Server: Remote, Database: Axion, JVM: 1.5 |
| Server: Remote, Database: Derby, JVM: 1.3 |
| Server: Remote, Database: Derby, JVM: 1.4 |
| Server: Remote, Database: Derby, JVM: 1.5 |
| Server: Remote, Database: PostgreSQL, JVM: 1.3 |
| Server: Remote, Database: PostgreSQL, JVM: 1.4 |
| Server: Remote, Database: PostgreSQL, JVM: 1.5 |
| Server: Corba, Database: Axion, JVM: 1.3 |
| Server: Corba, Database: Axion, JVM: 1.4 |
| Server: Corba, Database: Axion, JVM: 1.5 |
| Server: Corba, Database: Derby, JVM: 1.3 |
| Server: Corba, Database: Derby, JVM: 1.4 |
| Server: Corba, Database: Derby, JVM: 1.5 |
| Server: Corba, Database: PostgreSQL, JVM: 1.3 |
| Server: Corba, Database: PostgreSQL, JVM: 1.4 |
| Server: Corba, Database: PostgreSQL, JVM: 1.5</p> |
| |
| <p>If you add JVM vendors (Sun, IBM, Apple, BEA) to the list, the combinations |
| goes up to like 109. Throw on OS implementations and you get an insane |
| number of test runs to complete.</p> |
| |
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