lunes, julio 02, 2012

NoSQLUnit 0.3.1 Released




And the last known survivor, Stalks his prey in the night, And he's watching us all with the, Eye of the tiger (Eye Of The Tiger - Survivor)

NoSQLUnit is a JUnit extension to make writing unit and integration tests of systems that use NoSQL backend easier. Visit official page for more information.

In 0.3.1 release, two new features among some bug fixes has been implemented. These two new features are the ability of create simultaneous connections to different backends at same test, and partial support for jsr-330 specification.


Simultaneous engines

Sometimes applications will contain more than one NoSQL engine, for example some parts of your model will be expressed better as a graph ( Neo4J for example), but other parts will be more natural in a column way (for example using Cassandra ). NoSQLUnit supports this kind of scenarios by providing in integration tests a way to not load all datasets into one system, but choosing which datasets are stored in each backend.

For declaring more than one engine, you must give a name to each database Rule using connectionIdentifier() method in configuration instance.


And also you need to provide an identified dataset for each engine, by using withSelectiveLocations attribute of @UsingDataSet annotation. You must set up the pair "named connection" / datasets.


In example we are refreshing database declared on previous example with data located at test3 file.

Also works in expectations annotation:


When you use more than one engine at a time you should take under consideration next rules:
  • If location attribute is set, it will use it and will ignore withSelectiveMatcher attribute data. Location data is populated through all registered systems.
  • If location is not set, then system tries to insert data defined in withSelectiveMatcher attribute to each backend.
  • If withSelectiveMatcher attribute is not set, then default strategy is taken. Note that default strategy will replicate all datasets to defined engines.
You can also use the same approach for inserting data into same engine but in different databases. If you have one MongoDb instance with two databases, you can also write tests for both databases at one time. For example:



Support for JSR-330

NoSQLUnit supports two annotations of JSR-330 aka Dependency Injection for Java. Concretely @Inject and @Named annotations.

During test execution you may need to access underlying class used to load and assert data to execute extra operations to backend. NoSQLUnit will inspect @Inject annotations of test fields, and try to set own driver to attribute. For example in case of MongoDb, com.mongodb.Mongo instance will be injected.


Note that in example we are setting this as second parameter to the Rule.

But if you are using more than one engine at same time, you need a way to distinguish each connection. For fixing this problem, you must use @Named annotation by putting the identifier given in configuration instance. For example:


Next release will support Neo4J and Cassandra. Stay in touch with the project and of course I am opened to any ideas that you think that could make NoSQLUnit better.


3 comentarios:

Nate McCall dijo...

Nice! I just forked - expect a cassandra-compatible pull request shortly.

Alex Soto dijo...

Thanks for reading my blog and also forking the project. I expect that at the end of next week I will support Neo4J. Then in two more weeks I am sure it will have Cassandra support.

Thanks again.

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