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Integration between the Spring testing framework and DBUnit

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README.md

Introduction

Introduction

Spring DBUnit provides integration between the Spring testing framework and the popular DBUnit project. It allows you to setup and teardown database tables using simple annotations as well as checking expected table contents once a test completes.

The project can be configured to run DBUnit tests either using a Spring TestExecutionListener or a JUnit @Rule. Using a JUnit @Rule allows for easier configuration but is only available if you are using JUnit 4.7 or above.

Configuration using a Spring TestExecutionListener

NOTE: This section should be followed when configuring DBUnit tests to run using a Spring TestExecutionListener. See below if you want to configure DBUnit tests using a JUnit @Rule.

To have Spring process DBUnit annotations you must first configure your tests to use the DbUnitTestExecutionListener class. To do this you need to use the Spring @TestExecutionListeners annotation. Generally, as well as DbUnitTestExecutionListener, you will also want to include the standard Spring listeners as well. Here are the annotations for a typical JUnit 4 test:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
@TestExecutionListeners({ DependencyInjectionTestExecutionListener.class,
        DirtiesContextTestExecutionListener.class,
        TransactionalTestExecutionListener.class,
        DbUnitTestExecutionListener.class })

See the Spring JavaDocs for details of the standard listeners.

In order to access the database, Spring DBUnit requires a bean to be registered in you test context XML file. By default a bean named or can be used (see the Advanced Configuration section below if you need to use another name). The bean can reference either a IDatabaseConnection or more typically a standard Java DataSource. Here is a typical configuration for accessing an in-memory hypersonic database:

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="org.hsqldb.jdbcDriver" />
    <property name="url" value="jdbc:hsqldb:mem:paging" />
    <property name="username" value="sa" />
    <property name="password" value="" />
</bean>

Once you have configured the DbUnitTestExecutionListener and provided the bean to access you database you can use the DBUnit annotations.

Configuration using a JUnit @Rule

NOTE: JUnit @Rule configuration is not currently working with Spring 3.1 (https://jira.springsource.org/browse/SPR-9232), until this issue is resolved please use the TestExecutionListener.

This section should be followed when configuring DBUnit tests to run using a JUnit 4.7+ @Rule. See above if you want to configure DBUnit tests using a Spring TestExecutionListener.

To have JUnit process DBUnit annotation you must configure your tests to use the DbUnitRule @Rule. To do this you need to use the JUnit @Rule annotation in conjunction with the DbUnitRule class.

@Rule
public DbUnitRule dbUnit = new DbUnitRule();

You will also need to ensure that your test class provides access to a DataSource or IDatabaseConnection. You can either use the setDataSource or setDatabaseConnection methods on the rule or, more commonly, inject a datasource to a private field of your test.

@Autowired
private DataSource dataSource;

Once your rule is defined you can use the DBUnit annotations.

Setup and TearDown

Note: You need to complete the steps from the configuration section above before any annotations can be used. Without appropriate configuration DBUnit annotations will be silently ignored.

The @DatabaseSetup and @DatabaseTearDown annotations can be used to configure database table before tests execute and reset them once tests have completed.

Setup

The @DatabaseSetup annotation indicates how database tables should be setup before test methods are run. The annotation can be applied to individual test methods or to a whole class. When applied at the class level the setup occurs before each method in the test. The annotation value references a file that contains the table DataSet used when resetting the database. Typically this is a standard DBUnit XML file, although it is possible to load custom formats (see below).

Here is a typical setup annotation. In this case a file named sampleData.xml is contained in the same package as the test class.

@DatabaseSetup("sampleData.xml")

It is also possible to reference specific resource locations, for example:

@DatabaseSetup("/META-INF/dbtest/sampleData.xml")

By default setup will perform a operation, this means that all data from tables referenced in the DataSet XML will be removed before inserting new rows. The standard DBUnit operations are supported using type attribute. See the JavaDocs for full details.

TearDown

The @DatabaseTearDown annotation can be used to reset database tables once a test has completed. As with @DatabaseSetup the annotation can be applied at the method or class level. When using @DatabaseTearDown use the value and type attributes in the same way as @DatabaseSetup.

Note: If you are running a teardown in conjunction with a @Transactional test you may need to use an alternative configuration. See the section on below.

Expected results

The @ExpectedDatabase annotation can be used to verify the contents of database once a test has completed. You would typically use this annotation when a test performs an insert, update or delete. You can apply the annotation on a single test method or a class. When applied at the class level verification occurs after each test method.

The @ExpectedDatabase annotation takes a value attribute that references the DataSet file used to verify results. Here is a typical example:

@ExpectedDatabase("expectedData.xml")

The @ExpectedDatabase annotation supports two different modes. DatabaseAssertionMode.DEFAULT operates as any standard DbUnit test, performing a complete compare of the expected and actual datasets. DatabaseAssertionMode.NON_STRICT will ignore tables and column names which are not specified in the expected dataset but exist in the actual datasets. This can be useful during integration tests performed on live databases containing multiple tables that have many columns, so one must not specify all of them, but only the 'interesting' ones.

Note: If you are using this annotation in conjunction with a @Transactional test you may need to use an alternative configuration. See the section on below.

Transactions

If you have configured DBUnit tests to run using the are DbUnitTestExecutionListener and are also using the TransactionalTestExecutionListener you may experience problems with transactions not being started before your data is setup, or being rolled back before expected results can be verified. In order to support @Transactional tests with DBUnit you should use the TransactionDbUnitTestExecutionListener class.

Here are the annotations for a typical JUnit 4 test:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration
@Transactional
@TestExecutionListeners({ DependencyInjectionTestExecutionListener.class,
        DirtiesContextTestExecutionListener.class,
        TransactionDbUnitTestExecutionListener.class })

Transactions start before @DatabaseSetup and end after @DatabaseTearDown and @ExpectedDatabase.

Advanced configuration of the DbUnitTestExecutionListener

NOTE: This section only applies when you are using the DbUnitTestExecutionListener. See below if you are using a JUnit @Rule.

The @DbUnitConfiguration annotation can be used if you need to configure advanced options for DBUnit.

The databaseConnection attribute allows you to specify a specific bean name from the Spring Context that contains the database connection. When not specified the names or can be used. The bean must be either an IDatabaseConnection or a DataSource.

The dataSetLoader attribute allows you to specify a custom loader that will be used when reading datasets (see below).

Advanced configuration of the DbUnitRule

NOTE: This section only applies when you are using the DBUnitRule JUnit @Rule. See above if you are using the DbUnitTestExecutionListener.

The DBUnitRule JUnit rule will inspect private fields of your test class in order to configure itself. If your test includes either a DataSource field or an IDatabaseConnection then this will be used to obtain a database connection. You can also include a DataSetLoader field if you want to use a custom loader when reading datasets (see below).

If you need more fine-grain control you can also call the setter methods directly on the rule.

Custom IDatabaseConnections

In some situations you may need to create an IDatabaseConnection with a specific DBUnit configuration. Unfortunately, the standard DBUnit DatabaseConfig class cannot be easily using with Spring. In order to overcome this limitation, the DatabaseConfigBean provides an alternative method to configure a connection; with standard getter/setter access provided for all configuration options. The DatabaseDataSourceConnectionFactoryBean accepts a configuration property and should be used to construct the final connection. Here is a typical example:

<bean id="dbUnitDatabaseConfig" class="com.github.springtestdbunit.bean.DatabaseConfigBean">
    <property name="skipOracleRecyclebinTables" value="true"/>
</bean>

<bean id="dbUnitDatabaseConnection" class="com.github.springtestdbunit.bean.DatabaseDataSourceConnectionFactoryBean">
    <property name="databaseConfig" ref="dbUnitDatabaseConfig"/>
</bean>

NOTE: In most circumstances the username and password properties should not be set on the DatabaseDataSourceConnectionFactoryBean. These properties will cause DBUnit to start a new transaction and may cause unexpected behaviour.

Writing a DataSet Loader

By default DBUnit datasets are loaded from flat XML files. If you need to load data from another source you will need to write your own DataSet loader and configure your tests to use it. Custom loaders must implement the DataSetLoader interface and provide an implementation of the loadDataSet method. The AbstractDataSetLoader is also available and provides a convenient base class for most loaders.

Here is an example loader that reads data from a CSV formatted file.

public class CsvDataSetLoader extends AbstractDataSetLoader {
    protected IDataSet createDataSet(Resource resource) throws Exception {
        return new CsvURLDataSet(resource.getURL());
    }
}

See above for details of how to configure a test class to use the loader.

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