用于DAO JUnit测试的SpringBootTest

Question

I am attempting the following unit test of a DAO.

I am unable to get the DataSource recognized.

Can I get a tip on how to resolve this?

Details below

@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class EntityDaoTest {

    @Autowired 
    protected EntityDao entityDao;

    @Before
    public void setup()
    {

    }

    @Test
    public void test() throws InternalServerException
    {
        List<Entity> entities = entityDao.list();
        assert(entities.size()==0);
    }
}

The relevant aspects of the DAO class are as follows

@Repository
public class EntityDao extends GenericDao<Entity>{

    public EntityDao(DataSource dataSource) {/.../}
}

My src/test/resources/application.properties file is as follows

# Database
spring.datasource.url=jdbc:mysql://localhost:3306/db
spring.datasource.username=dbuser
spring.datasource.password=dbpass

Trace from running as JUnit test in Eclipse

java.lang.IllegalStateException: Failed to load ApplicationContext
...
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'entityController': Unsatisfied dependency expressed through field 'entityDao': Error creating bean with name 'entityDao' defined in file .../target/classes/hitstpa/dao/EntityDao.class]: Unsatisfied dependency expressed through constructor parameter 0: No qualifying bean of type [javax.sql.DataSource] found for dependency [javax.sql.DataSource]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; 

...
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'entityDao' defined in file [/home/fmason/workspace/hitstpa/target/classes/hitstpa/dao/EntityDao.class]: Unsatisfied dependency expressed through constructor parameter 0: No qualifying bean of type [javax.sql.DataSource] found for dependency [javax.sql.DataSource]: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] found for dependency [javax.sql.DataSource]: expected at least 1 bean which qualifies as autowire candidate for this dependency. ...`

Application structure

-src

--main

---java

----Application.java

----com

----hitstpa

-----controller

-----dao

------EntityDao.java

-----model

---resources

----application.properties

--test

---java

----hitstpa

-----dao

------EntityDaoTestDOTjava

---resources

----applicationDOTproperties

Answer 1

For the record, I believe this is not a good unit test. This test requires that a mysql databases exists on localhost.

---

Anyhow, the errors suggest that the Spring Context isn't loaded correctly . When using SpringBootTest , Spring looks for the configuration using the test's package as root. So, if it's lower than your Configuration classes, it won't them.

Take a look at Spring's documentation :

The search algorithm works up from the package that contains the test until it finds a @SpringBootApplication or @SpringBootConfiguration annotated class. As long as you've structure your code in a sensible way your main configuration is usually found.

Solution:

You can either move your tests to the same level as your SpringBoot Main class or change it to: @SpringBootTest(classes = YourSpringBootMainClass.class)

Answer 2

First of all for integration tests you need an integration Db with some fixed data.

• Now you need to create a configuration class which will create the integration test specific dependencies(I have named it as DbConfig .java )
• Next is add @ContextConfiguration annotation to the integration test class and provide DbConfig.java , so that when test runs it will create the datasource dependency and inject it to the container

Sample Code

    @Configuration
    public class DbConfig {

    @Bean
    public DataSource dataSource() {

        //Create the DataSource with integration-DB properties

        return dataSource;
    }
}

    @RunWith(SpringJUnit4ClassRunner.class)
    @SpringBootTest
    @ContextConfiguration(classes=DbConfig.class)
    public class EntityDaoTest {

    }