Spring Testing - Resolving active profiles programmatically by using ActiveProfilesResolver

ActiveProfilesResolver interface can be implemented to programmatically select profiles for Spring Tests. We can register our ActiveProfilesResolver implementation with the 'resolver' attribute of @ActiveProfiles annotation. Let's see an example how to do that.

Example

Creating a simple Spring application

@Configuration
public class AppConfig {
    @Bean
    @Profile("windows")
    public MyService myServiceA() {
        return new MyServiceA();
    }

    @Bean
    @Profile("other")
    public MyService myServiceB() {
        return new MyServiceB();
    }
}

public interface MyService {
    public String doSomething();
}

public class MyServiceA implements MyService {
    @Override
    public String doSomething() {
        return "in " + this.getClass().getSimpleName();
    }
}

public class MyServiceB implements MyService {
    @Override
    public String doSomething() {
        return "in " + this.getClass().getSimpleName();
    }
}

Implementing MyActiveProfilesResolver

public class MyActiveProfilesResolver  implements ActiveProfilesResolver{
    @Override
    public String[] resolve(Class<?> testClass) {
        String os = System.getProperty("os.name");
        String profile = (os.toLowerCase().startsWith("windows")) ? "windows" : "other";
        return new String[]{profile};
    }
}

The JUnit test

Following test will fail if run other than Windows O.S.

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = AppConfig.class)
@ActiveProfiles(resolver = MyActiveProfilesResolver.class)
public class MyServiceTests {

    @Autowired
    private MyService dataService;

    @Test
    public void testDoSomething() {
        String s = dataService.doSomething();
        System.out.println(s);
        Assert.assertEquals("in MyServiceA", s);
    }
}

mvn  -q test -Dtest=MyServiceTests

Output

D:\example-projects\spring-core-testing\active-profile-resolver-example>mvn  -q test -Dtest=MyServiceTests

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.logicbig.example.MyServiceTests
in MyServiceA
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.371 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

Example Project

Dependencies and Technologies Used:

• spring-context 4.3.9.RELEASE: Spring Context.
• spring-test 4.3.9.RELEASE: Spring TestContext Framework.
• junit 4.12: JUnit is a unit testing framework for Java, created by Erich Gamma and Kent Beck.
• JDK 1.8
• Maven 3.3.9