Spring Testing - @TestPropertySource with inlined properties example

This example demonstrates how to use 'properties' attribute of @TestPropertySource to specify inlined properties. The inlined properties will override properties coming from the sources loaded via 'locations' attribute (if specified any).

Example

Creating a Spring application

@Service
public class ReportService {
    @Value("${report-subscriber:admin@example.com}")
    private String theSubscriber;

    public String getReportSubscriber() {
        return theSubscriber;
    }
}

src/main/resources/prod.properties

report-subscriber=theManager@example.com

src/main/resources/test.properties

report-subscriber=theDeveloper@example.com

@PropertySource("classpath:prod.properties")
@Configuration
@ComponentScan
public class AppConfig {
    @Bean
    public static PropertySourcesPlaceholderConfigurer propertyConfigInDev() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    public static void main(String[] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(AppConfig.class);
        ReportService rs = context.getBean(ReportService.class);
        System.out.println(rs.getReportSubscriber());
    }
}

Running above class:

Output

theManager@example.com

The JUnit test

@RunWith(SpringRunner.class)
@ContextConfiguration(classes = AppConfig.class)
@TestPropertySource(locations = "classpath:test.properties",
        properties = "report-subscriber=tester@example.com")
public class ReportServiceTests {
    @Autowired
    private ReportService reportService;

    @Test
    public void testReportSubscriber() {
        String s = reportService.getReportSubscriber();
        System.out.println(s);
        Assert.assertEquals("tester@example.com", s);
    }
}

mvn  -q test -Dtest=ReportServiceTests

Output

D:\example-projects\spring-core-testing\test-property-source-with-inlined-properties>mvn  -q test -Dtest=ReportServiceTests

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.logicbig.example.ReportServiceTests
tester@example.com
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.399 sec

Results :

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

Example Project

Dependencies and Technologies Used:

• spring-context 4.3.8.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