Integration Testing

In an earlier section of this tutorial we looked at unit testing, but integration tests are at least as important, probably more so, as they exercise the entire application from an end-users perspective, rather than an individual part.

Integration tests are not written using Selenium or similar, so avoid the fragility and maintenance effort that such tests often entail. Instead, the framework provides the WrapperFactory domain service which simulates the user interface in a type-safe way.

Ex 9.1: Testing bookVisit using an integtest

In this exercise we’ll test the bookVisit mixin action (on Pet entity).

Solution

git checkout tags/09-01-bookVisit-integ-test
mvn clean package jetty:run

Tasks

in the pom.xml of the visits module, add the following dependency:

module-visits/pom.xml

<dependency>
    <groupId>org.apache.causeway.mavendeps</groupId>
    <artifactId>causeway-mavendeps-integtests</artifactId>
    <type>pom</type>
    <scope>test</scope>
</dependency>

add an abstract class VisitsModuleIntegTestAbstract for the visits module, for other integ tests to subclass:

VisitsModuleIntegTestAbstract.java

@SpringBootTest(
        classes = VisitsModuleIntegTestAbstract.TestApp.class
)
@ActiveProfiles("test")
public abstract class VisitsModuleIntegTestAbstract
        extends CausewayIntegrationTestAbstractWithFixtures {

    @SpringBootConfiguration
    @EnableAutoConfiguration
    @Import({

            CausewayModuleCoreRuntimeServices.class,
            CausewayModuleSecurityBypass.class,
            CausewayModulePersistenceJpaEclipselink.class,
            CausewayModuleTestingFixturesApplib.class,

            VisitsModule.class
    })
    @PropertySources({
            @PropertySource(CausewayPresets.H2InMemory_withUniqueSchema),
            @PropertySource(CausewayPresets.UseLog4j2Test),
    })
    public static class TestApp {
    }
}

also update the application-test.yml file for the visits module, to ensure that the database schemas for both modules are created:
module-visits/src/test/resources/application-test.yml
```
causeway:
  persistence:
    schema:
      auto-create-schemas: pets,visits
```
add a class Bootstrap_IntegTest integration test, inheriting from the `VisitsModuleIntegTestAbstract:
Bootstrap_IntegTest.java
```
public class Bootstrap_IntegTest extends VisitsModuleIntegTestAbstract {

    @Test
    public void checks_can_bootstrap() {}
}
```
Make sure this test runs and passes in both the IDE and using "mvn clean install".

Now we can write our actual test:

Now add a class Pet_bookVisit_IntegTest integration test, also inheriting from the `VisitsModuleIntegTestAbstract:

Pet_bookVisit_IntegTest.java

public class Pet_bookVisit_IntegTest extends VisitsModuleIntegTestAbstract {

    @BeforeEach
    void setup() {
        fixtureScripts.run(new Pet_persona.PersistAll());                       (1)
    }

    @Test
    public void happy_case() {

        // given
        Pet somePet = fakeDataService.enums().anyOf(Pet_persona.class)          (2)
                        .findUsing(serviceRegistry);
        List<Visit> before = visitRepository.findByPetOrderByVisitAtDesc(somePet);

        // when
        LocalDateTime visitAt = clockService.getClock().nowAsLocalDateTime()    (3)
                                    .plusDays(fakeDataService.ints().between(1, 3));
        String reason = fakeDataService.strings().upper(40);                    (3)

        wrapMixin(Pet_bookVisit.class, somePet).act(visitAt, reason);           (4)

        // then
        List<Visit> after = visitRepository.findByPetOrderByVisitAtDesc(somePet);
        after.removeAll(before);
        assertThat(after).hasSize(1);                                           (5)
        Visit visit = after.get(0);

        assertThat(visit.getPet()).isSameAs(somePet);                           (6)
        assertThat(visit.getVisitAt()).isEqualTo(visitAt);                      (6)
        assertThat(visit.getReason()).isEqualTo(reason);                        (6)
    }

    @Inject FakeDataService fakeDataService;
    @Inject VisitRepository visitRepository;
    @Inject ClockService clockService;

}

1	uses same fixture script used for prototyping to set up `Pet`s and their `PetOwner`s.
2	uses the FakeDataService to select a `Pet` persona at random and uses that person to look up the corresponding domain object.
3	sets up some randomised but valid argument values
4	invokes the action, using the WrapperFactory to simulate the UI
5	asserts that one new `Visit` has been created for the `Pet`.
6	asserts that the state of this new `Visit` is correct Run the test and check that it passes.

write an error scenario which checks that a reason has been provided:

Pet_bookVisit_IntegTest.java

@Test
public void reason_is_required() {

    // given
    Pet somePet = fakeDataService.enums().anyOf(Pet_persona.class)
                    .findUsing(serviceRegistry);
    List<Visit> before = visitRepository.findByPetOrderByVisitAtDesc(somePet);

    // when, then
    LocalDateTime visitAt = clockService.getClock().nowAsLocalDateTime()
                                .plusDays(fakeDataService.ints().between(1, 3));

    assertThatThrownBy(() ->
        wrapMixin(Pet_bookVisit.class, somePet).act(visitAt, null)
    )
    .isInstanceOf(InvalidException.class)
    .hasMessage("'Reason' is mandatory");
}

write an error scenario which checks that the visitAt date cannot be in the past:

Pet_bookVisit_IntegTest.java

@Test
public void cannot_book_in_the_past() {

    // given
    Pet somePet = fakeDataService.enums().anyOf(Pet_persona.class)
            .findUsing(serviceRegistry);
    List<Visit> before = visitRepository.findByPetOrderByVisitAtDesc(somePet);

    // when, then
    LocalDateTime visitAt = clockService.getClock().nowAsLocalDateTime();
    String reason = fakeDataService.strings().upper(40);

    assertThatThrownBy(() ->
            wrapMixin(Pet_bookVisit.class, somePet).act(visitAt, reason)
    )
            .isInstanceOf(InvalidException.class)
            .hasMessage("Must be in the future");
}