The document discusses testing with Spock, a Groovy-based testing framework. It provides examples of different Spock features like BDD-style tests using Given-When-Then, data-driven testing with the @Unroll annotation, mocking, and sharing test state between specifications using the @Shared annotation or setupSpec method. It also covers Spock's integration with JUnit and how to write Spock tests that are compatible with both JUnit 4 and JUnit 5.

1. 23 September 2021
The Groovy Way of Testing
with Spock
Naresha K
@naresha_k
https://blog.nareshak.com/

2. About me
Developer, Architect &
Tech Excellence Coach
Founder & Organiser
Bangalore Groovy User
Group

4. Intention Conveying

5. import org.junit.jupiter.api.DisplayName;
import org.junit.jupiter.api.Test;
import static org.assertj.core.api.Assertions.assertThat;
public class SampleJupiterTest {
@Test
@DisplayName("This test should pass if project is setup properly")
public void thisTestShouldPassIfProjectIsSetupProperly() {
assertThat(true).isTrue();
}
}

6. https://martinfowler.com/bliki/BeckDesignRules.html

7. import spock.lang.Specification
class SampleSpecification extends Specification {
void "This test should pass if project is setup properly"() {
expect:
true
}
}

8. BDD Style
Given - When - Then

9. def “files added to a bucket are available in the bucket”() {
given:
def filePath = Paths.get("src/test/resources/car.jpg")
InputStream stream = Files.newInputStream(filePath)
when:
fileStorageService.storeFile(TARGET_BUCKET, "vehicles/123.jpg", stream)
then:
amazonS3Service.exists(TARGET_BUCKET, "vehicles/123.jpg")
}

10. def "file can be stored in s3 storage and read"() {
given:
def filePath = Paths.get("src/test/resources/car.jpg")
InputStream stream = Files.newInputStream(filePath)
when:
fileStorageService.storeFile(TARGET_BUCKET, "vehicles/123.jpg", stream)
then:
amazonS3Service.exists(TARGET_BUCKET, "vehicles/123.jpg")
when:
File file = fileStorageService.readFile(TARGET_BUCKET, "vehicles/123.jpg",
Files.createTempFile(null, null).toAbsolutePath().toString())
then:
file
and:
file.newInputStream().bytes
=
=
filePath.bytes
}

11. Power Asserts

12. void "list assertion example"() {
given:
List<Integer> numbers = [1, 2, 3]
when:
/
/
List<Integer> result = numbers.collect { it * 2}
List<Integer> result = [2, 2, 6]
then:
result
=
=
[2, 4, 6]
}
Condition not satis
fi
ed:
result == [2, 4, 6]
| |
| false
[2, 2, 6]

13. void "list contains expected element"() {
expect:
10 in [2, 4, 6]
}
Condition not satis
fi
ed:
10 in [2, 4, 6]
|
false

14. void "assert all"() {
expect:
verifyAll {
10 in [2, 4, 6]
12 in [2, 4, 6]
}
}
Multiple Failures (2 failures)
org.spockframework.runtime.ConditionNotSatis
fi
edError: Condition not satis
fi
ed:
10 in [2, 4, 6]
|
false
org.spockframework.runtime.ConditionNotSatis
fi
edError: Condition not satis
fi
ed:
12 in [2, 4, 6]
|
false

15. void "assert object by extracting field"() {
when:
List<Person> authors = [new Person(firstName: 'James', lastName: 'Gosling'),
new Person(firstName: 'Kent', lastName: 'Beck')]
then:
authors*.lastName
=
=
['Gosling', 'Beck ']
}
Condition not satis
fi
ed:
authors*.lastName == ['Gosling', 'Beck ']
| | |
| | false
| [Gosling, Beck]
[Person(James, Gosling), Person(Kent, Beck)]

16. void "assert with containsAll"() {
when:
List<Integer> numbers = [2, 4, 6]
then:
numbers.containsAll([10, 12])
}
Condition not satis
fi
ed:
numbers.containsAll([10, 12])
| |
| false
[2, 4, 6]

17. Data-Driven Testing

18. @Unroll
void "#a + #b should be #expectedSum"() {
when:
def sum = a + b
then:
sum
=
=
expectedSum
where:
a | b | expectedSum
10 | 10 | 20
20 | 20 | 40
}

19. Ordered Execution of Tests

20. @Stepwise
class OrderedSpecification extends Specification {
void "test 1"() {
expect:
true
}
void "test 2"() {
expect:
true
}
void "test 3"() {
expect:
true
}
}

21. @Stepwise
class OrderedSpecification extends Specification {
void "test 1"() {
expect:
true
}
void "test 2"() {
expect:
false
}
void "test 3"() {
expect:
true
}
}

22. Mocking

23. @Canonical
class TalkPopularityService {
AudienceCountService audienceCountService
public boolean isPopularTalk(String talk) {
def count = audienceCountService.getAudienceCount(talk)
count > 100 ? true : false
}
}
interface AudienceCountService {
int getAudienceCount(String talk)
}

24. class TalkPopularityServiceSpec extends Specification {
private AudienceCountService audienceCountService = Mock()
private TalkPopularityService talkPopularityService =
new TalkPopularityService(audienceCountService)
void "when audience count is 200 talk should be considered popular"() {
given:
String talk = "Whats new in Groovy 4"
when:
boolean isPopular = talkPopularityService.isPopularTalk(talk)
then:
isPopular
=
=
true
and:
1 * audienceCountService.getAudienceCount(talk)
>
>
200
}
void "when audience count is 90 talk should be considered not popular"() {
given:
String talk = "Some talk"
when:
boolean isPopular = talkPopularityService.isPopularTalk(talk)
then:
isPopular
=
=
false
and:
1 * audienceCountService.getAudienceCount(talk)
>
>
90
}
}

25. Spock 1.x - JUnit 4 Compatibility
https://github.com/naresha/junitspock

26. public class Sputnik extends Runner
implements Filterable, Sortable {
/
/
code
}

27. Spock - JUnit 5 Compatibility

28. public class SpockEngine extends HierarchicalTestEngine<SpockExecutionContext> {
@Override
public String getId() {
return "spock";
}
/
/
more code
}

29. @Shared

30. public class SampleTest {
private StateHolder stateHolder = new StateHolder();
@Test
void test1() {
/
/
use stateHolder
}
@Test
void test2() {
/
/
use stateHodler
}
}
public class StateHolder {
public StateHolder() {
System.out.println("Instantiating StateHolder");
}
}

31. public class SampleTest {
private StateHolder stateHolder = new StateHolder();
@Test
void test1() {
/
/
use stateHolder
}
@Test
void test2() {
/
/
use stateHodler
}
}
public class StateHolder {
public StateHolder() {
System.out.println("Instantiating StateHolder");
}
}
@BeforeEach
private void setup() {
stateHolder = new StateHolder();
}

32. public class SampleSharedStateTest {
private StateHolder stateHolder;
@BeforeAll
void beforeAll() {
stateHolder = new StateHolder();
}
@Test
void test1() {
/
/
use shared stateHolder
System.out.println(stateHolder);
}
@Test
void test2() {
/
/
use shared stateHodler
System.out.println(stateHolder);
}
}

33. public class SampleSharedStateTest {
private StateHolder stateHolder;
@BeforeAll
void beforeAll() {
stateHolder = new StateHolder();
}
@Test
void test1() {
/
/
use shared stateHolder
System.out.println(stateHolder);
}
@Test
void test2() {
/
/
use shared stateHodler
System.out.println(stateHolder);
}
}
@BeforeAll method 'void
com.nareshak.demo.SampleSharedStateTest.beforeAll()'
must be static unless the test class is annotated with
@TestInstance(Lifecycle.PER_CLASS).

34. public class SampleSharedStateTest {
private static StateHolder stateHolder;
@BeforeAll
static void beforeAll() {
stateHolder = new StateHolder();
}
@Test
void test1() {
/
/
use shared stateHolder
System.out.println(stateHolder);
}
@Test
void test2() {
/
/
use shared stateHodler
System.out.println(stateHolder);
}
}
Instantiating StateHolder
com.nareshak.demo.StateHolder@5bea6e0
com.nareshak.demo.StateHolder@5bea6e0

35. class SharedStateSpec extends Specification{
@Shared
private StateHolder stateHolder = new StateHolder()
void "spec 1"() {
println stateHolder
expect:
true
}
void "spec 2"() {
println stateHolder
expect:
true
}
}
com.nareshak.demo.StateHolder@53708326
com.nareshak.demo.StateHolder@53708326

36. class SharedStateSpec extends Specification{
@Shared
private StateHolder stateHolder = new StateHolder()
void "spec 1"() {
println stateHolder
expect:
true
}
void "spec 2"() {
println stateHolder
expect:
true
}
}
com.nareshak.demo.StateHolder@53708326
com.nareshak.demo.StateHolder@53708326
@Shared
private StateHolder stateHolder
void setupSpec() {
stateHolder = new StateHolder()
}

37. And
The most important Reason
???

39. https://github.com/naresha/apachecon2021spock

40. Thank You