Spock the enterprise ready specifiation framework - Ted Vinke

Spock
Spock
the enterprise ready speciﬁcation framework
Ted Vinke, 2018

http://spockframework.org/spock/docs/1.1/index.html

• Overview

• Data Driven Testing

• Interaction Based Testing

• Extensions

class MathSpec extends Specification {
void "should find maximum of two numbers"() {
when:
def x = Math.max(1, 2)
then:
x == 2
}
}

setup:

when:

then:

expect:

cleanup:

where:
Setup

Stimulus

Response

Cleanup
Blocks Phases

setup:
def stack = new Stack()
def elem = "push me"
Setup Blocks

when:
stack.push(elem)
then:
!stack.empty
stack.size() == 1
stack.peek() == elem
Plain boolean conditions
Conditions

when:
stack.push(elem)
then:
!stack.empty
stack.size() == 2
stack.peek() == elem
Plain boolean conditions
Conditions
Condition not satisfied:
stack.size() == 2
| | |
| 1 false
[push me]

when:
stack.pop()
then:
thrown(EmptyStackException)
Exception conditions
Conditions

when:
stack.pop()
then:
def e = thrown(EmptyStackException)
Conditions

when:
stack.pop()
then:
def e = thrown(EmptyStackException)
e.cause == null
Conditions

when:
def x = Math.max(1, 2)
then:
x == 2
Expect Blocks
expect:
Math.max(1, 2) == 2

setup:
def file = new File("/some/path")
file.createNewFile()
// ...
cleanup:
file.delete()
Cleanup Blocks

def "maximum of two numbers"() {
expect:
Math.max(1, 3) == 3
Math.max(7, 4) == 7
Math.max(0, 0) == 0
}
}
The naive way
Data Driven Testing
• Code and data are mixed and cannot
easily be changed independently 
• Data cannot easily be auto-generated or
fetched from external sources 
• In order to exercise the same code
multiple times, it either has to be
duplicated or extracted into a separate
method 
• In case of a failure, it may not be
immediately clear which inputs caused
the failure 
• Exercising the same code multiple times
does not beneﬁt from the same isolation
as executing separate methods does
…has potential drawbacks:

expect:
Math.max(1, 3) == 3
Math.max(7, 4) == 7
Math.max(0, 0) == 0
}
}
Refactored
Data Driven Testing

expect:
}
}
Refactored
Data Driven Testing

def "maximum of two numbers"(int a, int b, int c) {
expect:
}
}
Refactored
Data Driven Testing

expect:
Math.max(a, b) == c
...
}
}
Refactored
Data Driven Testing

expect:
Math.max(a, b) == c
}
}
Data Tables
Data Driven Testing

expect:
Math.max(a, b) == c
where:
a | b | c
1 | 3 | 3
7 | 4 | 7
0 | 0 | 0
}
}
Data Tables
Data Driven Testing

expect:
Math.max(a, b) == c
where:
a | b | c
1 | 3 | 3
7 | 4 | 7
0 | 0 | 0
}
}
Data Tables
Data Driven Testing
method parameters omitted

expect:
Math.max(a, b) == c
where:
a | b || c
1 | 3 || 3
7 | 4 || 7
0 | 0 || 0
}
}
Data Tables
Data Driven Testing
visually seperate inputs and outputs

expect:
Math.max(a, b) == c
where:
a | b || c
1 | 3 || 3
7 | 4 || 7
0 | 0 || 0
}
}
Data Tables with visually seperated inputs and outputs
Data Driven Testing

expect:
Math.max(a, b) == c
where:
a | b || c
1 | 3 || 3
7 | 4 || 7
0 | 0 || 0
}
}
Reporting of failures
Data Driven Testing
maximum of two numbers FAILED
Condition not satisfied:
Math.max(a, b) == c
| | | | |
| 7 4 | 7
42 false

@Unroll
def "maximum of two numbers"()
Data Driven Testing
maximum of two numbers[0] PASSED
maximum of two numbers[1] FAILED
Math.max(a, b) == c
| | | | |
| 7 4 | 7
42 false
maximum of two numbers[2] PASSED

@Unroll
def "maximum of #a and #b is #c"()
Data Driven Testing
maximum of 3 and 5 is 5 PASSED
maximum of 7 and 4 is 7 FAILED
Math.max(a, b) == c
| | | | |
| 7 4 | 7
42 false
maximum of 0 and 0 is 0 PASSED

...
where:
a << [1, 7, 0]
b << [3, 4, 0]
c << [3, 7, 0]
Data pipes
Data Driven Testing
...
where:
a = 3
b = Math.random() * 100
c = a > b ? a : b

@Shared sql = Sql.newInstance("jdbc:h2:mem:", "org.h2.Driver")
expect:
Math.max(a, b) == c
where:
[a, b, c] << sql.rows("select a, b, c from maxdata")
}
Data pipes
Data Driven Testing

interface Subscriber {
void receive(String message)
}
Publishers and subscribers
Interaction Based Testing
class Publisher {
List<Subscriber> subscribers = []
int messageCount = 0
void send(String message){
subscribers*.receive(message)
messageCount++
}
}

class PublisherSpec extends Specification {
Publisher publisher = new Publisher()
}
class Publisher {
List<Subscriber> subscribers = []
int messageCount = 0
void send(String message){
subscribers*.receive(message)
messageCount++
}
}
void receive(String message)
}

}
}

Subscriber subscriber = Mock()
Subscriber subscriber2 = Mock()
}
}
Creating mocks

Subscriber subscriber = Mock()
Subscriber subscriber2 = Mock()
def setup() {
// << is a Groovy shorthand for List.add()
publisher.subscribers << subscriber
publisher.subscribers << subscriber2
}}
}
Injecting mocks

def "should send messages to all subscribers"() {
}
Mocking

when:
publisher.send("hello")
}
Mocking

when:
then:
1 * subscriber.receive("hello")
1 * subscriber2.receive("hello")
}
Mocking

when:
then:
}
Mocking
interactions

1 * subscriber.receive("hello") // exactly one call
0 * subscriber.receive("hello") // zero calls
(1..3) * subscriber.receive("hello") // between one and three calls
(1.._) * subscriber.receive("hello") // at least one call
(_..3) * subscriber.receive("hello") // at most three calls
_ * subscriber.receive("hello") // any number of calls
Cardinality

1 * subscriber.receive("hello") // a call to 'subscriber'
1 * _.receive("hello") // a call to any mock object
Target Constraint

1 * subscriber.receive("hello") // a method named 'receive'
1 * subscriber./r.*e/("hello") // matches regular expression
Method Constraint

1 * subscriber.receive("hello") // an argument equal to the String "hello"
1 * subscriber.receive(!"hello") // an argument unequal to the String "hello"
1 * subscriber.receive() // the empty argument list
1 * subscriber.receive(_) // any single argument (including null)
1 * subscriber.receive(*_) // any argument list (including empty)
1 * subscriber.receive(!null) // any non-null argument
1 * subscriber.receive(_ as String) // any non-null argument that is-a String
1 * subscriber.receive({ it.size() > 3 }) // an argument that satisfies predicate
Argument Constraints

1 * subscriber.receive("hello") // an argument equal to the String "hello"
1 * subscriber.receive(!"hello") // an argument unequal to the String "hello"
1 * subscriber.receive() // the empty argument list
1 * subscriber.receive(_) // any single argument (including null)
1 * subscriber.receive(*_) // any argument list (including empty)
1 * subscriber.receive(!null) // any non-null argument
1 * subscriber.receive(_ as String) // any non-null argument that is-a String
1 * subscriber.receive({ it.size() > 3 }) // an argument that satisfies predicate
Argument Constraints
1 * process.invoke("ls", "-a", _, !null,
{ ["abcdefghiklmnopqrstuwx1"].contains(it) })

1 * subscriber._(*_)
Quiz Based Testing
1 * _

class MySpec extends Specification {
Subscriber subscriber = Mock
def setup() {
1 * subscriber.receive("goodbye")
}
def "test"() {
}
}
Interactions everywhere!
Subscriber subscriber = Mock {
1 * receive("hello")
1 * receive("goodbye")
}
def "test"() {
}
}
Subscriber subscriber = Mock
def "test"() {
with(subscriber) {
1 * receive("hello")
1 * receive("goodbye")
}
}
}

when:
publisher.send("message1")
then:
1 * subscriber.receive("message1")
when:
publisher.send("message2")
then:
1 * subscriber.receive("message2")
Scope of Interactions

Veriﬁcation of Interactions
Too many invocations for:
2 * subscriber.receive(_) (3 invocations)
Matching invocations (ordered by last occurrence):
2 * subscriber.receive("hello") <-- this triggered the error

Veriﬁcation of Interactions
Too few invocations for:
1 * subscriber.receive("hello") (0 invocations)
Unmatched invocations (ordered by similarity):

Stubbing of interactions
String receive(String message)
}
subscriber.receive(_) >> "ok"

Returning values
subscriber.receive("message1") >> "ok"
subscriber.receive("message2") >> "fail"
subscriber.receive(_) >>> ["ok", "error", "error", "ok"]
subscriber.receive(_) >> { String message ->
message.size() > 3 ? "ok" : "fail" }

def subscriber = Stub(Subscriber)
Other kinds of mock objects
Stubs
Spies
def subscriber = Spy(SubscriberImpl, constructorArgs: ["Fred"])

@Ignore
def "my feature"() { ... }
@IgnoreIf({ System.getProperty("os.name").contains("windows") })
def "my feature"() { ... }
@Requires({ os.windows })
class MySpec extends Specification { ... }
Ignoring and requiring
Extensions

@PendingFeature
def "not implemented yet"() { ... }
Pending features
Extensions

@Timeout(5)
def "I fail if I run for more than five seconds"() { ... }
@Timeout(value = 100, unit = TimeUnit.MILLISECONDS)
def "I better be quick" { ... }
Timeouts
Extensions

@Narrative("""
As a user
I want foo
So that bar
""")
@See("http://spockframework.org/spec")
class MySpec {
@Issue("http://my.issues.org/FOO-2")
def "Foo should do bar"() { ... }
}
Documentation
Extensions

def "should send emails to matching users"() {
given:
def user1 = new User(id: 1L, userName: 'user one', email: 'test@user.one')
def user2 = new User(id: 2L, userName: 'user two', email: ‘test@user.two')
def user3 = new User(id: 3L, userName: 'THIRD test user', email: 'test@user.three')
def user4 = new User(id: 4L, userName: 'testing user four', email: 'test@user.four')
def subject = 'some test email subject'
def content = 'some content of the email'
when:
def result = underTest.sendEmailsToUsers(subject, content, 'test')
then: "get users from repository and send email to each matching user"
1 * userRepository.findAll() >> [user1, user2, user3, user4]
1 * emailSender.sendEmail(subject, content, 'test@user.one')
1 * emailSender.sendEmail(subject, content, 'test@user.four')
result == ['test@user.one', 'test@user.four']
}
@Test
public void testSendingEmailsToMatchingUsers() {
//given:
User user1 = new User();
user1.setId(1L);
user1.setUserName("test user one");
user1.setEmail("test@user.one");
user2.setId(2L);
user2.setUserName("test user two");
user2.setEmail("test@user.two");
user3.setId(3L);
user3.setUserName("THIRD test user");
user3.setEmail("test@user.three");
user4.setId(4L);
user4.setUserName("testing user four");
user4.setEmail("test@user.four");
String subject = "some test email subject";
String content = "some content of the email";
when(userRepository.findAll()).thenReturn(Arrays.asList(user1, user2, user3, user4));
//when:
List<String> result = underTest.sendEmailsToUsers(subject, content, "test");
//then:
Assert.assertEquals(Arrays.asList("test@user.one", "test@user.four"), result);
verify(userRepository).findAll();
}
Mockito vs Spock

Spock the enterprise ready specifiation framework - Ted Vinke

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