Package spock.lang

Class Specification

  • All Implemented Interfaces:
    MockFactory
    @Testable
public abstract class Specification
extends MockingApi
    Base class for Spock specifications. All specifications must inherit from this class, either directly or indirectly.

    • Field Detail

      • _

        public static final Object _
        The wildcard symbol. Used in several places as a don't care value:
        • Mock interactions
          • Example: 1 * foo.bar(_)
        • Data parameterizations
          • Example: [foo, _] << loadDataFromDb()

    • Constructor Detail

      • Specification

        public Specification()

    • Method Detail

      • thrown

        public <T extends Throwable> T thrown()
        Specifies that the preceding when block should throw an exception. May only occur as the initializer expression of a typed variable declaration in a then block; the expected exception type is inferred from the variable type.

        This form of exception condition is typically used if the thrown exception instance is used in subsequent conditions.

        Example: 

         when:
 "".charAt(0)

 then:
 IndexOutOfBoundsException e = thrown()
 e.message.contains(...)
        Returns:
        the thrown exception instance

      • thrown

        public <T extends Throwable> T thrown​(Class<T> type)
        Specifies that the preceding when block should throw an exception of the given type. May only occur in a then block.

        This form of exception condition is typically used if the thrown exception instance is not used in subsequent conditions.

        Example: 

         when:
 "".charAt(0)

 then:
 thrown(IndexOutOfBoundsException)
        Type Parameters:
        T - the expected exception type
        Parameters:
        type - the expected exception type
        Returns:
        the thrown exception instance

      • notThrown

        public void notThrown​(Class<? extends Throwable> type)
        Specifies that no exception of the given type should be thrown, failing with a UnallowedExceptionThrownError otherwise.
        Parameters:
        type - the exception type that should not be thrown

      • noExceptionThrown

        public void noExceptionThrown()
        Specifies that no exception should be thrown, failing with a UnallowedExceptionThrownError otherwise.

      • old

        public <T> T old​(T expression)
        Used in a then-block to access an expression's value at the time just before the previous where-block was entered.
        Type Parameters:
        T - the expression's type
        Parameters:
        expression - an arbitrary expression, except that it may not reference variables defined in the then-block
        Returns:
        the expression's value at the time the previous where-block was entered

      • with

        @Beta
public <U> void with​(U target,
                     @DelegatesTo(strategy=1)
                     Closure<?> closure)
        Sets the specified object as the implicit target of the top-level conditions and/or interactions contained in the specified code block, thereby avoiding the need to repeat the same expression multiple times. Implicit conditions are supported. (In other words, the assert keyword may be omitted.) If the target is null, a SpockAssertionError is thrown.

        A with block can be used anywhere in a spec, including nested positions and helper methods.

        Condition example: 

         def fred = new Person(name: "Fred", age: 42)
 def spaceship = new Spaceship(pilot: fred)

 expect:
 with(spaceship.pilot) {
   name == "Fred" // shorthand for: spaceship.pilot.name == "Fred"
   age == 42
 }

        Interaction example: 

         def service = Mock(Service) // has start(), stop(), and doWork() methods
 def app = new Application(service) // controls the lifecycle of the service

 when:
 app.run()

 then:
 with(service) {
   1 * start() // shorthand for: 1 * service.start()
   1 * doWork()
   1 * stop()
 }
        Type Parameters:
        U - type of target
        Parameters:
        target - an implicit target for conditions and/or interactions
        closure - a code block containing top-level conditions and/or interactions

      • with

        @Beta
public <U> void with​(Object target,
                     Class<U> type,
                     @DelegatesTo(genericTypeIndex=0,strategy=1)
                     Closure closure)
        Same as with(Object, groovy.lang.Closure), except that it also states that the specified target has the specified type, throwing a SpockAssertionError otherwise. As a side effect, this may give better code completion in IDEs.

        Example: 

         def fred = new Employee(name: "Fred", age: 42, employer: "MarsTravelUnited")
 def spaceship = new Spaceship(pilot: fred)

 expect:
 with(spaceship.pilot, Employee) {
   name == "Fred" // shorthand for: spaceship.pilot.name == "Fred"
   age == 42
   employer == "MarsTravelUnited"
 }
        Type Parameters:
        U - type of target
        Parameters:
        target - an implicit target for conditions and/or interactions
        type - the expected type of the target
        closure - a code block containing top-level conditions and/or interactions

      • verifyAll

        @Beta
public void verifyAll​(Closure closure)
        All assertions in this block are executed and the errors recorded and reported at the end.

        Example: 

         expect:
 verifyAll {
   1 == 2
   2 == 3
 }
        This will report two errors, instead of just the first.
        Parameters:
        closure - a code block containing top-level conditions and/or interactions

      • verifyAll

        @Beta
public <U> void verifyAll​(U target,
                          @DelegatesTo(strategy=1)
                          Closure<?> closure)
        A combination of with(Object, Closure) and verifyAll(Closure).
        Type Parameters:
        U - type of target
        Parameters:
        target - an implicit target for conditions and/or interactions
        closure - a code block containing top-level conditions and/or interactions
        Since:
        1.2