How to spy Java File with Spock 0.7?

[Marcin Gryszko]

I'm not able to spy java.io.File. Following spec (working in Groovy console) demonstrates the exception I'm getting. It seems that the class to spyt must have a default constructor, does it?

@Grab('org.spockframework:spock-core:0.7-groovy-2.0')

import spock.lang.Specification

class FileSpySpec extends Specification {

    def setup() {

        GroovySpy(File, global: true)

    }

    

    def 'file spy'() { 

        expect: true         

    }

}

Runtime exception:

org.spockframework.mock.CannotCreateMockException: Cannot create mock for class java.io.Filenull

at org.spockframework.mock.runtime.MockInstantiator.instantiate(MockInstantiator.java:38)

at org.spockframework.mock.runtime.GroovyMockFactory.create(GroovyMockFactory.java:54)

at org.spockframework.mock.runtime.CompositeMockFactory.create(CompositeMockFactory.java:44)

at org.spockframework.lang.SpecInternals.createMock(SpecInternals.java:47)

at org.spockframework.lang.SpecInternals.createMockImpl(SpecInternals.java:282)

at org.spockframework.lang.SpecInternals.GroovySpyImpl(SpecInternals.java:267)

at FileSpySpec.setup(spec.groovy:7)

Caused by: org.codehaus.groovy.runtime.metaclass.MethodSelectionException: Could not find which method <init>() to invoke from this list:

  public java.io.File#<init>(java.net.URI)

  private java.io.File#<init>(java.lang.String, int)

  private java.io.File#<init>(java.lang.String, java.io.File)

  public java.io.File#<init>(java.lang.String)

  public java.io.File#<init>(java.lang.String, java.lang.String)

  public java.io.File#<init>(java.io.File, java.lang.String)

at org.spockframework.mock.runtime.GroovyRealMethodInvoker.respond(GroovyRealMethodInvoker.java:34)

at org.spockframework.mock.runtime.MockInvocation.callRealMethod(MockInvocation.java:60)

at org.spockframework.mock.CallRealMethodResponse.respond(CallRealMethodResponse.java:29)

at org.spockframework.mock.runtime.MockController.handle(MockController.java:49)

at org.spockframework.mock.runtime.GroovyMockMetaClass.doInvokeMethod(GroovyMockMetaClass.java:104)

at org.spockframework.mock.runtime.GroovyMockMetaClass.invokeConstructor(GroovyMockMetaClass.java:50)

at org.spockframework.mock.runtime.MockInstantiator.instantiate(MockInstantiator.java:33)

Cheers,

Marcin

[Lari Hotari]

Here's a working example:
https://github.com/lhotari/filespy-spock-example/blob/master/src/test/groovy/FileSpySpec.groovy

running the example:
git clone https://github.com/lhotari/filespy-spock-example
cd filespy-spock-example
gradle test

requires these dependencies:
    testCompile 'cglib:cglib-nodep:2.2.2', 'org.objenesis:objenesis:1.3'

With Objenesis and Cglib on the class path, you add the GroovySpy like this:
        GroovySpy(File, global: true, useObjenesis: true)

For some reason I couldn't get these dependencies to work properly with @Grab.


This example doesn't work:

@Grab('org.spockframework:spock-core:0.7-groovy-2.0')

@Grab('org.objenesis:objenesis:1.3')
@Grab('cglib:cglib-nodep:2.2.2')

import spock.lang.Specification

class FileSpySpec extends Specification {

    def 'file spy example' () {
        given:
        def mockFile = Mock(File)
        GroovySpy(File, global: true, useObjenesis: true)
        when:
        def file = new File('testdir', 'testfile')
        file.delete()
        then :
        1 * new File('testdir','testfile') >> { mockFile }
        1 * mockFile.delete()
    }
}

results in

java.lang.IllegalAccessError: org/spockframework/compiler/InteractionRewriter$InteractionResponse
    at org.spockframework.compiler.InteractionRewriter.parseResults(InteractionRewriter.java:100)
    at org.spockframework.compiler.InteractionRewriter.isInteraction(InteractionRewriter.java:87)
    at org.spockframework.compiler.InteractionRewriter.rewrite(InteractionRewriter.java:70)
    at org.spockframework.compiler.DeepBlockRewriter.handleInteraction(DeepBlockRewriter.java:97)
    at org.spockframework.compiler.DeepBlockRewriter.doVisitExpressionStatement(DeepBlockRewriter.java:63)
    at org.spockframework.compiler.AbstractDeepBlockRewriter.visitExpressionStatement(AbstractDeepBlockRewriter.java:87)
    at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:40)

The same code example works in the gradle build ( https://github.com/lhotari/filespy-spock-example)

Lari

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[Peter Niederwieser]

`useObjenesis = true` shouldn't be needed. If you want a constructor other than the default constructor to be used, you need to provide the constructor arguments. See http://docs.spockframework.org/en/latest/interaction_based_testing.html#spies for details.

Cheers,

Peter

[Marcin Gryszko]

Peter,

as far as I understood you, you provider constructor arguments to create a spy instance. However, I want to spy construction of an object that doesn't provide a default constructor (and I'm not able to add it).

My quick workaround was to use newInstance class method and use old Grails mocks to mock the call.

Marcin Gryszko