Groovy/Spock BUG! when passing variable into closure

Question

I have a Spock test of this form:

def "test"() {
    when:
        List result = repo.getSomeData(devices)

    then:
        result.size() == 1
        interaction {
            containsRequiredKeys(result[0].keySet())
        }

    where:
        devices | _
        id1     | "devices provided"
        null    | "no devices provided"
}

When running this I get the following error when compiling:

Error:Groovyc: BUG! exception in phase 'class generation' in source unit 'D:\w\traffic-data-web-service\src\integrationTest\groovy\com\company\project\db\Test.groovy' tried to get a variable with the name result as stack variable, but a variable with this name was not created
at org.codehaus.groovy.classgen.asm.CompileStack.getVariable(CompileStack.java:288)
at org.codehaus.groovy.classgen.asm.ClosureWriter.loadReference(ClosureWriter.java:131)
at org.codehaus.groovy.classgen.asm.ClosureWriter.writeClosure(ClosureWriter.java:106)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitClosureExpression(AsmClassGenerator.java:657)
at org.codehaus.groovy.ast.expr.ClosureExpression.visit(ClosureExpression.java:45)
at org.codehaus.groovy.classgen.asm.CallSiteWriter.makeCallSite(CallSiteWriter.java:303)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCachedCall(InvocationWriter.java:307)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:392)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:104)
at org.codehaus.groovy.classgen.asm.InvocationWriter.makeInvokeMethodCall(InvocationWriter.java:88)
at org.codehaus.groovy.classgen.asm.InvocationWriter.writeInvokeMethod(InvocationWriter.java:459)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodCallExpression(AsmClassGenerator.java:767)
at org.codehaus.groovy.ast.expr.MethodCallExpression.visit(MethodCallExpression.java:66)
at org.codehaus.groovy.classgen.asm.StatementWriter.writeExpressionStatement(StatementWriter.java:607)
at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeExpressionStatement(OptimizingStatementWriter.java:357)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitExpressionStatement(AsmClassGenerator.java:620)
at org.codehaus.groovy.ast.stmt.ExpressionStatement.visit(ExpressionStatement.java:42)
at org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:84)
at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeBlockStatement(OptimizingStatementWriter.java:158)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:566)
at org.codehaus.groovy.ast.stmt.BlockStatement.visit(BlockStatement.java:71)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClassCodeContainer(ClassCodeVisitorSupport.java:104)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitConstructorOrMethod(ClassCodeVisitorSupport.java:115)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:430)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:387)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitMethod(ClassCodeVisitorSupport.java:126)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:507)
at org.codehaus.groovy.ast.ClassNode.visitContents(ClassNode.java:1086)
at org.codehaus.groovy.ast.ClassCodeVisitorSupport.visitClass(ClassCodeVisitorSupport.java:53)
at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:233)
at org.codehaus.groovy.control.CompilationUnit$16.call(CompilationUnit.java:813)
at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1055)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:591)
at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:569)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:546)
at org.jetbrains.groovy.compiler.rt.GroovyCompilerWrapper.compile(GroovyCompilerWrapper.java:62)
at org.jetbrains.groovy.compiler.rt.DependentGroovycRunner.runGroovyc(DependentGroovycRunner.java:115)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.jetbrains.groovy.compiler.rt.GroovycRunner.intMain2(GroovycRunner.java:134)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.jetbrains.jps.incremental.groovy.InProcessGroovyc.runGroovycInThisProcess(InProcessGroovyc.java:156)
at org.jetbrains.jps.incremental.groovy.InProcessGroovyc.access$000(InProcessGroovyc.java:51)
at org.jetbrains.jps.incremental.groovy.InProcessGroovyc$1.call(InProcessGroovyc.java:85)
at org.jetbrains.jps.incremental.groovy.InProcessGroovyc$1.call(InProcessGroovyc.java:82)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)

Am I doing something wrong? Or is it an actual bug with Spock or Groovy? If it helps, I've got the following in my build.gradle:

compile "org.codehaus.groovy:groovy-all:2.4.4"
testCompile "org.spockframework:spock-core:1.0-groovy-2.4"
testCompile "org.spockframework:spock-spring:1.0-groovy-2.4"

Answer 1

Your interaction use the variable result. Spock can't match the interaction during the test, because result is initialized after the invocation of repo.getSomedata

under the hood, interaction (mocks) are moved (initialized) before when clauses (where result is undefined)