Android Robospock Have

AndroidRobospockHack.groovy

ext {
  groovyVersion = '2.3.3'
  spockVersion = '0.7-groovy-2.0'
  roboSpockVersion = '0.4.4'
  sdkDir = project(project.ext.robospock).android.sdkDirectory
}

buildscript {
  repositories {
    mavenLocal()
    mavenCentral()
  }
  dependencies {
    classpath "org.robospock:robospock-plugin:0.4.0"
  }
}

repositories {
  mavenCentral()
  //Again the robospock-plugin does not add all the correct android dependencies
  maven { url "${sdkDir}/extras/android/m2repository" }
  maven { url "${sdkDir}/extras/google/m2repository" }
}

apply plugin: 'groovy'

dependencies {
  compile "org.codehaus.groovy:groovy-all:$groovyVersion"
  compile "org.spockframework:spock-core:$spockVersion"
  compile "org.robospock:robospock:$roboSpockVersion"
}

// Disable the default test task otherwise commandline build fails because
// gradle test task tries to run the specs as if they were standard spock tests
test.onlyIf { false }

/**
 * The findCompileDependencies method of the org.robospock:robospock-plugin does not work with the
 * latest gradle and android build tools.
 * Consider fixing the plugin and submitting
 */
org.robospock.RobospockAction.metaClass.findCompileDependencies = { Project androidProject ->
  androidProject.configurations.all.find {
    it.name == 'compile'
  }.getAllDependencies()
}

/**
 * The findCompileDependencies execute of the org.robospock:robospock-plugin does not take into account
 * that the generated variants and placed in the 'generated' directory.
 * Consider fixing the plugin and submitting
 */
org.robospock.RobospockAction.metaClass.execute = { Project project ->
  def androidProject = project.project(project.ext.robospock)

  // collect and extract compiled classes in library project
  def subprojects = getSubprojects(androidProject)

  // collect and forward all maven dependencies
  def allprojects = subprojects + androidProject
  def mavenDependencies = collectMavenDependencies(allprojects)

  mavenDependencies.each { dep ->
    project.dependencies {
      compile group: dep.group, name: dep.name, version: dep.version
    }
  }

  def allSourceSets = ['src/main/java']
  def allResourcesSets = ['src/main/res']

  allSourceSets.addAll(androidProject.android.sourceSets.main.java.srcDirs)
  allResourcesSets.add(androidProject.android.sourceSets.main.res)

  def testableVariant = androidProject.android.applicationVariants.find { variant ->
    variant.name == 'devDebug'
  }
  ["r/", "buildConfig/"].each {
    allSourceSets.add(androidProject.buildDir.path + "/generated/source/" + it + testableVariant.dirName)
  }

  project.sourceSets.main {
    java.srcDirs = allSourceSets
    resources.srcDirs = allResourcesSets
  }

  Test test = project.tasks.create(org.robospock.RobospockAction.ROBOSPOCK_TASK_NAME, Test.class);
  project.getTasks().getByName(JavaBasePlugin.CHECK_TASK_NAME).dependsOn(test);
  test.setDescription("Runs the unit tests using Robospock.")
  test.setGroup(JavaBasePlugin.VERIFICATION_GROUP)

  test.workingDir = "${androidProject.projectDir}/src/main"
  test.dependsOn(androidProject.getTasks().findByName('assembleDevDebug'))
}

//Plugin must be applied last and must use qualified name when applied from a gradle script
apply plugin: org.robospock.RobospockPlugin

Hi.
Using your script I am getting this error while accessing testableVariant.dirName

Error:(97, 0) Cannot get property 'dirName' on null object

Can you give me a hint whats wrong with my setup?
Thanks!

Just replace "devDebug" and "DevDebug" with "debug" and "Debug" respectively. I didn't have the "devDebug" variant, so using the debug one worked fine.