Android Gradle script in multi-module project

I have a multi-module Android project built by Gradle with the new Android-plugin 0.10+.

All modules are mainly configured from the root project.

I've enable the new code coverage feature. The major problem is that only some modules contain test code and when I enable code coverage on modules that don't contain test code, it fails.

I would like to avoid enabling code-coverage in each module build.gradle file so that when someone add test code in a module that wasn't tested, there is no need to modify the build.gradle.

I ended up with the following code where code coverage is enabled only when the androidTest sourceSet contains at least one .java source file. It works as expected, but I'm wondering if there is a nicer way of doing this.

Here is the relevant portion of the root project build.gradle script:

configure(subprojects.findAll()) {
    if(it.name.equals('MyApp')){
        apply plugin: 'android'
    }else{
        apply plugin: 'android-library'
    }

    android {
        ...
        //my question is really about the follong 4 lines :
        //is there a simpler way to get java source file count in the androidTest sourceSet ?
        def androidTestJavaSourceFileCount = 0
        sourceSets.androidTest.allJava.each {
            androidTestJavaSourceFileCount ++
        }
        println("androidTestJavaSourceFileCount in androidTest for module $project.name : $androidTestJavaSourceFileCount")
        buildTypes {
            debug {
                testCoverageEnabled = androidTestJavaSourceFileCount > 0
            }
        }

        jacoco {
            version = '0.6.2.201302030002'
        }

        sourceSets {
            main {
                manifest.srcFile 'AndroidManifest.xml'
                res.srcDirs = ['res']
                assets.srcDirs = ['assets']
           }
       }
 }