busterTest will fail when buster.js contains more than one configuration.(gradle-buster-plugin)

build.gradle

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
       // buster.js
        classpath  'org.gradle.buster:gradle-buster-plugin:0.2.4.1' // 0.2.4.2 is not available yet.
    }
}

//apply plugin: 'com.github.rundis.buster' // this is for 0.2.4.2
apply plugin: 'buster'

buster {
  port =  0
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.0'
}

buster.js

var config = module.exports;

config["config 0"] = {
	environment: "browser",
	rootPath: ".",
	tests: []	
} 

config["config 1"] = {
	extends: "config 0",
	tests: [
		"src/test/js/*.js"
	]
};

// for testing purpose we simply copy the first config.
config["config 2"] = {
	extends: "config 0",
	tests: [
		"src/test/js/*.js"
	]
};

simpleSuite.js

buster.testCase("Simple suite", {
	'will assert true': function() {
		buster.assert(true);
	}
});

Just put "simpleSuite.js" int src/test/js/ and run
gradle wrapper
./gradlew busterTest