GitHub Grails Config Exception snippet

MyClassSpec.groovy

package mypackage

import grails.test.mixin.TestFor
import grails.test.mixin.TestMixin
import grails.test.mixin.support.GrailsUnitTestMixin
import spock.lang.*

/**
 * See the API for {@link grails.test.mixin.support.GrailsUnitTestMixin} for usage instructions
 */
@TestFor(mypackage.MyClass)
class MyClassSpec extends Specification {

    def setup() {
    }

    def cleanup() {
    }

    void "test myMethod method"() {
        given:"list "
            def myClassInstance = new MyClass()
            def listOfmaps = [
                    [
                            "a": [
                                    
                                    "id": 12345,
                                    "field":"bla"
                            ],
                            "b": "path",
                            "c": 1
                    ],
                    [
                            "a": [
                                    
                                    "id": 54321,
                                    "field":"blur"
                                    
                            ],
                            "b": "path",
                            "c": null
                    ] ]
        when: "Call myMethod on it"
            def result = myClassInstance.toTsv(listOfMaps)
        then: "result is list of three strings and each has 11 tab separated values"
            result.size() == 3 
            result[0].split("\t").size() == 10 
            result[1].split("\t").size() == 10


    }
}