How to configure device for firebasetest

[liyaka]

Since Pipeline syntax for firebaseTest configuration, I can't find the way to configure a device for the test. Here is my pipeline command:

firebaseTest command: instrumentation(app: "myApp.apk",
                                        test: "myTestApp.apk",
                                        device: [ "model=Nexus5,version=23,locale=en,orientation=portrait" ],
                                        directoriesToPull: "/sdcard/Download/report",
                                        resultsHistoryName: "${env.JOB_NAME}_${env.BUILD_NUMBER}"),
                            gcloud: "/usr/bin/gcloud",
                            resultsDir: 'firebase_results'

and I get this error:

java.lang.ClassCastException: class com.simple.jenkins.firebase.AdHocCommand.setDevice() expects class com.simple.jenkins.firebase.AndroidDevice but received class java.lang.String

What is the right format for setting the device?