mdtest/examples/shared-counter/shared_counter_test/shared_counter.spec

{
  "devices": {
    "Alice": {
      "app-root": "../plus",
      "app-path": "test_driver/plus_inst.dart"
    },
    "Bob": {
      "app-root": "../minus",
      "app-path": "test_driver/minus_inst.dart"
    }
  }
}