Path select selects nothing

[LorenzoSantoro94]

Description

Path select (eg .select('path.to.prop')) doesn't select anything even if property exists

Steps to reproduce

Application:

db.collection('collection').select('b.c').get()

Test:

mockFirebase({
  database: {
    collection: [{
      a: true,
      b: {
        c: true
      }
    }]
  }
})

Expected result

Query should return {b: {c: true}}

Actual result

Actually returns an empty object