Running Firestore local e.g. for testing

Question

Is there a way to run firestore locally (e.g. for testing purposes)?

What would the approach to write tests against the DB (except of using mocks)

Answer 1

for a firestore testing write a js example test.js you could test write with this format example

var data = {
        value: {createTime: new Date(),
                updateTime: new Date(),
                fields:{

                        name:{stringValue:'new value data'},
                        age:{integerValue:50}
                      }
        },
        oldValue: {createTime: new Date(),  //old create time
                updateTime: new Date(),  //old update time time
                fields:{

                        name:{stringValue:'olvalue data'},
                        age:{integerValue:50}
                      }
        }
      };
testFireStoreEvent(data);

for run execute

firebase experimental:functions:shell < test.js

UPDATE!!!! VALID FOR WRITE AND UPDATE EVENTS

var data = {
    before: {  
          //your before data

    },
    after: {

        //your after data
     }
  };
testFireStoreEvent(data);