Saving Data on Android

Tes/ng the security rules
You have already seen a 
Simulator
 window in the Firebase console. This is a nice 
feature that Firestore provides that you can use to test your rules.
Click on the 
Data
 tab, open 
posts
 collection and copy the ID of one post. Go back to 
the 
Rules
 tab and click on the 
Simulator
 to open simulator window.
1. Under the 
Simulation type
 field leave it set to 
get
.
2. Under the 
Location
 field enter the path to the specific post. In my case the path 
looks like this:
posts/0gbGvf23YT2xhRpcMxqt
The 
0gbGvf23YT2xhRpcMxqt
 is the ID of the post. Replace that value with the ID you
Saving Data on Android
Chapter 19: Securing Data in Cloud Firestore
raywenderlich.com
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copied earlier.
Leave the 
Authenticated
 switch in the inactive state.
Now, click the 
Run
 button.  You should see an error message:
Your request didn't succeed because you simulated unauthenticated request.
Now change the 
Authenticated
 switch to active state, leaving the authentication 
fields that appear with their default values, and click 
Run
 again:
Your request is now successful.