Summary

On Android the defined testID property on a Marker gets lost. It is not visible as the accessibility (or any other) identifier. On iOS it works as expected.
Looks like, when adding testID for Marker, the Android part was missed (see PR https://github.com/react-native-maps/react-native-maps/pull/2253/files)

Reproducible sample code

import React from 'react';
import MapView, {Marker} from 'react-native-maps';

const locations = [
  {
    latitude: 49.2988199,
    longitude: 8.6490136,
  },
  {
    latitude: 49.293936,
    longitude: 8.674228,
  },
];

const Maps = () => (
  <MapView
    style={{flex: 1}}
    initialRegion={{
      latitude: 51.58453765908476,
      latitudeDelta: 12.60450692544972,
      longitude: 10.199171528220177,
      longitudeDelta: 10.48278160393238,
    }}>
    {locations.map((l, i) => (
      <Marker key={i} coordinate={l} testID="marker" />
    ))}
  </MapView>
);

export default Maps;

Steps to reproduce

1. Add testID to the Marker element
2. Use it in the sample app
3. Load this app to Android device (or use Android studio)
4. Check testID presence

NOTE: The same steps on iOS leads to testID displaying

Expected result

testID displayed in properties

Actual result

testID absent in properties

React Native Maps Version

1.4.0

What platforms are you seeing the problem on?

Android

React Native Version

0.69.7

What version of Expo are you using?

Not using Expo

Device(s)

Samsung Galaxy S20

Additional information

No response