Some fixes, deps, add unit test

GitOrigin-RevId: 7b8749fd29f85657fb3d888a67fb6a3b1336df7b

Author: kiryldz

gradle/dependencies.gradle

@@ -12,7 +12,7 @@ ext {
   // Release Train depends on these two lines below
   // https://github.com/mapbox/release-train/blob/bd530da200d62fb45166ef91d7d892d90a453fa6/backend/model/step/navcoreandroid/PrepareChangelogNavCore.py#L122-L124
 
-  def mapboxSdkVersionSuffix = '21.4-SNAPSHOT-05-13--15-17.git-4af3b28'
+  def mapboxSdkVersionSuffix = '21.5'
   def mapboxNavigatorVersion = "324.${mapboxSdkVersionSuffix}"
 
   def ndkVersionSuffix = ""