Store: add databaseVersion getter

Author: greenrobot-team

objectbox/lib/src/native/store.dart

@@ -498,6 +498,13 @@ class Store implements Finalizable {
         detach: this, externalSize: 200 * 1024);
   }
 
+  /// Returns the version and features of the platform-specific ObjectBox
+  /// database library.
+  ///
+  /// The format may change in any future release, only use this for
+  /// informational purposes.
+  static String databaseVersion() => dartStringFromC(C.version_core_string());
+
   /// Returns if an open store (i.e. opened before and not yet closed) was found
   /// for the given [directoryPath].
   ///

objectbox_test/test/basics_test.dart

@@ -1,6 +1,7 @@
 import 'dart:ffi' as ffi;
 
 import 'package:objectbox/internal.dart';
+import 'package:objectbox/objectbox.dart';
 import 'package:objectbox/src/native/bindings/bindings.dart';
 import 'package:objectbox/src/native/bindings/helpers.dart';
 import 'package:objectbox/src/native/version.dart';
@@ -14,7 +15,8 @@ void main() {
     expect(atLeastDart("999.0.0"), false);
   });
 
-  print("Testing basics of ObjectBox using C lib V${libraryVersion()}");
+  print("Testing basics of ObjectBox using C lib V${libraryVersion()} "
+      "with database version ${Store.databaseVersion()}");
 
   // Prior to Dart 2.6, the exception wasn't accessible and may have crashed.
   // Similarly, this occured in Fluter for Linux (desktop).