test: bench inserts

mobile-v2/test/test_utils.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:immich_mobile/domain/entities/asset_isar.entity.dart';
+import 'package:isar/isar.dart';
+
+abstract final class TestUtils {
+  const TestUtils._();
+
+  /// Downloads Isar binaries (if required) and initializes a new Isar db
+  static Future<Isar> initIsar() async {
+    await Isar.initializeIsarCore(download: true);
+
+    final instance = Isar.getInstance();
+    if (instance != null) {
+      return instance;
+    }
+
+    final db = await Isar.open(
+      [AssetSchema],
+      directory: "test/",
+      maxSizeMiB: 1024,
+      inspector: false,
+    );
+
+    // Clear and close db on test end
+    addTearDown(() async {
+      if (!db.isOpen) {
+        return;
+      }
+      await db.writeTxn(() async => await db.clear());
+      await db.close();
+    });
+    return db;
+  }
+}