Issue simolus3#210 Add timestamp to BlockInformation (simolus3#241)

* Issue simolus3#210 Add timestamp to BlockInformation

* Change timestamp to DateTime

* Add test for Issue simolus3#210

Author: alexeyinkin

lib/src/core/block_information.dart

@@ -2,16 +2,25 @@ import 'package:web3dart/src/crypto/formatting.dart';
 import 'package:web3dart/web3dart.dart';
 
 class BlockInformation {
-  EtherAmount? baseFeePerGas;
+  final EtherAmount? baseFeePerGas;
+  final DateTime timestamp;
 
-  BlockInformation({this.baseFeePerGas});
+  BlockInformation({
+    required this.baseFeePerGas,
+    required this.timestamp,
+  });
 
   factory BlockInformation.fromJson(Map<String, dynamic> json) {
     return BlockInformation(
-        baseFeePerGas: json.containsKey('baseFeePerGas')
-            ? EtherAmount.fromUnitAndValue(
-                EtherUnit.wei, hexToInt(json['baseFeePerGas'] as String))
-            : null);
+      baseFeePerGas: json.containsKey('baseFeePerGas')
+          ? EtherAmount.fromUnitAndValue(
+              EtherUnit.wei, hexToInt(json['baseFeePerGas'] as String))
+          : null,
+      timestamp: DateTime.fromMillisecondsSinceEpoch(
+        hexToDartInt(json['timestamp'] as String) * 1000,
+        isUtc: true,
+      ),
+    );
   }
 
   bool get isSupportEIP1559 => baseFeePerGas != null;

test/infura_integration_test.dart

@@ -35,6 +35,21 @@ void main() {
         expect(balance >= BigInt.parse('410243042034234643784017156276017'),
             isTrue);
       });
+
+      test('Web3Client.getBlockInformation', () async {
+        final blockInfo = await client.getBlockInformation(
+          blockNumber: const BlockNum.exact(14074702).toBlockParam(),
+        );
+
+        expect(
+          blockInfo.timestamp.millisecondsSinceEpoch == 1643113026000,
+          isTrue,
+        );
+        expect(
+          blockInfo.timestamp.isUtc == true,
+          isTrue,
+        );
+      });
     },
     skip: infuraProjectId == null || infuraProjectId.length < 32
         ? 'Tests require the INFURA_ID environment variable'