Complete the test files preliminarily.

lib/ndef.dart

@@ -38,7 +38,7 @@ List<NDEFRecord> decodeRawNdefMessage(Uint8List data,
 /// This is most useful in mobile environment because the APIs will give you these information in a separate manner.
 NDEFRecord decodePartialNdefMessage(
     TypeNameFormat tnf, Uint8List type, Uint8List payload,
-    {required Uint8List id}) {
+    {Uint8List? id}) {
   var decoded = NDEFRecord.doDecode(tnf, type, payload, id: id);
   return decoded;
 }

lib/utilities.dart

@@ -77,12 +77,12 @@ class ByteUtils {
   }
 
   static Uint8List hexStringToBytes(String hex) {
-    // Delete blank space
+    // if there are some blank space in ${hex}, this will delete blank space in it.
     hex = hex.splitMapJoin(" ", onMatch: (Match match) {
       return "";
     });
     if (hex.length % 2 != 0) {
-      throw "Hex string length must be even integer, got ${hex.length}";
+      throw ArgumentError("Hex string length must be even integer, got ${hex.length}");
     }
     var result = <int>[];
     for (int i = 0; i < hex.length; i += 2) {

test/common.dart

@@ -0,0 +1,23 @@
+import 'dart:convert';
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:ndef/ndef.dart';
+import 'package:ndef/utilities.dart';
+
+void testParse(List<String> hexStrings, List<List<NDEFRecord>> messages) {
+  for (int i = 0; i < hexStrings.length; i++) {
+    List<NDEFRecord> decoded = decodeRawNdefMessage(hexStrings[i].toBytes());
+    assert(decoded.length == messages[i].length);
+    for (int j = 0; j < decoded.length; j++) {
+      assert(decoded[j].isEqual(messages[i][j]));
+    }
+  }
+}
+
+void testGenerate(List<String> hexStrings, List<List<NDEFRecord>> messages) {
+  for (int i = 0; i < hexStrings.length; i++) {
+    assert(encodeNdefMessage(messages[i]).toHexString() == hexStrings[i]);
+  }
+}

test/records/bluetooth_test.dart

@@ -0,0 +1,30 @@
+import 'dart:typed_data';
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:ndef/record.dart';
+import 'package:ndef/record/bluetooth.dart';
+
+import '../common.dart';
+
+void main() {
+  group('decode and encode', () {
+    test('bluetooth record', () {
+      List<String> hexStrings = [
+        "d2200b6170706c69636174696f6e2f766e642e626c7565746f6f74682e65702e6f6f620b0006050403020102ff61",
+      ];
+
+      List<List<NDEFRecord>> messages = [
+        [
+          BluetoothEasyPairingRecord(
+              address: EPAddress(address: "06:05:04:03:02:01"),
+              attributes: {
+                EIRType.ManufacturerSpecificData: Uint8List.fromList([97])
+              })
+        ],
+      ];
+
+      testParse(hexStrings, messages);
+      testGenerate(hexStrings, messages);
+    });
+  });
+}