Fixed tests

test/data/round_test.dart

@@ -8,6 +8,8 @@ void main() {
   const testKamikazePlayerIndex = 1;
   const testScores = [10, 20, 30];
   const testScoreUpdates = [5, 15, 25];
+  const testRoundId = 'testRoundId';
+  const testGameId = 'testGameId';
 
   setUp(() {
     round = Round(
@@ -32,8 +34,8 @@ void main() {
 
     test('Constructor with null kamikazePlayerIndex', () {
       final roundWithoutKamikaze = Round(
-        roundId: 'testRoundId',
-        gameId: 'testGameId',
+        roundId: testRoundId,
+        gameId: testGameId,
         roundNum: testRoundNum,
         caboPlayerIndex: testCaboPlayerIndex,
         kamikazePlayerIndex: null,
@@ -49,6 +51,8 @@ void main() {
     test('toJson() returns correct map', () {
       final jsonMap = round.toJson();
 
+      expect(jsonMap['roundId'], equals(testRoundId));
+      expect(jsonMap['gameId'], equals(testGameId));
       expect(jsonMap['roundNum'], equals(testRoundNum));
       expect(jsonMap['caboPlayerIndex'], equals(testCaboPlayerIndex));
       expect(jsonMap['kamikazePlayerIndex'], equals(testKamikazePlayerIndex));
@@ -58,6 +62,8 @@ void main() {
 
     test('fromJson() creates correct Round object', () {
       final jsonMap = {
+        'roundId': testRoundId,
+        'gameId': testGameId,
         'roundNum': testRoundNum,
         'caboPlayerIndex': testCaboPlayerIndex,
         'kamikazePlayerIndex': testKamikazePlayerIndex,
@@ -76,6 +82,8 @@ void main() {
 
     test('fromJson() with null kamikazePlayerIndex', () {
       final jsonMap = {
+        'roundId': testRoundId,
+        'gameId': testGameId,
         'roundNum': testRoundNum,
         'caboPlayerIndex': testCaboPlayerIndex,
         'kamikazePlayerIndex': null,