fix: clarify VoteId collision errors and stabilize time-based tests

Author: jason-aelf

contract/AElf.Contracts.Vote/VoteContract.cs

@@ -108,9 +108,9 @@ public override Empty Vote(VoteInput input)
         if (existingRecord != null)
         {
             Assert(input.IsChangeTarget, "VoteId already exists.");
-            Assert(existingRecord.IsWithdrawn, "VoteId already exists.");
-            Assert(existingRecord.VotingItemId == input.VotingItemId, "VoteId already exists.");
-            Assert(existingRecord.Voter == input.Voter, "VoteId already exists.");
+            Assert(existingRecord.IsWithdrawn, "VoteId already exists and not withdrawn.");
+            Assert(existingRecord.VotingItemId == input.VotingItemId, "VoteId belongs to a different voting item.");
+            Assert(existingRecord.Voter == input.Voter, "VoteId belongs to a different voter.");
         }
 
         var votingRecord = new VotingRecord

test/AElf.Contracts.Election.Tests/BVT/ElectionTests.cs

@@ -1301,9 +1301,10 @@ public async Task ElectionContract_Withdraw_Succeeds_When_Delegated_VoteId_Colli
         recordAfterRejectedCollision.Option.ShouldBe(candidatePubkey);
         recordAfterRejectedCollision.IsWithdrawn.ShouldBeFalse();
 
-        BlockTimeProvider.SetBlockTime(recordAfterRejectedCollision.VoteTimestamp.AddSeconds(lockTime + 1));
+        BlockTimeProvider.SetBlockTime(recordAfterRejectedCollision.VoteTimestamp.AddSeconds(lockTime + 1000));
 
         var withdrawResult = await WithdrawVotes(voterKeyPair, voteId);
+        withdrawResult.Error.ShouldBeEmpty();
         withdrawResult.Status.ShouldBe(TransactionResultStatus.Mined);
 
         var electorVote = await ElectionContractStub.GetElectorVoteWithAllRecords.CallAsync(new StringValue

test/AElf.Contracts.Profit.Tests/ProfitTests.cs

@@ -2,6 +2,8 @@
 using System.Threading.Tasks;
 using AElf.Contracts.MultiToken;
 using AElf.CSharp.Core;
+using AElf.CSharp.Core.Extension;
+using AElf.Kernel;
 using AElf.Types;
 using Google.Protobuf.WellKnownTypes;
 using Shouldly;
@@ -1950,7 +1952,7 @@ await TokenContractStub.Create.SendAsync(new CreateInput
                     { "__seed_owned_symbol", symbol },
                     {
                         "__seed_exp_time",
-                        Timestamp.FromDateTime(global::System.DateTime.UtcNow.AddDays(1)).Seconds.ToString()
+                        TimestampHelper.GetUtcNow().AddHours(1).Seconds.ToString()
                     }
                 }
             },