test: fill up lacking unit test

(cherry picked from commit 7981427)

Libplanet.Net.Tests/Consensus/VoteSetTest.cs

@@ -0,0 +1,75 @@
+using System;
+using Libplanet.Blocks;
+using Libplanet.Consensus;
+using Libplanet.Net.Consensus;
+using Xunit;
+
+namespace Libplanet.Net.Tests.Consensus
+{
+    public class VoteSetTest
+    {
+        [Fact]
+        public void Majority()
+        {
+            var voteSet = new VoteSet(0, 0, VoteFlag.PreCommit, TestUtils.ValidatorSet);
+            Assert.False(voteSet.HasOneThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsMajority());
+            Assert.False(voteSet.TwoThirdsMajority(out var hash0));
+            Assert.Equal(default, hash0);
+
+            var blockHash = new BlockHash(TestUtils.GetRandomBytes(BlockHash.Size));
+            voteSet.AddVote(new VoteMetadata(
+                0,
+                0,
+                blockHash,
+                DateTimeOffset.UtcNow,
+                TestUtils.PrivateKeys[0].PublicKey,
+                VoteFlag.PreCommit).Sign(TestUtils.PrivateKeys[0]));
+            Assert.False(voteSet.HasOneThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsMajority());
+            Assert.False(voteSet.TwoThirdsMajority(out var hash1));
+            Assert.Equal(default, hash1);
+
+            voteSet.AddVote(new VoteMetadata(
+                0,
+                0,
+                blockHash,
+                DateTimeOffset.UtcNow,
+                TestUtils.PrivateKeys[1].PublicKey,
+                VoteFlag.PreCommit).Sign(TestUtils.PrivateKeys[1]));
+            Assert.True(voteSet.HasOneThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsMajority());
+            Assert.False(voteSet.TwoThirdsMajority(out var hash2));
+            Assert.Equal(default, hash2);
+
+            voteSet.AddVote(new VoteMetadata(
+                0,
+                0,
+                new BlockHash(TestUtils.GetRandomBytes(BlockHash.Size)),
+                DateTimeOffset.UtcNow,
+                TestUtils.PrivateKeys[2].PublicKey,
+                VoteFlag.PreCommit).Sign(TestUtils.PrivateKeys[2]));
+            Assert.True(voteSet.HasOneThirdsAny());
+            Assert.True(voteSet.HasTwoThirdsAny());
+            Assert.False(voteSet.HasTwoThirdsMajority());
+            Assert.False(voteSet.TwoThirdsMajority(out var hash3));
+            Assert.Equal(default, hash3);
+
+            voteSet.AddVote(new VoteMetadata(
+                0,
+                0,
+                blockHash,
+                DateTimeOffset.UtcNow,
+                TestUtils.PrivateKeys[3].PublicKey,
+                VoteFlag.PreCommit).Sign(TestUtils.PrivateKeys[3]));
+            Assert.True(voteSet.HasOneThirdsAny());
+            Assert.True(voteSet.HasTwoThirdsAny());
+            Assert.True(voteSet.HasTwoThirdsMajority());
+            Assert.True(voteSet.TwoThirdsMajority(out var hash4));
+            Assert.Equal(blockHash, hash4);
+        }
+    }
+}