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Gameboard.ShogiUI.UnitTests/BoardState/BoardVectorShould.cs

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+using FluentAssertions;
+using Gameboard.ShogiUI.BoardState;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace Gameboard.ShogiUI.UnitTests.BoardState
+{
+  [TestClass]
+  public class BoardVectorShould
+  {
+    [TestMethod]
+    public void BeEqualWhenPropertiesAreEqual()
+    {
+      var a = new BoardVector(3, 2);
+      var b = new BoardVector(3, 2);
+      a.Should().Be(b);
+      a.GetHashCode().Should().Be(b.GetHashCode());
+      (a == b).Should().BeTrue();
+
+      // Properties should not be transitively equal.
+      b = new BoardVector(2, 3);
+      a.Should().NotBe(b);
+      a.GetHashCode().Should().NotBe(b.GetHashCode());
+      (a == b).Should().BeFalse();
+    }
+  }
+}