diff --git a/X10D.Tests/src/Collections/SpanTest.cs b/X10D.Tests/src/Collections/SpanTest.cs
index 41f3809..106bf80 100644
--- a/X10D.Tests/src/Collections/SpanTest.cs
+++ b/X10D.Tests/src/Collections/SpanTest.cs
@@ -6,6 +6,26 @@ namespace X10D.Tests.Collections;
 [TestClass]
 public class SpanTest
 {
+    [TestMethod]
+    public void Count_ShouldReturn0_GivenEmptySpan()
+    {
+        Span<int> span = Span<int>.Empty;
+
+        int count = span.Count(2);
+
+        Assert.AreEqual(0, count);
+    }
+
+    [TestMethod]
+    public void Count_ShouldReturn8_GivenSpanWith8MatchingElements()
+    {
+        Span<int> span = stackalloc int[16] {1, 2, 3, 2, 5, 2, 7, 2, 9, 2, 11, 2, 13, 2, 15, 2};
+
+        int count = span.Count(2);
+
+        Assert.AreEqual(8, count);
+    }
+
     [TestMethod]
     public void Split_OnEmptySpan_ShouldYieldNothing()
     {