diff --git a/X10D.Tests/src/Time/TimeSpanParserTests.cs b/X10D.Tests/src/Time/TimeSpanParserTests.cs
index 04149c5..f1ba85c 100644
--- a/X10D.Tests/src/Time/TimeSpanParserTests.cs
+++ b/X10D.Tests/src/Time/TimeSpanParserTests.cs
@@ -22,6 +22,38 @@ public class TimeSpanParserTests
         Assert.AreEqual(default, timeSpan);
     }
 
+    [TestMethod]
+    public void TryParse_ShouldReturnFalse_GivenEmptySpan()
+    {
+        bool result = TimeSpanParser.TryParse(ReadOnlySpan<char>.Empty, out TimeSpan timeSpan);
+        Assert.IsFalse(result);
+        Assert.AreEqual(default, timeSpan);
+    }
+
+    [TestMethod]
+    public void TryParse_ShouldReturnFalse_GivenWhiteSpaceSpan()
+    {
+        bool result = TimeSpanParser.TryParse("   ".AsSpan(), out TimeSpan timeSpan);
+        Assert.IsFalse(result);
+        Assert.AreEqual(default, timeSpan);
+    }
+
+    [TestMethod]
+    public void TryParse_ShouldReturnFalse_GivenEmptyString()
+    {
+        bool result = TimeSpanParser.TryParse(string.Empty, out TimeSpan timeSpan);
+        Assert.IsFalse(result);
+        Assert.AreEqual(default, timeSpan);
+    }
+
+    [TestMethod]
+    public void TryParse_ShouldReturnFalse_GivenWhiteSpaceString()
+    {
+        bool result = TimeSpanParser.TryParse("   ", out TimeSpan timeSpan);
+        Assert.IsFalse(result);
+        Assert.AreEqual(default, timeSpan);
+    }
+
     [TestMethod]
     public void TryParse_ShouldReturnFalse_GivenNull()
     {