diff --git a/X10D.Tests/src/Core/DoubleTests.cs b/X10D.Tests/src/Core/DoubleTests.cs
index a815f42..c421cc5 100644
--- a/X10D.Tests/src/Core/DoubleTests.cs
+++ b/X10D.Tests/src/Core/DoubleTests.cs
@@ -102,4 +102,17 @@ public class DoubleTests
         Assert.AreEqual(5.0, 7.0.Round(5));
         Assert.AreEqual(10.0, 7.5.Round(5));
     }
+
+    [TestMethod]
+    public void Sqrt()
+    {
+        Assert.AreEqual(0.0, 0.0.Sqrt());
+        Assert.AreEqual(1.414213562373095, 2.0.Sqrt());
+        Assert.AreEqual(3.0, 9.0.Sqrt());
+        Assert.AreEqual(4.0, 16.0.Sqrt());
+        Assert.AreEqual(double.NaN, double.NaN.Sqrt());
+        Assert.AreEqual(double.NaN, (-1.0).Sqrt());
+        Assert.AreEqual(double.NaN, double.NegativeInfinity.Sqrt());
+        Assert.AreEqual(double.PositiveInfinity, double.PositiveInfinity.Sqrt());
+    }
 }
diff --git a/X10D.Tests/src/Core/SingleTests.cs b/X10D.Tests/src/Core/SingleTests.cs
index d562e94..212e2e6 100644
--- a/X10D.Tests/src/Core/SingleTests.cs
+++ b/X10D.Tests/src/Core/SingleTests.cs
@@ -26,4 +26,17 @@ public class SingleTests
         Assert.AreEqual(6.0f, 0.10471976f.RadiansToDegrees());
         Assert.AreEqual(12.0f, 0.20943952f.RadiansToDegrees());
     }
+
+    [TestMethod]
+    public void Sqrt()
+    {
+        Assert.AreEqual(0.0f, 0.0f.Sqrt());
+        Assert.AreEqual(1.4142135f, 2.0f.Sqrt());
+        Assert.AreEqual(3.0f, 9.0f.Sqrt());
+        Assert.AreEqual(4.0f, 16.0f.Sqrt());
+        Assert.AreEqual(float.NaN, float.NaN.Sqrt());
+        Assert.AreEqual(float.NaN, (-1.0f).Sqrt());
+        Assert.AreEqual(float.NaN, float.NegativeInfinity.Sqrt());
+        Assert.AreEqual(float.PositiveInfinity, float.PositiveInfinity.Sqrt());
+    }
 }