diff --git a/X10D.Tests/src/Core/DoubleTests.cs b/X10D.Tests/src/Core/DoubleTests.cs
index c421cc5..d0bedcf 100644
--- a/X10D.Tests/src/Core/DoubleTests.cs
+++ b/X10D.Tests/src/Core/DoubleTests.cs
@@ -1,4 +1,5 @@
 using System.Diagnostics;
+using System.Numerics;
 
 namespace X10D.Tests.Core;
 
@@ -11,6 +12,22 @@ using Microsoft.VisualStudio.TestTools.UnitTesting;
 [TestClass]
 public class DoubleTests
 {
+    [TestMethod]
+    public void ComplexSqrt()
+    {
+        Assert.AreEqual(0.0, 0.0.ComplexSqrt());
+        Assert.AreEqual(1.414213562373095, 2.0.ComplexSqrt());
+        Assert.AreEqual(3.0, 9.0.ComplexSqrt());
+        Assert.AreEqual(4.0, 16.0.ComplexSqrt());
+        Assert.AreEqual(new Complex(1.414213562373095, 1), (-2.0).ComplexSqrt());
+        Assert.AreEqual(new Complex(3.0, 1), (-9.0).ComplexSqrt());
+        Assert.AreEqual(new Complex(4.0, 1), (-16.0).ComplexSqrt());
+        Assert.AreEqual(Complex.NaN, double.NaN.ComplexSqrt());
+        Assert.AreEqual(new Complex(1, 1), (-1.0).ComplexSqrt());
+        Assert.AreEqual(Complex.Infinity, double.NegativeInfinity.ComplexSqrt());
+        Assert.AreEqual(Complex.Infinity, double.PositiveInfinity.ComplexSqrt());
+    }
+    
     /// <summary>
     ///     Test for <see cref="DoubleExtensions.LerpTo" />
     /// </summary>
diff --git a/X10D.Tests/src/Core/SingleTests.cs b/X10D.Tests/src/Core/SingleTests.cs
index 212e2e6..87db537 100644
--- a/X10D.Tests/src/Core/SingleTests.cs
+++ b/X10D.Tests/src/Core/SingleTests.cs
@@ -1,10 +1,27 @@
-using Microsoft.VisualStudio.TestTools.UnitTesting;
+using System.Numerics;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
 
 namespace X10D.Tests.Core;
 
 [TestClass]
 public class SingleTests
 {
+    [TestMethod]
+    public void ComplexSqrt()
+    {
+        Assert.AreEqual(0.0f, 0.0f.ComplexSqrt());
+        Assert.AreEqual(1.4142135f, 2.0f.ComplexSqrt());
+        Assert.AreEqual(3.0f, 9.0f.ComplexSqrt());
+        Assert.AreEqual(4.0f, 16.0f.ComplexSqrt());
+        Assert.AreEqual(new Complex(1.4142135f, 1), (-2.0f).ComplexSqrt());
+        Assert.AreEqual(new Complex(3.0f, 1), (-9.0f).ComplexSqrt());
+        Assert.AreEqual(new Complex(4.0f, 1), (-16.0f).ComplexSqrt());
+        Assert.AreEqual(Complex.NaN, float.NaN.ComplexSqrt());
+        Assert.AreEqual(new Complex(1, 1), (-1.0f).ComplexSqrt());
+        Assert.AreEqual(Complex.Infinity, float.NegativeInfinity.ComplexSqrt());
+        Assert.AreEqual(Complex.Infinity, float.PositiveInfinity.ComplexSqrt());
+    }
+
     [TestMethod]
     public void DegreesToRadians()
     {