Final fixes & additions to unit test suite

QuadrupleLib.Tests/Math/LogarithmTests.cs

@@ -25,6 +25,20 @@ namespace QuadrupleLib.Tests.Math
     public abstract class LogarithmTests<TAccelerator>
         where TAccelerator : IAccelerator
     {
+        [Theory]
+        [InlineData(-0.288)]
+        [InlineData(0.5)]
+        [InlineData(2.0)]
+        [InlineData(-2.0)]
+        [InlineData(-4.65)]
+        public void IsILogBCorrect(double x)
+        {
+            double y = double.Exp2(x);
+
+            int n = (int)System.Math.Floor(x);
+            Assert.Equal(n, Float128<TAccelerator>.ILogB(y));
+        }
+
         [Theory]
         [InlineData(-0.288)]
         [InlineData(0.5)]

QuadrupleLib.Tests/Math/TrigonometryTests.cs

@@ -693,6 +693,17 @@ public void IsAtan2EqualCoRDiC(double thetaDeg)
             Float128<TAccelerator> thetaB = Float128<TAccelerator>.Atan2(sin, cos);
             AssertX.NearlyEqual(thetaA, thetaB, Precision.NearestTenThousandth);
         }
+
+        [Theory]
+        [InlineData(3.0, 4.0)]
+        [InlineData(1.5, 2.0)]
+        [InlineData(1.0, 1.0)]
+        [InlineData(5.6, 7.125)]
+        public void IsHypotCorrect(double a, double b) 
+        {
+            double c = double.Hypot(a, b);
+            AssertX.NearlyEqual(c, Float128<TAccelerator>.Hypot(a, b), Precision.NearestTenThousandth);
+        }
     }
 
     public class TrigonometryTests_DefaultAccelerator :

QuadrupleLib.Tests/Utilities/AcceleratorTests.cs

@@ -1,4 +1,22 @@
-using QuadrupleLib.Accelerators;
+/*
+ *  Copyright 2026 Chosen Few Software
+ *  This file is part of QuadrupleLib.
+ *
+ *  QuadrupleLib is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  QuadrupleLib is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with QuadrupleLib.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+using QuadrupleLib.Accelerators;
 using Xunit;
 
 namespace QuadrupleLib.Tests.Utilities