Add GPU divisor tester

PerfectNumbers.Core.Tests/MersenneNumberDivisorGpuTesterTests.cs

@@ -0,0 +1,20 @@
+using FluentAssertions;
+using PerfectNumbers.Core.Gpu;
+using Xunit;
+
+namespace PerfectNumbers.Core.Tests;
+
+public class MersenneNumberDivisorGpuTesterTests
+{
+    [Theory]
+    [InlineData(3UL, 7UL, true)]
+    [InlineData(11UL, 23UL, true)]
+    [InlineData(7UL, 35UL, false)]
+    [InlineData(13UL, 23UL, false)]
+    [Trait("Category", "Fast")]
+    public void IsDivisible_returns_expected(ulong exponent, ulong divisor, bool expected)
+    {
+        var tester = new MersenneNumberDivisorGpuTester();
+        tester.IsDivisible(exponent, divisor).Should().Be(expected);
+    }
+}