Initial commit.

PerfectNumbers.Core.Tests/MersenneNumberTester/MersenneNumberTesterTests.cs

@@ -0,0 +1,36 @@
+using FluentAssertions;
+using Xunit;
+
+namespace PerfectNumbers.Core.Tests;
+
+[Collection("GpuNtt")]
+[Trait("Category", "Fast")]
+public class MersenneNumberTesterTests
+{
+    [Theory]
+    [InlineData(136_000_002UL)]
+    [InlineData(136_000_005UL)]
+    public void IsMersennePrime_detects_small_prime_divisors_for_large_exponents(ulong p)
+    {
+        var tester = new MersenneNumberTester();
+        tester.IsMersennePrime(p).Should().BeFalse();
+    }
+
+    [Theory]
+    [InlineData(125UL)]
+    public void WarmUpOrders_populates_cache_without_affecting_results(ulong p)
+    {
+        var tester = new MersenneNumberTester(useOrderCache: true, useGpuOrder: true);
+        tester.WarmUpOrders(p, 1_000UL);
+        tester.IsMersennePrime(p).Should().BeFalse();
+    }
+
+    [Theory]
+    [InlineData(125UL, true)]
+    [InlineData(127UL, false)]
+    public void SharesFactorWithExponentMinusOne_detects_common_factors(ulong p, bool expected)
+    {
+        p.SharesFactorWithExponentMinusOne().Should().Be(expected);
+    }
+}
+

PerfectNumbers.Core.Tests/MersenneNumberTester/MersenneResidueModeTests.cs

@@ -0,0 +1,16 @@
+using FluentAssertions;
+using Xunit;
+
+namespace PerfectNumbers.Core.Tests;
+
+[Trait("Category", "Fast")]
+public class MersenneResidueModeTests
+{
+    [Fact]
+    public void IsMersennePrime_residue_mode_rejects_composite_exponent()
+    {
+        var tester = new MersenneNumberTester(useResidue: true, useIncremental: false);
+        tester.IsMersennePrime(136_000_002UL).Should().BeFalse();
+    }
+}
+