Merge pull request #40 from mlemanczyk/codex/expand-tests-for-mersennenumberresiduegputester

Expand GPU coverage for even perfect candidate tests

PerfectNumbers.Core.Tests/MersenneNumberResidueCpuTesterTests.cs

@@ -21,6 +21,18 @@ public class MersenneNumberResidueCpuTesterTests
         RunCase(tester, 127UL, 1_000UL, expectedPrime: true);
     }
 
+    [Fact]
+    [Trait("Category", "Fast")]
+    public void Scan_recognizes_all_known_small_mersenne_primes()
+    {
+        var tester = new MersenneNumberResidueCpuTester();
+
+        foreach (ulong exponent in MersennePrimeTestData.Exponents)
+        {
+            RunCase(tester, exponent, 1UL, expectedPrime: true);
+        }
+    }
+
     private static void RunCase(MersenneNumberResidueCpuTester tester, ulong exponent, ulong maxK, bool expectedPrime)
     {
         bool isPrime = true;

PerfectNumbers.Core.Tests/MersenneNumberResidueGpuTesterTests.cs

@@ -25,6 +25,20 @@ public class MersenneNumberResidueGpuTesterTests
         RunCase(tester, 127UL, 1_001UL, expectedPrime: true);
     }
 
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    [Trait("Category", "Fast")]
+    public void Scan_recognizes_all_known_small_mersenne_primes(bool useGpuOrder)
+    {
+        var tester = new MersenneNumberResidueGpuTester(useGpuOrder);
+
+        foreach (ulong exponent in MersennePrimeTestData.Exponents)
+        {
+            RunCase(tester, exponent, 1UL, expectedPrime: true);
+        }
+    }
+
     [Theory]
     [InlineData(false)]
     [InlineData(true)]

PerfectNumbers.Core.Tests/MersennePrimeTestData.cs

@@ -0,0 +1,25 @@
+namespace PerfectNumbers.Core.Tests;
+
+internal static class MersennePrimeTestData
+{
+    public static readonly ulong[] Exponents =
+    {
+        31UL,
+        61UL,
+        89UL,
+        107UL,
+        127UL,
+        521UL,
+        607UL,
+        1279UL,
+        2203UL,
+        2281UL,
+        3217UL,
+        4253UL,
+        4423UL,
+        9689UL,
+        9941UL,
+        11213UL
+    };
+}
+