Initial commit.

PerfectNumbers.Core.Tests/PrimeCacheTests.cs

@@ -0,0 +1,39 @@
+using FluentAssertions;
+using PeterO.Numbers;
+using Xunit;
+
+namespace PerfectNumbers.Core.Tests;
+
+public class PrimeCacheTests
+{
+    [Fact]
+    [Trait("Category", "Fast")]
+    public void GetEulerPrimes_returns_primes_congruent_to_one_mod_four()
+    {
+        var cache = new PrimeCache();
+        EInteger[] result = cache.GetEulerPrimes(EInteger.FromInt32(2), EInteger.FromInt32(20));
+
+        result.Should().Equal(
+            EInteger.FromInt32(5),
+            EInteger.FromInt32(13),
+            EInteger.FromInt32(17));
+    }
+
+    [Fact]
+    [Trait("Category", "Fast")]
+    public void EnumeratePrimes_returns_sequence_starting_from_value()
+    {
+        var cache = new PrimeCache();
+        EInteger[] result = cache.EnumeratePrimes(EInteger.FromInt32(10))
+            .Take(5)
+            .ToArray();
+
+        result.Should().Equal(
+            EInteger.FromInt32(11),
+            EInteger.FromInt32(13),
+            EInteger.FromInt32(17),
+            EInteger.FromInt32(19),
+            EInteger.FromInt32(23));
+    }
+}
+