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tests/StellaOps.Router.Gateway.Tests/InMemoryValkeyRateLimitStoreTests.cs

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+using FluentAssertions;
+using StellaOps.Router.Gateway.RateLimit;
+using Xunit;
+
+namespace StellaOps.Router.Gateway.Tests;
+
+public sealed class InMemoryValkeyRateLimitStoreTests
+{
+    [Fact]
+    public async Task IncrementAndCheckAsync_UsesSmallestWindowAsRepresentativeWhenAllowed()
+    {
+        var store = new InMemoryValkeyRateLimitStore();
+        var rules = new[]
+        {
+            new RateLimitRule { PerSeconds = 3600, MaxRequests = 1000 },
+            new RateLimitRule { PerSeconds = 60, MaxRequests = 10 },
+        };
+
+        var result = await store.IncrementAndCheckAsync("svc", rules, CancellationToken.None);
+
+        result.Allowed.Should().BeTrue();
+        result.WindowSeconds.Should().Be(60);
+        result.Limit.Should().Be(10);
+        result.CurrentCount.Should().Be(1);
+        result.RetryAfterSeconds.Should().Be(0);
+    }
+
+    [Fact]
+    public async Task IncrementAndCheckAsync_DeniesWhenLimitExceeded()
+    {
+        var store = new InMemoryValkeyRateLimitStore();
+        var rules = new[]
+        {
+            new RateLimitRule { PerSeconds = 300, MaxRequests = 1 },
+            new RateLimitRule { PerSeconds = 3600, MaxRequests = 1000 },
+        };
+
+        (await store.IncrementAndCheckAsync("svc", rules, CancellationToken.None)).Allowed.Should().BeTrue();
+        var denied = await store.IncrementAndCheckAsync("svc", rules, CancellationToken.None);
+
+        denied.Allowed.Should().BeFalse();
+        denied.WindowSeconds.Should().Be(300);
+        denied.Limit.Should().Be(1);
+        denied.CurrentCount.Should().Be(2);
+        denied.RetryAfterSeconds.Should().BeGreaterThan(0);
+    }
+}
+