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

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+using FluentAssertions;
+using StellaOps.Router.Gateway.RateLimit;
+using Xunit;
+
+namespace StellaOps.Router.Gateway.Tests;
+
+public sealed class RateLimitRouteMatcherTests
+{
+    [Fact]
+    public void TryMatch_ExactBeatsPrefixAndRegex()
+    {
+        var microservice = new MicroserviceLimitsConfig
+        {
+            Routes = new Dictionary<string, RouteLimitsConfig>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["exact"] = new RouteLimitsConfig
+                {
+                    Pattern = "/api/scans",
+                    MatchType = RouteMatchType.Exact,
+                    Rules = [new RateLimitRule { PerSeconds = 10, MaxRequests = 1 }]
+                },
+                ["prefix"] = new RouteLimitsConfig
+                {
+                    Pattern = "/api/scans/*",
+                    MatchType = RouteMatchType.Prefix,
+                    Rules = [new RateLimitRule { PerSeconds = 10, MaxRequests = 1 }]
+                },
+                ["regex"] = new RouteLimitsConfig
+                {
+                    Pattern = "^/api/scans/[a-f0-9-]+$",
+                    MatchType = RouteMatchType.Regex,
+                    Rules = [new RateLimitRule { PerSeconds = 10, MaxRequests = 1 }]
+                },
+            }
+        };
+
+        microservice.Validate("microservice");
+
+        var matcher = new RateLimitRouteMatcher();
+        var match = matcher.TryMatch(microservice, "/api/scans");
+
+        match.Should().NotBeNull();
+        match!.Value.Name.Should().Be("exact");
+    }
+
+    [Fact]
+    public void TryMatch_LongestPrefixWins()
+    {
+        var microservice = new MicroserviceLimitsConfig
+        {
+            Routes = new Dictionary<string, RouteLimitsConfig>(StringComparer.OrdinalIgnoreCase)
+            {
+                ["short"] = new RouteLimitsConfig
+                {
+                    Pattern = "/api/*",
+                    MatchType = RouteMatchType.Prefix,
+                    Rules = [new RateLimitRule { PerSeconds = 10, MaxRequests = 1 }]
+                },
+                ["long"] = new RouteLimitsConfig
+                {
+                    Pattern = "/api/scans/*",
+                    MatchType = RouteMatchType.Prefix,
+                    Rules = [new RateLimitRule { PerSeconds = 10, MaxRequests = 1 }]
+                },
+            }
+        };
+
+        microservice.Validate("microservice");
+
+        var matcher = new RateLimitRouteMatcher();
+        var match = matcher.TryMatch(microservice, "/api/scans/123");
+
+        match.Should().NotBeNull();
+        match!.Value.Name.Should().Be("long");
+    }
+}
+