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src/Router/__Tests/StellaOps.Gateway.WebService.Tests/Routing/StellaOpsRouteResolverTests.cs

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+using Microsoft.AspNetCore.Http;
+using StellaOps.Gateway.WebService.Routing;
+using StellaOps.Router.Gateway.Configuration;
+
+namespace StellaOps.Gateway.WebService.Tests.Routing;
+
+public sealed class StellaOpsRouteResolverTests
+{
+    private static StellaOpsRoute MakeRoute(
+        string path,
+        StellaOpsRouteType type = StellaOpsRouteType.Microservice,
+        bool isRegex = false,
+        string? translatesTo = null)
+    {
+        return new StellaOpsRoute
+        {
+            Path = path,
+            Type = type,
+            IsRegex = isRegex,
+            TranslatesTo = translatesTo ?? "http://backend:5000"
+        };
+    }
+
+    [Fact]
+    public void Resolve_ExactPathMatch_ReturnsRoute()
+    {
+        var route = MakeRoute("/dashboard");
+        var resolver = new StellaOpsRouteResolver(new[] { route });
+
+        var result = resolver.Resolve(new PathString("/dashboard"));
+
+        Assert.NotNull(result);
+        Assert.Equal("/dashboard", result.Path);
+    }
+
+    [Fact]
+    public void Resolve_PrefixMatch_ReturnsRoute()
+    {
+        var route = MakeRoute("/app");
+        var resolver = new StellaOpsRouteResolver(new[] { route });
+
+        var result = resolver.Resolve(new PathString("/app/index.html"));
+
+        Assert.NotNull(result);
+        Assert.Equal("/app", result.Path);
+    }
+
+    [Fact]
+    public void Resolve_RegexRoute_Matches()
+    {
+        var route = MakeRoute(@"^/api/v[0-9]+/.*", isRegex: true);
+        var resolver = new StellaOpsRouteResolver(new[] { route });
+
+        var result = resolver.Resolve(new PathString("/api/v2/data"));
+
+        Assert.NotNull(result);
+        Assert.True(result.IsRegex);
+        Assert.Equal(@"^/api/v[0-9]+/.*", result.Path);
+    }
+
+    [Fact]
+    public void Resolve_NoMatch_ReturnsNull()
+    {
+        var route = MakeRoute("/dashboard");
+        var resolver = new StellaOpsRouteResolver(new[] { route });
+
+        var result = resolver.Resolve(new PathString("/unknown"));
+
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void Resolve_FirstMatchWins()
+    {
+        var firstRoute = MakeRoute("/api", translatesTo: "http://first:5000");
+        var secondRoute = MakeRoute("/api", translatesTo: "http://second:5000");
+        var resolver = new StellaOpsRouteResolver(new[] { firstRoute, secondRoute });
+
+        var result = resolver.Resolve(new PathString("/api/resource"));
+
+        Assert.NotNull(result);
+        Assert.Equal("http://first:5000", result.TranslatesTo);
+    }
+
+    [Fact]
+    public void Resolve_NotFoundPageRoute_IsExcluded()
+    {
+        var notFoundRoute = MakeRoute("/not-found", type: StellaOpsRouteType.NotFoundPage);
+        var resolver = new StellaOpsRouteResolver(new[] { notFoundRoute });
+
+        var result = resolver.Resolve(new PathString("/not-found"));
+
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void Resolve_ServerErrorPageRoute_IsExcluded()
+    {
+        var errorRoute = MakeRoute("/error", type: StellaOpsRouteType.ServerErrorPage);
+        var resolver = new StellaOpsRouteResolver(new[] { errorRoute });
+
+        var result = resolver.Resolve(new PathString("/error"));
+
+        Assert.Null(result);
+    }
+
+    [Fact]
+    public void Resolve_CaseInsensitive_Matches()
+    {
+        var route = MakeRoute("/app");
+        var resolver = new StellaOpsRouteResolver(new[] { route });
+
+        var result = resolver.Resolve(new PathString("/APP"));
+
+        Assert.NotNull(result);
+        Assert.Equal("/app", result.Path);
+    }
+
+    [Fact]
+    public void Resolve_EmptyRoutes_ReturnsNull()
+    {
+        var resolver = new StellaOpsRouteResolver(Array.Empty<StellaOpsRoute>());
+
+        var result = resolver.Resolve(new PathString("/anything"));
+
+        Assert.Null(result);
+    }
+}