Joseph Doherty
80 lines
3.1 KiB
C#
80 lines
3.1 KiB
C#
using System.Net;
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using Microsoft.AspNetCore.Mvc.Testing;
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using Microsoft.Extensions.Configuration;
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namespace ZB.MOM.WW.ScadaBridge.Host.Tests;
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/// <summary>
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/// Observability adoption: verifies the shared ZB.MOM.WW.Telemetry Prometheus
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/// scrape endpoint (<c>/metrics</c>, mounted by <c>app.MapZbMetrics()</c>) is wired into the
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/// Central composition root. <c>AddZbTelemetry</c> (registered in
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/// <see cref="SiteServiceRegistration.BindSharedOptions"/>) always wires the Prometheus
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/// exporter, so the endpoint returns the Prometheus exposition format regardless of DB /
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/// cluster state. This is a pure route assertion — it requires no database, LDAP, or formed
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/// Akka cluster. The Central-role factory bootstrap mirrors <see cref="HealthCheckTests"/>.
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/// </summary>
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public class MetricsEndpointTests : IDisposable
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{
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private readonly List<IDisposable> _disposables = new();
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public MetricsEndpointTests()
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{
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// Host-003: connection strings are externalised; supply them via env vars.
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_disposables.Add(new CentralDbTestEnvironment());
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}
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public void Dispose()
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{
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foreach (var d in _disposables)
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{
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try { d.Dispose(); } catch { /* best effort */ }
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}
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}
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private WebApplicationFactory<Program> CreateCentralFactory()
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{
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var factory = new WebApplicationFactory<Program>()
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.WithWebHostBuilder(builder =>
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{
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builder.ConfigureAppConfiguration((context, config) =>
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{
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config.AddInMemoryCollection(new Dictionary<string, string?>
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{
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["ScadaBridge:Node:NodeHostname"] = "localhost",
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["ScadaBridge:Node:RemotingPort"] = "0",
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["ScadaBridge:Cluster:SeedNodes:0"] = "akka.tcp://scadabridge@localhost:2551",
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["ScadaBridge:Cluster:SeedNodes:1"] = "akka.tcp://scadabridge@localhost:2552",
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["ScadaBridge:Database:SkipMigrations"] = "true",
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});
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});
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builder.UseSetting("ScadaBridge:Node:Role", "Central");
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builder.UseSetting("ScadaBridge:Database:SkipMigrations", "true");
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});
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_disposables.Add(factory);
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return factory;
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}
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[Fact]
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public async Task Metrics_Endpoint_IsMapped()
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{
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var previousEnv = Environment.GetEnvironmentVariable("DOTNET_ENVIRONMENT");
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try
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{
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Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", "Central");
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var factory = CreateCentralFactory();
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var client = factory.CreateClient();
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_disposables.Add(client);
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var response = await client.GetAsync("/metrics");
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Assert.Equal(HttpStatusCode.OK, response.StatusCode);
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var body = await response.Content.ReadAsStringAsync();
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Assert.Contains("# ", body); // Prometheus exposition (HELP/TYPE comments)
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}
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finally
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{
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Environment.SetEnvironmentVariable("DOTNET_ENVIRONMENT", previousEnv);
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}
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}
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}
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