feat(batch10): task4 wire ocsp cache load save and server lifecycle

dotnet/tests/ZB.MOM.NatsNet.Server.Tests/Auth/OcspResponseCacheTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0
 
 using Shouldly;
+using System.Text.Json;
 using ZB.MOM.NatsNet.Server.Auth.CertificateIdentityProvider;
 using ZB.MOM.NatsNet.Server.Auth.Ocsp;
 
@@ -92,6 +93,84 @@ public sealed class OcspResponseCacheTests
         decompressed.ShouldBe(payload);
     }
 
+    [Fact]
+    public void LocalDirCache_LoadCache_MissingFile_LeavesCacheEmpty()
+    {
+        var dir = CreateTempDir();
+        try
+        {
+            var cache = new LocalDirCache(dir);
+            var server = NewServer(new ServerOptions { NoSystemAccount = true });
+
+            cache.LoadCache(server);
+            cache.Start();
+
+            var stats = cache.Stats();
+            stats.ShouldNotBeNull();
+            stats.Responses.ShouldBe(0);
+        }
+        finally
+        {
+            Directory.Delete(dir, recursive: true);
+        }
+    }
+
+    [Fact]
+    public void LocalDirCache_LoadCache_ValidFile_PopulatesCache()
+    {
+        var dir = CreateTempDir();
+        try
+        {
+            var cache = new LocalDirCache(dir);
+            var cacheFile = Path.Combine(dir, "cache.json");
+            var seed = new Dictionary<string, OcspResponseCacheItem>
+            {
+                ["k1"] = new()
+                {
+                    Subject = "subj",
+                    CachedAt = DateTime.UtcNow,
+                    RespStatus = OcspStatusAssertion.Good,
+                    RespExpires = DateTime.UtcNow.AddMinutes(5),
+                    Resp = cache.Compress([1, 2, 3]).compressed!,
+                },
+            };
+
+            File.WriteAllBytes(cacheFile, JsonSerializer.SerializeToUtf8Bytes(seed));
+
+            var server = NewServer(new ServerOptions { NoSystemAccount = true });
+            cache.LoadCache(server);
+            cache.Start();
+
+            cache.Get("k1").ShouldBe([1, 2, 3]);
+            cache.Stats()!.Responses.ShouldBe(1);
+        }
+        finally
+        {
+            Directory.Delete(dir, recursive: true);
+        }
+    }
+
+    [Fact]
+    public void LocalDirCache_SaveCache_DirtyWritesCacheFile()
+    {
+        var dir = CreateTempDir();
+        try
+        {
+            var cache = new LocalDirCache(dir);
+            var server = NewServer(new ServerOptions { NoSystemAccount = true });
+            cache.Start();
+            cache.Put("k1", CreateResponse(OcspStatusAssertion.Good, [4, 5, 6]), "subj");
+
+            cache.SaveCache(server);
+
+            File.Exists(Path.Combine(dir, "cache.json")).ShouldBeTrue();
+        }
+        finally
+        {
+            Directory.Delete(dir, recursive: true);
+        }
+    }
+
     [Fact]
     public void NoOpCache_LifecycleAndStats_ShouldNoOpSafely()
     {
@@ -122,4 +201,19 @@ public sealed class OcspResponseCacheTests
             NextUpdate = DateTime.UtcNow.AddMinutes(10),
             Raw = raw,
         };
+
+    private static NatsServer NewServer(ServerOptions options)
+    {
+        var (server, err) = NatsServer.NewServer(options);
+        err.ShouldBeNull();
+        server.ShouldNotBeNull();
+        return server!;
+    }
+
+    private static string CreateTempDir()
+    {
+        var dir = Path.Combine(Path.GetTempPath(), "ocsp-cache-" + Path.GetRandomFileName());
+        Directory.CreateDirectory(dir);
+        return dir;
+    }
 }