Files
natsdotnet/docs/plans/2026-03-12-test-project-split-plan.md
Joseph Doherty fb19b50231 docs: add implementation plan for test project split
13 tasks: create TestUtilities, extract 9 subsystem test projects,
rename remainder to Core.Tests, final verification.
2026-03-12 14:26:58 -04:00

23 KiB

Test Project Split Implementation Plan

For Claude: REQUIRED SUB-SKILL: Use superpowers-extended-cc:executing-plans to implement this plan task-by-task.

Goal: Split the monolithic NATS.Server.Tests (609 files) into 10 feature-focused test projects + 1 shared test utilities library.

Architecture: Create NATS.Server.TestUtilities as a class library with deduplicated helpers and shared fixtures. Then extract test files into subsystem-specific test projects one at a time, smallest first. Each extraction creates a new .csproj, moves files with git mv, updates namespaces, adds to the solution, and verifies build+test before proceeding to the next.

Tech Stack: .NET 10, xUnit 3, Shouldly, NSubstitute, Central Package Management


Task 0: Create NATS.Server.TestUtilities project

Files:

  • Create: tests/NATS.Server.TestUtilities/NATS.Server.TestUtilities.csproj
  • Create: tests/NATS.Server.TestUtilities/TestPortAllocator.cs
  • Create: tests/NATS.Server.TestUtilities/SocketTestHelper.cs
  • Modify: tests/NATS.Server.Tests/NATS.Server.Tests.csproj (add ProjectReference)
  • Modify: NatsDotNet.slnx (add project)

Step 1: Create the TestUtilities csproj

<!-- tests/NATS.Server.TestUtilities/NATS.Server.TestUtilities.csproj -->
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="NATS.Client.Core" />
    <PackageReference Include="NATS.NKeys" />
    <PackageReference Include="Shouldly" />
    <PackageReference Include="xunit" />
  </ItemGroup>

  <ItemGroup>
    <None Update="TestData\**\*" CopyToOutputDirectory="PreserveNewest" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\src\NATS.Server\NATS.Server.csproj" />
  </ItemGroup>
</Project>

Step 2: Create TestPortAllocator.cs

// tests/NATS.Server.TestUtilities/TestPortAllocator.cs
using System.Net;
using System.Net.Sockets;

namespace NATS.Server.TestUtilities;

public static class TestPortAllocator
{
    public static int GetFreePort()
    {
        using var sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
        sock.Bind(new IPEndPoint(IPAddress.Loopback, 0));
        return ((IPEndPoint)sock.LocalEndPoint!).Port;
    }
}

Step 3: Create SocketTestHelper.cs

// tests/NATS.Server.TestUtilities/SocketTestHelper.cs
using System.Net.Sockets;
using System.Text;

namespace NATS.Server.TestUtilities;

public static class SocketTestHelper
{
    public static async Task<string> ReadUntilAsync(Socket sock, string expected, int timeoutMs = 5000)
    {
        using var cts = new CancellationTokenSource(timeoutMs);
        var sb = new StringBuilder();
        var buf = new byte[4096];
        while (!sb.ToString().Contains(expected, StringComparison.Ordinal))
        {
            var n = await sock.ReceiveAsync(buf, SocketFlags.None, cts.Token);
            if (n == 0) break;
            sb.Append(Encoding.ASCII.GetString(buf, 0, n));
        }
        return sb.ToString();
    }
}

Step 4: Add ProjectReference to existing NATS.Server.Tests

Add to tests/NATS.Server.Tests/NATS.Server.Tests.csproj inside the <ItemGroup> with ProjectReference:

<ProjectReference Include="..\NATS.Server.TestUtilities\NATS.Server.TestUtilities.csproj" />

Step 5: Add TestUtilities to solution file

In NatsDotNet.slnx, inside <Folder Name="/tests/"> add:

<Project Path="tests/NATS.Server.TestUtilities/NATS.Server.TestUtilities.csproj" />

Step 6: Build to verify

Run: dotnet build Expected: SUCCESS — TestUtilities compiles, NATS.Server.Tests still compiles.

Step 7: Commit

git add tests/NATS.Server.TestUtilities/ NatsDotNet.slnx tests/NATS.Server.Tests/NATS.Server.Tests.csproj
git commit -m "feat: create NATS.Server.TestUtilities with shared helpers"

Task 1: Move shared fixtures and parity utilities to TestUtilities

Files:

  • Move: tests/NATS.Server.Tests/JetStreamApiFixture.cstests/NATS.Server.TestUtilities/JetStreamApiFixture.cs
  • Move: tests/NATS.Server.Tests/JetStream/Cluster/JetStreamClusterFixture.cstests/NATS.Server.TestUtilities/JetStreamClusterFixture.cs
  • Move: tests/NATS.Server.Tests/LeafNodes/LeafFixture.cstests/NATS.Server.TestUtilities/LeafFixture.cs
  • Move: tests/NATS.Server.Tests/Parity/NatsCapabilityInventory.cstests/NATS.Server.TestUtilities/Parity/NatsCapabilityInventory.cs
  • Move: tests/NATS.Server.Tests/Parity/ParityRowInspector.cstests/NATS.Server.TestUtilities/Parity/ParityRowInspector.cs
  • Move: tests/NATS.Server.Tests/Parity/JetStreamParityTruthMatrix.cstests/NATS.Server.TestUtilities/Parity/JetStreamParityTruthMatrix.cs
  • Move: tests/NATS.Server.Tests/TestData/*tests/NATS.Server.TestUtilities/TestData/*

Step 1: Move files with git mv

cd tests
git mv NATS.Server.Tests/JetStreamApiFixture.cs NATS.Server.TestUtilities/
git mv NATS.Server.Tests/JetStream/Cluster/JetStreamClusterFixture.cs NATS.Server.TestUtilities/
git mv NATS.Server.Tests/LeafNodes/LeafFixture.cs NATS.Server.TestUtilities/
mkdir -p NATS.Server.TestUtilities/Parity
git mv NATS.Server.Tests/Parity/NatsCapabilityInventory.cs NATS.Server.TestUtilities/Parity/
git mv NATS.Server.Tests/Parity/ParityRowInspector.cs NATS.Server.TestUtilities/Parity/
git mv NATS.Server.Tests/Parity/JetStreamParityTruthMatrix.cs NATS.Server.TestUtilities/Parity/
mkdir -p NATS.Server.TestUtilities/TestData
git mv NATS.Server.Tests/TestData/* NATS.Server.TestUtilities/TestData/

Step 2: Update namespaces in moved files

Change namespace NATS.Server.Tests;namespace NATS.Server.TestUtilities; in each moved file. For parity files: namespace NATS.Server.TestUtilities.Parity; For fixtures in subfolders that had sub-namespaces (e.g. NATS.Server.Tests.JetStream.Cluster), update to NATS.Server.TestUtilities;.

Step 3: Make fixture classes public

The moved fixtures (JetStreamApiFixture, JetStreamClusterFixture, LeafFixture) are likely internal. Change them to public so test projects can access them.

Step 4: Add using NATS.Server.TestUtilities; to files that reference moved fixtures

All files that reference JetStreamApiFixture, JetStreamClusterFixture, LeafFixture, or parity utilities need the new using directive. This is ~52 files for JetStreamApiFixture, ~20 for cluster fixture, ~5 for LeafFixture.

Step 5: Remove TestData entry from NATS.Server.Tests.csproj

Remove the <None Update="TestData\**\*" ...> item since TestData moved to TestUtilities.

Step 6: Build and run tests

Run: dotnet build && dotnet test tests/NATS.Server.Tests --no-build Expected: All tests pass — fixtures resolved from TestUtilities.

Step 7: Commit

git add -A
git commit -m "refactor: move shared fixtures and parity utilities to TestUtilities"

Task 2: Extract NATS.Server.Transport.Tests (~25 files)

Files:

  • Create: tests/NATS.Server.Transport.Tests/NATS.Server.Transport.Tests.csproj
  • Move: Root files: OcspConfigTests.cs, OcspStaplingTests.cs, TlsConnectionWrapperTests.cs, TlsHelperTests.cs, TlsMapAuthenticatorTests.cs, TlsOcspParityBatch1Tests.cs, TlsOcspParityBatch2Tests.cs, TlsRateLimiterTests.cs, TlsServerTests.cs
  • Move: WebSocket/ folder (15 files)
  • Move: Networking/ folder (1 file)
  • Modify: NatsDotNet.slnx

Step 1: Create the csproj

<!-- tests/NATS.Server.Transport.Tests/NATS.Server.Transport.Tests.csproj -->
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <IsPackable>false</IsPackable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="coverlet.collector" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" />
    <PackageReference Include="NSubstitute" />
    <PackageReference Include="Shouldly" />
    <PackageReference Include="xunit" />
    <PackageReference Include="xunit.runner.visualstudio" />
    <PackageReference Include="Serilog.Sinks.File" />
  </ItemGroup>

  <ItemGroup>
    <Using Include="Xunit" />
    <Using Include="Shouldly" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\src\NATS.Server\NATS.Server.csproj" />
    <ProjectReference Include="..\NATS.Server.TestUtilities\NATS.Server.TestUtilities.csproj" />
  </ItemGroup>
</Project>

Step 2: Move files with git mv

cd tests
mkdir -p NATS.Server.Transport.Tests
git mv NATS.Server.Tests/OcspConfigTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/OcspStaplingTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsConnectionWrapperTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsHelperTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsMapAuthenticatorTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsOcspParityBatch1Tests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsOcspParityBatch2Tests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsRateLimiterTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/TlsServerTests.cs NATS.Server.Transport.Tests/
git mv NATS.Server.Tests/WebSocket NATS.Server.Transport.Tests/WebSocket
git mv NATS.Server.Tests/Networking NATS.Server.Transport.Tests/Networking

Step 3: Update namespaces

In all moved files, change:

  • namespace NATS.Server.Tests;namespace NATS.Server.Transport.Tests;
  • namespace NATS.Server.Tests.WebSocket;namespace NATS.Server.Transport.Tests.WebSocket;
  • namespace NATS.Server.Tests.Networking;namespace NATS.Server.Transport.Tests.Networking;

Step 4: Replace private GetFreePort/ReadUntilAsync with TestUtilities calls

In each moved file that has private static int GetFreePort() or private static async Task<string> ReadUntilAsync(...):

  • Delete the private method
  • Add using NATS.Server.TestUtilities;
  • Replace GetFreePort()TestPortAllocator.GetFreePort()
  • Replace ReadUntilAsync(SocketTestHelper.ReadUntilAsync(

Step 5: Add to solution file

In NatsDotNet.slnx, inside /tests/:

<Project Path="tests/NATS.Server.Transport.Tests/NATS.Server.Transport.Tests.csproj" />

Step 6: Build and test

Run: dotnet build && dotnet test tests/NATS.Server.Transport.Tests --no-build Expected: All Transport tests pass.

Run: dotnet test tests/NATS.Server.Tests --no-build Expected: Remaining tests still pass.

Step 7: Commit

git add -A
git commit -m "refactor: extract NATS.Server.Transport.Tests project"

Task 3: Extract NATS.Server.Mqtt.Tests (~30 files)

Files:

  • Create: tests/NATS.Server.Mqtt.Tests/NATS.Server.Mqtt.Tests.csproj
  • Move: Root file: MqttPersistenceTests.cs
  • Move: Mqtt/ folder (28 files)

Step 1: Create csproj (same template as Transport, no Serilog needed)

Step 2: Move files

cd tests
mkdir -p NATS.Server.Mqtt.Tests
git mv NATS.Server.Tests/MqttPersistenceTests.cs NATS.Server.Mqtt.Tests/
git mv NATS.Server.Tests/Mqtt NATS.Server.Mqtt.Tests/Mqtt

Step 3: Update namespaces

  • namespace NATS.Server.Tests;namespace NATS.Server.Mqtt.Tests;
  • namespace NATS.Server.Tests.Mqtt;namespace NATS.Server.Mqtt.Tests.Mqtt;

Step 4: Replace duplicated helpers with TestUtilities calls (same pattern as Task 2)

Step 5: Add to solution file

Step 6: Build and test

Run: dotnet build && dotnet test tests/NATS.Server.Mqtt.Tests --no-build

Step 7: Commit

git add -A
git commit -m "refactor: extract NATS.Server.Mqtt.Tests project"

Task 4: Extract NATS.Server.Gateways.Tests (~25 files)

Files:

  • Create: tests/NATS.Server.Gateways.Tests/NATS.Server.Gateways.Tests.csproj
  • Move: Root files: GatewayAdvancedRemapRuntimeTests.cs, GatewayAdvancedSemanticsTests.cs, GatewayLeafBootstrapTests.cs, GatewayProtocolTests.cs
  • Move: Gateways/ folder (21 files)

Steps: Same pattern as Tasks 2-3.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.Gateways.Tests;
  • namespace NATS.Server.Tests.Gateways;namespace NATS.Server.Gateways.Tests.Gateways;

May need NATS.Client.Core package if any gateway test uses NatsConnection.

Commit: git commit -m "refactor: extract NATS.Server.Gateways.Tests project"


Task 5: Extract NATS.Server.LeafNodes.Tests (~30 files)

Files:

  • Create: tests/NATS.Server.LeafNodes.Tests/NATS.Server.LeafNodes.Tests.csproj
  • Move: Root files: LeafAdvancedSemanticsTests.cs, LeafProtocolTests.cs
  • Move: LeafNodes/ folder (26 files) — note: LeafFixture.cs already moved to TestUtilities
  • Move: LeafNode/ folder (1 file)

Steps: Same pattern. The LeafFixture reference now comes from TestUtilities — add using NATS.Server.TestUtilities;.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.LeafNodes.Tests;
  • namespace NATS.Server.Tests.LeafNodes;namespace NATS.Server.LeafNodes.Tests.LeafNodes;
  • namespace NATS.Server.Tests.LeafNode;namespace NATS.Server.LeafNodes.Tests.LeafNode;

Commit: git commit -m "refactor: extract NATS.Server.LeafNodes.Tests project"


Task 6: Extract NATS.Server.Clustering.Tests (~30 files)

Files:

  • Create: tests/NATS.Server.Clustering.Tests/NATS.Server.Clustering.Tests.csproj
  • Move: Root files: RouteHandshakeTests.cs, RoutePoolTests.cs, RouteRmsgForwardingTests.cs, RouteSubscriptionPropagationTests.cs, RouteWireSubscriptionProtocolTests.cs, ImplicitDiscoveryTests.cs, InterServerAccountProtocolTests.cs
  • Move: Routes/ folder (21 files)
  • Move: Route/ folder (1 file)

Steps: Same pattern.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.Clustering.Tests;
  • namespace NATS.Server.Tests.Routes;namespace NATS.Server.Clustering.Tests.Routes;
  • namespace NATS.Server.Tests.Route;namespace NATS.Server.Clustering.Tests.Route;

Commit: git commit -m "refactor: extract NATS.Server.Clustering.Tests project"


Task 7: Extract NATS.Server.Raft.Tests (~45 files)

Files:

  • Create: tests/NATS.Server.Raft.Tests/NATS.Server.Raft.Tests.csproj
  • Move: Root files: RaftConsensusAdvancedParityTests.cs, RaftElectionTests.cs, RaftMembershipParityTests.cs, RaftReplicationTests.cs, RaftSafetyContractTests.cs, RaftSnapshotCatchupTests.cs, RaftSnapshotTransferParityTests.cs, RaftTransportPersistenceTests.cs
  • Move: Raft/ folder (36 files)

Steps: Same pattern.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.Raft.Tests;
  • namespace NATS.Server.Tests.Raft;namespace NATS.Server.Raft.Tests.Raft;

Commit: git commit -m "refactor: extract NATS.Server.Raft.Tests project"


Task 8: Extract NATS.Server.Monitoring.Tests (~35 files)

Files:

  • Create: tests/NATS.Server.Monitoring.Tests/NATS.Server.Monitoring.Tests.csproj
  • Move: Root files: EventSystemTests.cs, JszMonitorTests.cs, MonitorClusterEndpointTests.cs, MonitorModelTests.cs, MonitorTests.cs, SubszTests.cs, SystemEventsTests.cs, SystemRequestReplyTests.cs
  • Move: Monitoring/ folder (21 files)
  • Move: Events/ folder (10 files)

Steps: Same pattern. Needs NATS.Client.Core package for integration tests.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.Monitoring.Tests;
  • namespace NATS.Server.Tests.Monitoring;namespace NATS.Server.Monitoring.Tests.Monitoring;
  • namespace NATS.Server.Tests.Events;namespace NATS.Server.Monitoring.Tests.Events;

Commit: git commit -m "refactor: extract NATS.Server.Monitoring.Tests project"


Task 9: Extract NATS.Server.Auth.Tests (~50 files)

Files:

  • Create: tests/NATS.Server.Auth.Tests/NATS.Server.Auth.Tests.csproj
  • Move: Root files: AccountIsolationTests.cs, AccountResolverTests.cs, AccountStatsTests.cs, AccountTests.cs, AuthConfigTests.cs, AuthIntegrationTests.cs, AuthProtocolTests.cs, AuthServiceTests.cs, ClientPermissionsTests.cs, JwtAuthenticatorTests.cs, JwtTests.cs, NKeyAuthenticatorTests.cs, NKeyIntegrationTests.cs, PermissionIntegrationTests.cs, PermissionLruCacheTests.cs, PermissionTemplateTests.cs, SimpleUserPasswordAuthenticatorTests.cs, TokenAuthenticatorTests.cs, UserPasswordAuthenticatorTests.cs, ImportExportTests.cs
  • Move: Auth/ folder (25 files)
  • Move: Accounts/ folder (5 files)

Steps: Same pattern. Needs NATS.NKeys and NATS.Client.Core packages.

Namespace changes:

  • namespace NATS.Server.Tests;namespace NATS.Server.Auth.Tests;
  • namespace NATS.Server.Tests.Auth;namespace NATS.Server.Auth.Tests.Auth;
  • namespace NATS.Server.Tests.Accounts;namespace NATS.Server.Auth.Tests.Accounts;

Commit: git commit -m "refactor: extract NATS.Server.Auth.Tests project"


Task 10: Extract NATS.Server.JetStream.Tests (~220 files)

Files:

  • Create: tests/NATS.Server.JetStream.Tests/NATS.Server.JetStream.Tests.csproj
  • Move: All root JetStream* files (~55 files)
  • Move: Root storage files: FileStoreTests.cs, FileStoreEncryptionTests.cs, MemStoreTests.cs, StreamStoreContractTests.cs, MirrorSourceRetryTests.cs, ClusterJetStreamConfigProcessorTests.cs
  • Move: JetStream/ folder and all sub-folders (163 files) — note: JetStreamClusterFixture.cs already in TestUtilities

Step 1: Create csproj with JetStream-specific additions

<!-- tests/NATS.Server.JetStream.Tests/NATS.Server.JetStream.Tests.csproj -->
<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <IsPackable>false</IsPackable>
    <DefineConstants>$(DefineConstants);JETSTREAM_INTEGRATION_MATRIX</DefineConstants>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="coverlet.collector" />
    <PackageReference Include="Microsoft.NET.Test.Sdk" />
    <PackageReference Include="NATS.Client.Core" />
    <PackageReference Include="NSubstitute" />
    <PackageReference Include="Shouldly" />
    <PackageReference Include="xunit" />
    <PackageReference Include="xunit.runner.visualstudio" />
  </ItemGroup>

  <ItemGroup>
    <Using Include="Xunit" />
    <Using Include="Shouldly" />
  </ItemGroup>

  <ItemGroup>
    <ProjectReference Include="..\..\src\NATS.Server\NATS.Server.csproj" />
    <ProjectReference Include="..\NATS.Server.TestUtilities\NATS.Server.TestUtilities.csproj" />
  </ItemGroup>
</Project>

Step 2: Move files — this is the largest move. Use a script:

cd tests
mkdir -p NATS.Server.JetStream.Tests

# Move JetStream subfolder (preserves internal structure)
git mv NATS.Server.Tests/JetStream NATS.Server.JetStream.Tests/JetStream

# Move root JetStream* files
for f in NATS.Server.Tests/JetStream*.cs; do
  git mv "$f" NATS.Server.JetStream.Tests/
done

# Move storage-related root files
git mv NATS.Server.Tests/FileStoreTests.cs NATS.Server.JetStream.Tests/
git mv NATS.Server.Tests/FileStoreEncryptionTests.cs NATS.Server.JetStream.Tests/
git mv NATS.Server.Tests/MemStoreTests.cs NATS.Server.JetStream.Tests/
git mv NATS.Server.Tests/StreamStoreContractTests.cs NATS.Server.JetStream.Tests/
git mv NATS.Server.Tests/MirrorSourceRetryTests.cs NATS.Server.JetStream.Tests/
git mv NATS.Server.Tests/ClusterJetStreamConfigProcessorTests.cs NATS.Server.JetStream.Tests/

Step 3: Update namespaces

  • namespace NATS.Server.Tests;namespace NATS.Server.JetStream.Tests; (root files)
  • namespace NATS.Server.Tests.JetStream;namespace NATS.Server.JetStream.Tests.JetStream;
  • All JetStream sub-namespaces follow the pattern (e.g., NATS.Server.Tests.JetStream.ClusterNATS.Server.JetStream.Tests.JetStream.Cluster)

Step 4: Update fixture references

Files using JetStreamApiFixture or JetStreamClusterFixture need using NATS.Server.TestUtilities; since the fixtures moved there in Task 1.

Step 5: Replace duplicated helpers with TestUtilities calls

Step 6: Add to solution, build, test

Run: dotnet build && dotnet test tests/NATS.Server.JetStream.Tests --no-build

Step 7: Commit

git add -A
git commit -m "refactor: extract NATS.Server.JetStream.Tests project"

Task 11: Rename remaining project to NATS.Server.Core.Tests

Files:

  • Rename: tests/NATS.Server.Tests/tests/NATS.Server.Core.Tests/
  • Rename: tests/NATS.Server.Tests/NATS.Server.Tests.csprojtests/NATS.Server.Core.Tests/NATS.Server.Core.Tests.csproj
  • Modify: NatsDotNet.slnx (update path)

Step 1: Rename directory and csproj

cd tests
git mv NATS.Server.Tests NATS.Server.Core.Tests
cd NATS.Server.Core.Tests
git mv NATS.Server.Tests.csproj NATS.Server.Core.Tests.csproj

Step 2: Update solution file

Replace tests/NATS.Server.Tests/NATS.Server.Tests.csproj with tests/NATS.Server.Core.Tests/NATS.Server.Core.Tests.csproj.

Step 3: Clean up csproj

Remove the JETSTREAM_INTEGRATION_MATRIX DefineConstants (that moved to JetStream.Tests). Remove any package references only needed by extracted projects (e.g., NATS.NKeys if only auth tests needed it). Keep NATS.Client.Core and Serilog.Sinks.File.

Step 4: Update namespaces

Change namespace NATS.Server.Tests;namespace NATS.Server.Core.Tests; in all remaining files. Update sub-namespaces: NATS.Server.Tests.ConfigurationNATS.Server.Core.Tests.Configuration, etc.

Step 5: Replace duplicated helpers with TestUtilities calls

Step 6: Build and test all projects

Run: dotnet build && dotnet test Expected: All projects build and all tests pass.

Step 7: Commit

git add -A
git commit -m "refactor: rename remaining tests to NATS.Server.Core.Tests"

Task 12: Final verification and cleanup

Step 1: Run full test suite

dotnet test -v normal 2>&1 | tail -20

Expected: All test projects discovered and run. Total test count should match original (~6,409 parameterized tests).

Step 2: Verify each project runs independently

dotnet test tests/NATS.Server.Core.Tests
dotnet test tests/NATS.Server.Auth.Tests
dotnet test tests/NATS.Server.JetStream.Tests
dotnet test tests/NATS.Server.Raft.Tests
dotnet test tests/NATS.Server.Clustering.Tests
dotnet test tests/NATS.Server.Gateways.Tests
dotnet test tests/NATS.Server.LeafNodes.Tests
dotnet test tests/NATS.Server.Mqtt.Tests
dotnet test tests/NATS.Server.Monitoring.Tests
dotnet test tests/NATS.Server.Transport.Tests
dotnet test tests/NATS.E2E.Tests

Step 3: Verify solution structure

dotnet sln NatsDotNet.slnx list

Expected: 13 projects listed (2 src + 11 test).

Step 4: Check for orphaned files

find tests/NATS.Server.Core.Tests -name "*.cs" -not -path "*/obj/*" -not -path "*/bin/*" | wc -l

Should be ~75 files. Any file that doesn't belong in Core should be moved to its correct project.

Step 5: Clean build artifacts and rebuild from scratch

dotnet clean && dotnet build && dotnet test

Step 6: Commit any cleanup

git add -A
git commit -m "chore: final cleanup after test project split"