baseline: OpenMU upstream b5a0961 (fresh source)

tests/MUnique.OpenMU.Network.Tests/IpAddressResolverFactoryTests.cs

@@ -0,0 +1,89 @@
+// <copyright file="IpAddressResolverFactoryTests.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Network.Tests;
+
+using System.Net;
+using Microsoft.Extensions.Logging.Abstractions;
+
+/// <summary>
+/// Tests for <see cref="IpAddressResolverFactory"/>.
+/// </summary>
+[TestFixture]
+[NonParallelizable]
+public class IpAddressResolverFactoryTests
+{
+    private readonly IPAddress _expectedLoopbackAddress = IPAddress.Parse("127.127.127.127");
+
+    private string? _originalResolveIpEnvironmentVariable;
+    private string? _originalAspNetCoreEnvironmentVariable;
+
+    /// <summary>
+    /// Captures and clears the environment variables which influence resolver determination.
+    /// </summary>
+    [SetUp]
+    public void SetUp()
+    {
+        this._originalResolveIpEnvironmentVariable = Environment.GetEnvironmentVariable("RESOLVE_IP");
+        this._originalAspNetCoreEnvironmentVariable = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
+        Environment.SetEnvironmentVariable("RESOLVE_IP", null);
+        Environment.SetEnvironmentVariable("ASPNETCORE_ENVIRONMENT", null);
+    }
+
+    /// <summary>
+    /// Restores the environment variables which were changed during a test.
+    /// </summary>
+    [TearDown]
+    public void TearDown()
+    {
+        Environment.SetEnvironmentVariable("RESOLVE_IP", this._originalResolveIpEnvironmentVariable);
+        Environment.SetEnvironmentVariable("ASPNETCORE_ENVIRONMENT", this._originalAspNetCoreEnvironmentVariable);
+    }
+
+    /// <summary>
+    /// Tests if runtime reconfiguration is ignored when the resolver was configured by startup parameters.
+    /// </summary>
+    /// <returns>The asynchronous operation.</returns>
+    [Test]
+    public async Task ResolverConfiguredByStartupParameterCannotBeOverriddenAsync()
+    {
+        var resolver = (ConfigurableIpResolver)IpAddressResolverFactory.CreateIpResolver(new[] { "-resolveIP:loopback" }, (IpResolverType.Public, null), new NullLoggerFactory());
+
+        resolver.Configure(IpResolverType.Custom, "1.2.3.4");
+        var resolvedAddress = await resolver.ResolveIPv4Async().ConfigureAwait(false);
+
+        Assert.That(resolvedAddress, Is.EqualTo(this._expectedLoopbackAddress));
+    }
+
+    /// <summary>
+    /// Tests if runtime reconfiguration is ignored when the resolver was configured by environment variable.
+    /// </summary>
+    /// <returns>The asynchronous operation.</returns>
+    [Test]
+    public async Task ResolverConfiguredByEnvironmentVariableCannotBeOverriddenAsync()
+    {
+        Environment.SetEnvironmentVariable("RESOLVE_IP", "loopback");
+        var resolver = (ConfigurableIpResolver)IpAddressResolverFactory.CreateIpResolver(Array.Empty<string>(), (IpResolverType.Public, null), new NullLoggerFactory());
+
+        resolver.Configure(IpResolverType.Custom, "1.2.3.4");
+        var resolvedAddress = await resolver.ResolveIPv4Async().ConfigureAwait(false);
+
+        Assert.That(resolvedAddress, Is.EqualTo(this._expectedLoopbackAddress));
+    }
+
+    /// <summary>
+    /// Tests if runtime reconfiguration still works when the resolver was configured by persisted settings.
+    /// </summary>
+    /// <returns>The asynchronous operation.</returns>
+    [Test]
+    public async Task ResolverConfiguredByPersistedSettingsCanBeOverriddenAsync()
+    {
+        var resolver = (ConfigurableIpResolver)IpAddressResolverFactory.CreateIpResolver(Array.Empty<string>(), (IpResolverType.Loopback, null), new NullLoggerFactory());
+
+        resolver.Configure(IpResolverType.Custom, "1.2.3.4");
+        var resolvedAddress = await resolver.ResolveIPv4Async().ConfigureAwait(false);
+
+        Assert.That(resolvedAddress, Is.EqualTo(IPAddress.Parse("1.2.3.4")));
+    }
+}