Add provider HTTP classification tests

tests/Jellyfin.Plugin.Multilang.Tests/ProviderHttpTests.cs

@@ -0,0 +1,36 @@
+using System.Net;
+using Jellyfin.Plugin.Multilang.Services.Providers;
+
+namespace Jellyfin.Plugin.Multilang.Tests;
+
+public sealed class ProviderHttpTests
+{
+    [Theory]
+    [InlineData(HttpStatusCode.TooManyRequests)]
+    [InlineData(HttpStatusCode.RequestTimeout)]
+    [InlineData(HttpStatusCode.InternalServerError)]
+    [InlineData(HttpStatusCode.BadGateway)]
+    [InlineData(HttpStatusCode.ServiceUnavailable)]
+    [InlineData(HttpStatusCode.GatewayTimeout)]
+    public void ClassifyMarksRateLimitTimeoutAndServerErrorsRetryable(HttpStatusCode statusCode)
+    {
+        Assert.Equal(ProviderFailureKind.Retryable, ProviderHttp.Classify(statusCode));
+    }
+
+    [Theory]
+    [InlineData(HttpStatusCode.BadRequest)]
+    [InlineData(HttpStatusCode.Unauthorized)]
+    [InlineData(HttpStatusCode.Forbidden)]
+    [InlineData(HttpStatusCode.NotFound)]
+    [InlineData(HttpStatusCode.UnprocessableEntity)]
+    public void ClassifyMarksClientErrorsTerminal(HttpStatusCode statusCode)
+    {
+        Assert.Equal(ProviderFailureKind.Terminal, ProviderHttp.Classify(statusCode));
+    }
+
+    [Fact]
+    public void ClassifyMarksSuccessTerminal()
+    {
+        Assert.Equal(ProviderFailureKind.Terminal, ProviderHttp.Classify(HttpStatusCode.OK));
+    }
+}