Read the context window from four more model lists

app/Tests/Provider/ModelListMetadataTests.cs

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+using System.Text.Json;
+
+using AIStudio.Provider.Groq;
+using AIStudio.Provider.OpenRouter;
+
+using MistralModelsResponse = AIStudio.Provider.Mistral.ModelsResponse;
+using SelfHostedModelsResponse = AIStudio.Provider.SelfHosted.ModelsResponse;
+
+namespace AIStudio.Tests.Provider;
+
+/// <summary>
+/// Checks that the numbers a provider already sends actually arrive in the records reading them.
+/// </summary>
+/// <remarks>
+/// Every one of these providers spells the context window differently, and each record renames it
+/// to the one word the app uses. Getting such a name wrong fails silently -- the field stays null,
+/// the model list still loads, and the only symptom is a window nobody ever sees. The snippets
+/// below are shortened answers of the real routes, so that a rename is caught here rather than by
+/// somebody wondering why their window never shows up.
+///
+/// The options mirror what the providers deserialize with: names in snake case, which is what makes
+/// the renaming attributes necessary in the first place.
+/// </remarks>
+[TestFixture]
+public sealed class ModelListMetadataTests
+{
+    private static readonly JsonSerializerOptions AS_THE_PROVIDERS_READ_IT = new()
+    {
+        PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower,
+    };
+
+    [Test]
+    // ReSharper disable once InconsistentNaming
+    public void VLLMStatesTheWindowItWasStartedWith()
+    {
+        var response = JsonSerializer.Deserialize<SelfHostedModelsResponse>("""
+                                                                           {
+                                                                               "object": "list",
+                                                                               "data": [
+                                                                                   { "id": "Qwen/Qwen3-32B", "object": "model", "owned_by": "vllm", "max_model_len": 32768 }
+                                                                               ]
+                                                                           }
+                                                                           """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.That(response.Data, Is.Not.Null);
+        Assert.Multiple(() =>
+        {
+            Assert.That(response.Data![0].ContextWindowTokens, Is.EqualTo(32_768));
+            Assert.That(response.Data[0].OwnedBy, Is.EqualTo("vllm"), "Read with the shared options, this one arrives too -- it did not before.");
+        });
+    }
+
+    [Test]
+    public void AnEngineWhichStatesNoWindowLeavesItUnknown()
+    {
+        //
+        // Ollama and LM Studio answer the very same route without that field. Nothing may fail
+        // over it, and nothing may be invented for it either.
+        //
+        var response = JsonSerializer.Deserialize<SelfHostedModelsResponse>("""
+                                                                           {
+                                                                               "object": "list",
+                                                                               "data": [ { "id": "gemma3:1b", "object": "model" } ]
+                                                                           }
+                                                                           """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.That(response.Data, Is.Not.Null);
+        Assert.That(response.Data![0].ContextWindowTokens, Is.Null);
+    }
+
+    [Test]
+    public void OpenRouterStatesTheWindowOfTheModel()
+    {
+        var response = JsonSerializer.Deserialize<OpenRouterModelsResponse>("""
+                                                                           {
+                                                                               "data": [
+                                                                                   {
+                                                                                       "id": "anthropic/claude-sonnet-4.5",
+                                                                                       "name": "Anthropic: Claude Sonnet 4.5",
+                                                                                       "context_length": 1000000,
+                                                                                       "architecture": { "tokenizer": "Claude" },
+                                                                                       "top_provider": { "max_completion_tokens": 64000 }
+                                                                                   }
+                                                                               ]
+                                                                           }
+                                                                           """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(1_000_000));
+            Assert.That(response.Data[0].Name, Is.EqualTo("Anthropic: Claude Sonnet 4.5"), "The fields we do read keep working next to the fields we deliberately do not.");
+        });
+    }
+
+    [Test]
+    public void GroqStatesTheWindowAsTheContextWindow()
+    {
+        var response = JsonSerializer.Deserialize<GroqModelsResponse>("""
+                                                                     {
+                                                                         "object": "list",
+                                                                         "data": [ { "id": "llama-3.3-70b-versatile", "object": "model", "context_window": 131072 } ]
+                                                                     }
+                                                                     """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(131_072));
+    }
+
+    [Test]
+    public void MistralStatesTheWindowAsAMaximumLength()
+    {
+        var response = JsonSerializer.Deserialize<MistralModelsResponse>("""
+                                                                        {
+                                                                            "object": "list",
+                                                                            "data": [ { "id": "mistral-large-latest", "object": "model", "created": 1700000000, "owned_by": "mistralai", "max_context_length": 131072 } ]
+                                                                        }
+                                                                        """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.That(response.Data[0].ContextWindowTokens, Is.EqualTo(131_072));
+    }
+
+    [Test]
+    public void TheRouterStatesAWindowPerInferenceProvider()
+    {
+        var response = JsonSerializer.Deserialize<AIStudio.Provider.HuggingFace.ModelsResponse>("""
+                                                                                               {
+                                                                                                   "data": [
+                                                                                                       {
+                                                                                                           "id": "deepseek-ai/DeepSeek-R1",
+                                                                                                           "providers": [
+                                                                                                               { "provider": "novita", "status": "live", "context_length": 64000 },
+                                                                                                               { "provider": "together", "status": "live", "context_length": 128000 }
+                                                                                                           ]
+                                                                                                       }
+                                                                                                   ]
+                                                                                               }
+                                                                                               """, AS_THE_PROVIDERS_READ_IT);
+
+        Assert.That(response.Data[0].Providers, Is.Not.Null);
+        Assert.That(response.Data[0].Providers![0].ContextWindowTokens, Is.EqualTo(64_000));
+    }
+}