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using System.Net;
using System.Text;
using System.Text.Json;
using Agent.App.Configuration;
using Agent.Core.Ollama;
using Agent.Core.Tools;
namespace Agent.Core.Tests;
public sealed class OllamaClientTests
{
[Fact]
public async Task Chat_sends_expected_request_and_returns_usage()
{
string? body = null;
var handler = new StubHandler(async (request, _) =>
{
body = await request.Content!.ReadAsStringAsync();
return Json(HttpStatusCode.OK, """{"message":{"role":"assistant","content":"done"},"prompt_eval_count":12,"eval_count":7}""");
});
OllamaClient client = Create(handler, options: new Dictionary<string, JsonElement>
{
["temperature"] = JsonSerializer.SerializeToElement(0.2),
["seed"] = JsonSerializer.SerializeToElement(42)
});
OllamaResult result = await client.ChatAsync([new OllamaMessage("user", "hello")], 0.7, TestContext.Current.CancellationToken);
Assert.Equal("done", result.Content);
Assert.Equal(12, result.InputTokens);
Assert.Equal(7, result.OutputTokens);
using JsonDocument document = JsonDocument.Parse(body!);
JsonElement root = document.RootElement;
Assert.Equal("test-model", root.GetProperty("model").GetString());
Assert.False(root.GetProperty("stream").GetBoolean());
Assert.Equal(0.7, root.GetProperty("options").GetProperty("temperature").GetDouble());
Assert.Equal(42, root.GetProperty("options").GetProperty("seed").GetInt32());
}
[Fact]
public async Task Transient_failure_retries_three_times_with_configured_backoff()
{
int attempts = 0;
var delays = new List<TimeSpan>();
var handler = new StubHandler((_, _) =>
{
attempts++;
return Task.FromResult(attempts < 4
? Json(HttpStatusCode.ServiceUnavailable, "busy")
: Json(HttpStatusCode.OK, """{"message":{"role":"assistant","content":"ok"}}"""));
});
var client = new OllamaClient(new HttpClient(handler), Settings(), (delay, _) =>
{
delays.Add(delay);
return Task.CompletedTask;
});
OllamaResult result = await client.ChatAsync([new OllamaMessage("user", "hello")], null, TestContext.Current.CancellationToken);
Assert.Equal("ok", result.Content);
Assert.Equal(4, attempts);
Assert.Equal([TimeSpan.FromMilliseconds(250), TimeSpan.FromMilliseconds(500), TimeSpan.FromMilliseconds(1000)], delays);
}
[Fact]
public async Task Permanent_failure_is_not_retried()
{
int attempts = 0;
var handler = new StubHandler((_, _) =>
{
attempts++;
return Task.FromResult(Json(HttpStatusCode.BadRequest, "invalid"));
});
OllamaClient client = Create(handler);
OllamaException error = await Assert.ThrowsAsync<OllamaException>(() =>
client.ChatAsync([new OllamaMessage("user", "hello")], null, TestContext.Current.CancellationToken));
Assert.False(error.IsTransient);
Assert.Equal(1, attempts);
}
[Fact]
public void Typed_options_override_extra_options()
{
var configuration = new OllamaConfiguration
{
Endpoint = "http://127.0.0.1:11434",
Model = "model",
Options = new OllamaGenerationOptions { Temperature = 0.4, NumCtx = 8192 },
ExtraOptions = new Dictionary<string, object?>
{
["temperature"] = 1.9,
["num_ctx"] = 256,
["custom"] = "preserved"
}
};
OllamaSettings settings = OllamaSettingsFactory.Create(configuration);
Assert.Equal(0.4, settings.Options["temperature"].GetDouble());
Assert.Equal(8192, settings.Options["num_ctx"].GetInt32());
Assert.Equal("preserved", settings.Options["custom"].GetString());
}
[Fact]
public async Task Native_tool_catalog_is_serialized_and_tool_call_is_parsed()
{
string? body = null;
var handler = new StubHandler(async (request, _) =>
{
body = await request.Content!.ReadAsStringAsync();
return Json(HttpStatusCode.OK, """{"message":{"role":"assistant","content":"","tool_calls":[{"function":{"name":"file_read","arguments":{"path":"x","mode":"whole"}}}]},"prompt_eval_count":2,"eval_count":1}""");
});
OllamaClient client = Create(handler);
OllamaResult result = await client.ChatWithToolsAsync([new OllamaMessage("user", "read")], null, InternalToolCatalog.All, TestContext.Current.CancellationToken);
using JsonDocument document = JsonDocument.Parse(body!);
Assert.Equal(5, document.RootElement.GetProperty("tools").GetArrayLength());
Assert.All(document.RootElement.GetProperty("tools").EnumerateArray(), tool =>
Assert.False(tool.GetProperty("function").GetProperty("parameters").GetProperty("additionalProperties").GetBoolean()));
OllamaToolCall call = Assert.Single(result.ToolCalls!);
Assert.Equal("file_read", call.Function.Name);
Assert.Equal("x", call.Function.Arguments.GetProperty("path").GetString());
}
private static OllamaClient Create(HttpMessageHandler handler, IReadOnlyDictionary<string, JsonElement>? options = null) =>
new(new HttpClient(handler), Settings(options), static (_, _) => Task.CompletedTask);
private static OllamaSettings Settings(IReadOnlyDictionary<string, JsonElement>? options = null) =>
new(new Uri("http://127.0.0.1:11434"), "test-model", false, "0", options ?? new Dictionary<string, JsonElement>());
private static HttpResponseMessage Json(HttpStatusCode statusCode, string content) => new(statusCode)
{
Content = new StringContent(content, Encoding.UTF8, "application/json")
};
private sealed class StubHandler(Func<HttpRequestMessage, CancellationToken, Task<HttpResponseMessage>> callback) : HttpMessageHandler
{
protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) => callback(request, cancellationToken);
}
}
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