food-market/tests/food-market.IntegrationTests/InvoiceUploadHttpTests.cs

using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text;
using System.Text.Json;
using FluentAssertions;
using foodmarket.IntegrationTests.Support;
using Xunit;

namespace foodmarket.IntegrationTests;

/// <summary>Регресс по hotfix-invoice500: до фикса
/// <c>POST /api/purchases/invoices/upload</c> ложился в 500 из-за
/// NOT NULL constraint на <c>UpdatedAt</c>. Тест ХОДИТ ЧЕРЕЗ HTTP на реальной
/// Postgres (Testcontainers), с мульти-файловой multipart-формой, чтобы впредь
/// заметить, если кто-то снова сделает UpdatedAt NOT NULL.</summary>
[Collection(ApiCollection.Name)]
public class InvoiceUploadHttpTests
{
    private readonly ApiFactory _factory;
    public InvoiceUploadHttpTests(ApiFactory factory) => _factory = factory;

    [Fact]
    public async Task Upload_single_file_returns_200_and_persists_row()
    {
        var http = _factory.CreateClient();
        var actor = new ApiActor(http);
        await actor.SignupAndLoginAsync($"invup-{Guid.NewGuid():N}".Substring(0, 20));

        using var form = new MultipartFormDataContent();
        var bytes = Encoding.UTF8.GetBytes("not a real jpeg — байты всё равно сохранятся как файл");
        var filePart = new ByteArrayContent(bytes);
        filePart.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
        form.Add(filePart, "files", "invoice-test.jpg");

        var resp = await http.PostAsync("/api/purchases/invoices/upload", form);
        var body = await resp.Content.ReadAsStringAsync();
        resp.StatusCode.Should().Be(HttpStatusCode.OK, $"body: {body}");

        var json = JsonDocument.Parse(body).RootElement;
        var ids = json.GetProperty("ids").EnumerateArray().Select(e => e.GetGuid()).ToList();
        ids.Should().HaveCount(1);

        // detail endpoint тоже должен корректно отвечать 200 (UpdatedAt null в select'е ок)
        var detail = await http.GetFromJsonAsync<JsonElement>($"/api/purchases/invoices/{ids[0]}");
        detail.GetProperty("fileName").GetString().Should().Be("invoice-test.jpg");
        detail.GetProperty("status").GetString().Should().Be("pending");
    }

    [Fact]
    public async Task Upload_multiple_files_in_one_request_all_persist()
    {
        var http = _factory.CreateClient();
        var actor = new ApiActor(http);
        await actor.SignupAndLoginAsync($"invup2-{Guid.NewGuid():N}".Substring(0, 20));

        using var form = new MultipartFormDataContent();
        for (var i = 0; i < 3; i++)
        {
            var fp = new ByteArrayContent(Encoding.UTF8.GetBytes($"file-{i}"));
            fp.Headers.ContentType = new MediaTypeHeaderValue("image/png");
            form.Add(fp, "files", $"inv-{i}.png");
        }

        var resp = await http.PostAsync("/api/purchases/invoices/upload", form);
        resp.StatusCode.Should().Be(HttpStatusCode.OK);
        var ids = (await resp.Content.ReadFromJsonAsync<JsonElement>())
            .GetProperty("ids").EnumerateArray().Select(e => e.GetGuid()).ToList();
        ids.Should().HaveCount(3);
    }
}