hrynco-notification-service/HrynCo.NotificationService.Services.Tests/EmailProcessing/SendEmailContractTests.cs

namespace HrynCo.NotificationService.Services.Tests.EmailProcessing;

using System.Text.Json;
using HrynCo.NotificationService.Contracts.Messages;
using HrynCo.NotificationService.Worker.Services.EmailProcessing;

public sealed class SendEmailContractTests
{
    private const string ItemTrackerPayload = """
        {
          "CorrelationContext": {
            "CorrelationId": "3ec4ad3f-0a8a-49f3-b31d-cdad5d1b95cc",
            "ReplyTo": "item-tracker.notifications.result"
          },
          "Data": {
            "ServiceName": "StoreMate-Prod",
            "TemplateKey": "EmailVerification",
            "RecipientEmail": "owner@example.com",
            "RecipientName": "StoreMate Owner",
            "Variables": {
              "AppName": "StoreMate",
              "VerificationUrl": "https://example.invalid/sensitive-token"
            },
            "LanguageCode": "uk"
          }
        }
        """;

    [Fact]
    public void PascalCaseItemTrackerPayload_DeserializesWithoutLosingValues()
    {
        SendEmailMessage? message = JsonSerializer.Deserialize<SendEmailMessage>(ItemTrackerPayload);

        Assert.NotNull(message);
        SendEmailMessageValidator.Validate(message);
        Assert.Equal("3ec4ad3f-0a8a-49f3-b31d-cdad5d1b95cc", message.CorrelationContext.CorrelationId);
        Assert.Equal("item-tracker.notifications.result", message.CorrelationContext.ReplyTo);
        Assert.Equal("StoreMate-Prod", message.Data.ServiceName);
        Assert.Equal("EmailVerification", message.Data.TemplateKey);
        Assert.Equal("owner@example.com", message.Data.RecipientEmail);
        Assert.Equal("StoreMate Owner", message.Data.RecipientName);
        Assert.Equal("uk", message.Data.LanguageCode);
        Assert.Equal("StoreMate", message.Data.Variables["AppName"]);
        Assert.Equal(
            "https://example.invalid/sensitive-token",
            message.Data.Variables["VerificationUrl"]);
    }

    [Fact]
    public void MissingLanguageCode_IsRejected()
    {
        SendEmailMessage? message = JsonSerializer.Deserialize<SendEmailMessage>(
            ItemTrackerPayload.Replace("\"uk\"", "null", StringComparison.Ordinal));

        InvalidDataException exception = Assert.Throws<InvalidDataException>(
            () => SendEmailMessageValidator.Validate(message!));

        Assert.Equal("LanguageCode is required.", exception.Message);
    }
}