shoc-backend/SeaHavenIndustries.Tests/ConcurrencyExceptionFilterTests.cs

using Api.SeaHavenIndustries.Filters;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.Filters;
using Microsoft.AspNetCore.Routing;
using Microsoft.EntityFrameworkCore;

namespace SeaHavenIndustries.Tests;

public class ConcurrencyExceptionFilterTests
{
    [Fact]
    public void OnException_DbUpdateConcurrencyException_Returns409Conflict()
    {
        var filter = new ConcurrencyExceptionFilter();
        var context = CreateExceptionContext(new DbUpdateConcurrencyException());

        filter.OnException(context);

        Assert.True(context.ExceptionHandled);
        var result = Assert.IsType<ConflictObjectResult>(context.Result);
        Assert.Equal(StatusCodes.Status409Conflict, result.StatusCode);
    }

    [Fact]
    public void OnException_OtherException_DoesNotHandle()
    {
        var filter = new ConcurrencyExceptionFilter();
        var context = CreateExceptionContext(new InvalidOperationException("other"));

        filter.OnException(context);

        Assert.False(context.ExceptionHandled);
        Assert.Null(context.Result);
    }

    private static ExceptionContext CreateExceptionContext(Exception exception)
    {
        var actionContext = new ActionContext(
            new DefaultHttpContext(),
            new RouteData(),
            new ActionDescriptor());

        return new ExceptionContext(actionContext, [])
        {
            Exception = exception
        };
    }
}