Fake Authentication Jwt Bearer for ASP.NET Core

This code allow to fake a Jwt Bearer and build integration test for ASP.Net Core application.
By this way we can fake any authentication we need, without the need to really authenticate a user.
This code is based on Microsoft.AspNetCore.Authentication.JwtBearer and was forked from GST.Fake.Authentication.JwtBearer.

If You need it for ASP.NET Core 1, check Tag 1.0.4

If You need it for ASP.NET Core 2.1, check Tag 2.1.2

If you need it for ASP.NET Core 2.2, check Tag 2.2.0

If you need it for ASP.NET Core 3.1, check Tag 3.1.1

If you need it for ASP.NET Core 5.0, check Tag 5.1.0

If you need it for ASP.NET Core 6.0, check Tag 6.1.1

NOTE: Version 4.0 was skipped to follow Microsoft versioning pattern for .NET

How to install it?

Install the package WebMotions.Fake.Authentication.JwtBearer
OR
Clone and reference the project Fake.Authentication.JwtBearer under the src folder in your test(s) project(s)

How to use it?

Now all the things are tied up, how to fake a user?

I've defined three tests methods :

• One that verifies a token through an Expando object
• One that verifies a token through a dictionary of claims
• One that fails if the token is not set

All of the below can be found under the samples folder

using System;
using System.Dynamic;
using System.Net;
using System.Threading.Tasks;
using FluentAssertions;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.TestHost;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using WebMotions.Fake.Authentication.JwtBearer;
using Xunit;

namespace Sample.WebApplication.Tests
{
    public class WeatherForecastControllerTests : IDisposable
    {
        private readonly IHost _host;

        public WeatherForecastControllerTests()
        {
            _host = new HostBuilder()
                .ConfigureWebHost(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                    webBuilder
                        .UseTestServer()
                        .ConfigureTestServices(collection =>
                        {
                            collection.AddAuthentication(FakeJwtBearerDefaults.AuthenticationScheme).AddFakeJwtBearer();
                        });
                }).Build();
        }

        [Fact]
        public async Task root_endpoint_should_not_return_authorized_when_jwt_is_set()
        {
            await _host.StartAsync();
            dynamic data = new ExpandoObject();
            data.sub = Guid.NewGuid();
            data.role = new [] {"sub_role","admin"};

            var httpClient = _host.GetTestServer().CreateClient();
            httpClient.SetFakeBearerToken((object)data);

            var response = await httpClient.GetAsync("/api/weatherforecast");
            response.StatusCode.Should().Be(HttpStatusCode.OK);
        }

        [Fact]
        public async Task root_endpoint_should_return_unauthorized_when_jwt_is_not_set()
        {
            await _host.StartAsync();
            var response = await _host.GetTestServer().CreateClient().GetAsync("/api/weatherforecast");
            response.StatusCode.Should().Be(HttpStatusCode.Unauthorized);
        }

        [Fact]
        public async Task root_endpoint_should_authorized_when_jwt_is_set_with_using_claims_dictionary()
        {
            await _host.StartAsync();
            var claims = new Dictionary<string, object>
            {
                { ClaimTypes.Name, "[email protected]" },
                { ClaimTypes.Role, "admin" },
                { "http://mycompany.com/customClaim", "someValue" },
            };
            var httpClient = _host.GetTestServer().CreateClient();
            httpClient.SetFakeBearerToken(claims);
            var response = await httpClient.GetAsync("/api/weatherforecast");
            response.StatusCode.Should().Be(HttpStatusCode.OK);
        }

        public void Dispose()
        {
            _host?.Dispose();
        }
    }
}