aspnetcore/test/Microsoft.AspNet.Mvc.FunctionalTests/JsonOutputFormatterTests.cs

using System;
using System.Threading.Tasks;
using Microsoft.AspNet.Builder;
using Microsoft.AspNet.TestHost;
using Newtonsoft.Json;
using Xunit;

namespace Microsoft.AspNet.Mvc.FunctionalTests
{
    public class JsonOutputFormatterTests
    {
        private readonly IServiceProvider _provider = TestHelper.CreateServices("FormatterWebSite");
        private readonly Action<IApplicationBuilder> _app = new FormatterWebSite.Startup().Configure;

        [Fact]
        public async Task JsonOutputFormatter_ReturnsIndentedJson()
        {
            // Arrange
            var user = new FormatterWebSite.User()
            {
                Id = 1,
                Alias = "john",
                description = "Administrator",
                Designation = "Administrator",
                Name = "John Williams"
            };

            var serializerSettings = new JsonSerializerSettings();
            serializerSettings.Formatting = Formatting.Indented;
            var expectedBody = JsonConvert.SerializeObject(user, serializerSettings);

            var server = TestServer.Create(_provider, _app);
            var client = server.CreateClient();

            // Act
            var response = await client.GetAsync("http://localhost/JsonFormatter/ReturnsIndentedJson");

            // Assert
            var actualBody = await response.Content.ReadAsStringAsync();
            Assert.Equal(expectedBody, actualBody);
        }
    }
}