Asp.net Core 2.1 Xunit Test Configuration

AspNetCore21.Tests.cs

public static class Tests
{
    public const string Integration = "IntegrationTests";
}

public class IntegrationTestApplicationFactory : WebApplicationFactory<Startup>
{
    protected override IWebHostBuilder CreateWebHostBuilder()
    {
        return new WebHostBuilder()
            .UseSerilog()
            .UseStartup<Startup>();
    }
}

public class IntegrationTestFixture : ICollectionFixture<IntegrationTestApplicationFactory>
{
    public IntegrationTestFixture()
    {
        var factory = new IntegrationTestApplicationFactory();
        Client = factory.CreateClient();
    }

    public readonly HttpClient Client;
}

[CollectionDefinition(Tests.Integration)]
public class IntegrationTestsCollection : ICollectionFixture<IntegrationTestFixture>
{
    // This class has no code, and is never created. Its purpose is simply
    // to be the place to apply [CollectionDefinition] and all the
    // ICollectionFixture<> interfaces.
}

[Collection(Tests.Integration)]
public class HealthTests
{
    readonly IntegrationTestFixture _fixture;

    public HealthTests(IntegrationTestFixture fixture)
    {
        _fixture = fixture;
    }

    [Fact]
    public async Task Ping_should_return_the_date()
    {
        var result = await _fixture.Client
            .For("http://localhost/ping")
            .GetAsync();

        await result.EnsureValid();

        string content = await result.Content.ReadAsStringAsync();

        Assert.True(result.IsSuccessStatusCode);
        Assert.True(content.Length > 0);
    }
}