[Fact]
public async Task HomeIsOk()
{
    using var factory =  new WebApplicationFactory<Startup>();
    var client = factory.CreateClient();

    var response =  await client
        .GetAsync( new Uri("", UriKind.Relative))
        .ConfigureAwait( false);

    Assert.True(
        response.IsSuccessStatusCode,
        $"Actual status code: {response.StatusCode}.");
}