I feel like I'm missing something really obvious here. I have classes that require injecting of options using the .NET Core IOptions
pattern(?). When I unit test that class, I want to mock various versions of the options to validate the functionality of the class. Does anyone know how to correctly mock/instantiate/populate IOptions<T>
outside of the Startup class?
Here are some samples of the classes I'm working with:
Settings/Options Model
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace OptionsSample.Models
{
public class SampleOptions
{
public string FirstSetting { get; set; }
public int SecondSetting { get; set; }
}
}
Class to be tested which uses the Settings:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using OptionsSample.Models
using System.Net.Http;
using Microsoft.Extensions.Options;
using System.IO;
using Microsoft.AspNetCore.Http;
using System.Xml.Linq;
using Newtonsoft.Json;
using System.Dynamic;
using Microsoft.Extensions.Logging;
namespace OptionsSample.Repositories
{
public class SampleRepo : ISampleRepo
{
private SampleOptions _options;
private ILogger<AzureStorageQueuePassthru> _logger;
public SampleRepo(IOptions<SampleOptions> options)
{
_options = options.Value;
}
public async Task Get()
{
}
}
}
Unit test in a different assembly from the other classes:
using OptionsSample.Repositories;
using OptionsSample.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Xunit;
using Microsoft.Extensions.Logging;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Configuration;
namespace OptionsSample.Repositories.Tests
{
public class SampleRepoTests
{
private IOptions<SampleOptions> _options;
private SampleRepo _sampleRepo;
public SampleRepoTests()
{
//Not sure how to populate IOptions<SampleOptions> here
_options = options;
_sampleRepo = new SampleRepo(_options);
}
}
}
You need to manually create and populate an IOptions<SampleOptions>
object. You can do so via the Microsoft.Extensions.Options.Options
helper class. For example:
IOptions<SampleOptions> someOptions = Options.Create<SampleOptions>(new SampleOptions());
You can simplify that a bit to:
var someOptions = Options.Create(new SampleOptions());
Obviously this isn't very useful as is. You'll need to actually create and populate a SampleOptions object and pass that into the Create method.