.Net Core Unit Testing - Mock IOptions

Jak

908 Points

132 Posts

I have a .NET core rest api service and controller. I'm using xUnitTest to test the controller and service.
Service has a constructor argument of IOptions where AppSettings is my class for config settings.

In my unit test project to test the service/controller. I'm not able to mock/initialize an instance of IOptions to satisfy the constructor of my controller:

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);
    }
}

.netcore c#unit-testing

Views: 13473
Total Answered: 2
Total Marked As Answer: 1
Posted On: 24-Apr-2020 04:55

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Use Microsoft.Extensions.Options.Options

- beginer 25-Apr-2020 01:59

Answers

Alice

32 Points

1 Posts

Use Helper class Microsoft.Extensions.Options.Options

Options.Create() a wrapper around an instance of TOptions to return itself as IOptions

SampleOptions sampleOptions = new SampleOptions() { ConnectionString = "..." };
IOptions<SampleOptions> options = Options.Create(sampleOptions);

Posted On: 25-Apr-2020 02:03

Smith

2890 Points

78 Posts

Check following code:

public class SampleRepoTests
{
    private IOptions<SampleOptions> _options;
    private SampleRepo _sampleRepo;


    public SampleRepoTests()
    {
        // mock the settings here
        var sampleOptions = new SampleOptions(){ /* here, assign value to the properties*/ };
        
        _options = Options.Create(sampleOptions);

        _sampleRepo = new SampleRepo(_options);
    }
}

For this following package to be installed