CODEWITHSUNDEEP
c#unit-testingasp.net-core
Sohlae
Sohlae

Reputation: 786

How to Unit Test a Class That Has a Static Method Which Gets Information From an External Resource

In our application we have a method that calls a static class. This class has a method that gets information from a database.

The Load method is called on the Startup.cs of the application, thus, it only runs once. The rationale behind this approach is since the list of holidays only changes once a year, it doesn't make sense to get this information from the database for every single request made to GetHolidayNames().

// Method calling the static class
public class HolidayService()
{
    public List<string> GetHolidayNames()
    {
        var result = Loader.HolidayNames;

        return result;
    }
}

// Static class
public static class Loader
{
    public static List<string> HolidayNames;

    public static void Load(IUnitOfWork unitOfWork)
    {
        HolidayNames = unitOfWork.Holidays.GetHolidayNames();

        return;
    }
}

Is it still possible to unit test GetHolidayNames() given this scenario?

Upvotes: 1

Views: 1238

Answers (1)

A-A-ron
A-A-ron

Reputation: 559

I think it is still possible to unit test. Given your code snippet I've created a unit test with xUnit and Moq that I believe will allow for the GetHolidayNames() to be unit tested. I understand that the assertion at the end isn't probably what you're looking for, but I've added it to complete this example.

[Fact]
public void TestHolidayService()
{
    // Use Moq to create a mock of your IUnitOfWork
    var mockUnitOfWork = new Mock<IUnitOfWork>();
    
    // Setup the getter which is called on IUnitOfWork (may need to set up more state for .GetHolidayNames())
    mockUnitOfWork.SetupGet(x => x.Holidays).Returns(new Holiday());
    
    // Call the Load method with mocked IUnitOfWork
    Loader.Load(mockUnitOfWork.Object);
    var sut = new HolidayService();

    var result = sut.GetHolidayNames();

    Assert.NotNull(result);
}

Upvotes: 2

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