Null Object Pattern Example

Example.cs

#nullable enable

using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace TestProject4
{
    public interface IDependency { void DoSomething(); }

    public class NullDependency : IDependency
    {
        public void DoSomething() { }
    }

    public class Example
    {
        readonly IDependency dependency;

        public Example(IDependency? dependency = null)
        {
            this.dependency = dependency ?? new NullDependency();
        }
    }

    [TestClass]
    public class UnitTest1
    {
        [TestMethod]
        public void TestMethod1()
        {
            new Example();
        }
    }
}