Unit Test Moq.MockException was unhandled by user code

I'm trying to run a unit test on a method that sends an email in Microsoft Visual Studio using c#. I am working as an intern and was given a project to create a contactUs page and that works fine. But now my unit tests keeping giving me errors. This is my

ContactUsEmailServiceTest.cs code:

        using System.Configuration;
    using Coop.BusinessLayer.Interfaces.Common;
    using Coop.BusinessLayer.Services;
    using Coop.BusinessLayer.Services.Dto.Input;
    using Moq;
    using NUnit.Framework;

    namespace Coop.Services.Tests
    {
        [TestFixture]
        public class ContactUsEmailServiceTests
        {
            private Mock<IEmailService> _emailService;
            private Mock<IResourcesAccessService> _resourcesAccessService;
            private Mock<ILogger> _logger;
            private ContactUsEmailService _sut;

            [SetUp]
            public void PerTestSetup()
            {
                _emailService = new Mock<IEmailService>();
                _resourcesAccessService = new Mock<IResourcesAccessService>();
                _logger = new Mock<ILogger>();

                _sut = new ContactUsEmailService(_emailService.Object, _resourcesAccessService.Object, _logger.Object);
            }

            [Test] //NS Receiver is not set in web config file
            public void SendEmail_WhenNSReceiverIsNull_EmailIsNotSent()
            {
                //do stuff...
            }

            [Test] //NS Receiver is set in web config file as empty string
            public void SendEmail_WhenNSReceiverIsEmpty_EmailIsNotSent()
            {

                //do stuff...
            }

            [Test]
            public void SendEmail_WhenEmailTemplateIsEmpty_EmailIsNotSent()
            {

                //do stuff...
            }

            [Test]
            public void SendEmail_WhenEmailIsSend_EmailBodyIsProperlyFormated()
            {

                //do stuff...
            }

            [Test]
            public void SendEmail_WhenEmailIsSentAndNameIsNotAvailable_TheNameIsFilledWithDefaultValueInEmailBody()
            {
                //arrange
                ConfigurationManager.AppSettings["northern-safety-contact"] = "contact";
                _resourcesAccessService.Setup(r => r.GetResourceValue("EmailTemplate")).Returns(GetEmailTemplate());

                // Todo: Change input, set Contact Name to string.Empty
                var ContactUsDto = GetContact();
                ContactUsDto.Name = string.Empty;
                // Todo: Update the expect result, replacing Name with "Not Available"
                // See GetContactDetail() as part of ContactUsEmailServices
                var emailBody = GetEmailBody(ContactUsDto);

                //act
                _sut.SendEmail(ContactUsDto);


                //assert
                //check if email was sent 
                /****EXCEPTION REQUIRED HERE - THIS IS WHERE MY DEBUG FAILS******/
                _emailService.Verify(e => e.SendMail(ContactUsDto.Email, ContactUsDto.Email, "User feedback", emailBody));
            }

            private static ContactUsDto GetContact()
            {
                var contactUsDto = new ContactUsDto()
                {
                    //Todo: Create Map to Dto
                    Name = "Name",
                    Email = "123@example.com",
                    PhoneNumber = "0123456789",
                    Street = "Street",
                    City = "City",
                    State = "State",
                    PostCode = "PostCode",
                    Comments = "Comments",
                };
                return contactUsDto;
            }

            private static string GetEmailBody(ContactUsDto ContactUsDto)
            {
                // ToDo: Set expected body
                string emailTemplate = GetEmailTemplate();
                string emailBody;

                // ToDo: Create Email Body by formatting the emailTemplate

                    emailBody = System.String.Format(emailTemplate, ContactUsDto.Name, ContactUsDto.Email, ContactUsDto.PhoneNumber, ContactUsDto.Street,
                        ContactUsDto.City, ContactUsDto.State, ContactUsDto.PostCode, ContactUsDto.Comments);

                return emailBody;
            }

            private static string GetEmailTemplate()
            {
                // Todo: Define Template
                return
                    @"Name<br />Email<br />PhoneNumber<br />Street<br />City<br />State<br />PostCode<br />Comments<br />";
            }
        }
    }

And this is the ContactUsEmailService.cs code I'm trying to test.

    using System;
using System.Configuration;
using Coop.BusinessLayer.Interfaces.Common;
using Coop.BusinessLayer.Services.Dto.Input;

namespace Coop.BusinessLayer.Services
{
    public class ContactUsEmailService : IContactUsEmailService
    {
        private readonly IEmailService _emailService;
        private readonly IResourcesAccessService _resourcesAccessService;
        private readonly ILogger _logger;
        private const string NotAvailable = "Not Available";

        public ContactUsEmailService(IEmailService emailService, IResourcesAccessService resourcesAccessService, ILogger logger)
        {
            _emailService = emailService;
            _resourcesAccessService = resourcesAccessService;
            _logger = logger;
        }

        public bool SendEmail(ContactUsDto contactUsDto)
        {
            var receiver = ConfigurationManager.AppSettings["northern-safety-contact"];
            if (string.IsNullOrEmpty(receiver))
                return false;

            contactUsDto.Name = GetContactDetail(contactUsDto.Name);

            var emailBody = GetEmailBodyFormated(contactUsDto);
            if (string.IsNullOrEmpty(emailBody))
                return false;
            try
            {
                // ToDo: Set Sender Email address
                _emailService.SendMail(contactUsDto.Email, receiver,
                        ServiceResources.EmailTitle, emailBody);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex);
                return false;
            }

            return true;
        }

        private string GetEmailBodyFormated(ContactUsDto contactUsDto)
        {
            string emailTemplate = _resourcesAccessService.GetResourceValue("EmailTemplate");
            string emailBody = null;
            if (string.IsNullOrEmpty(emailTemplate))
                return string.Empty;

            // ToDo: Create Email Body by formatting the emailTemplate
            if (emailTemplate != null)
                emailBody = String.Format(emailTemplate, contactUsDto.Name, contactUsDto.Email, contactUsDto.PhoneNumber, contactUsDto.Street,
                    contactUsDto.City, contactUsDto.State, contactUsDto.PostCode, contactUsDto.Comments);
            return emailBody;
        }

        private static string GetContactDetail(string contactInfo)
        {
            return string.IsNullOrEmpty(contactInfo) ? NotAvailable : contactInfo;
        }
    }
    }

I really don't know too much about Unit testing. I started this internship like 3 weeks ago and kind of go thrown into the idea of using controllers, models and views, I have never really used them before. But now I understand them very well, at leats I think I do. Anyway, I cant seem to get my Unit test to pass, it keeps failing on the line

_emailService.Verify(e => e.SendMail(ContactUsDto.Email, ContactUsDto.Email, "User feedback", emailBody));

When I try to debug the test a box pops up saying MockException was unhandled by user code. if I gopy exception details to clipboard this is what I get:

Moq.MockException was unhandled by user code HResult=-2146233088 Message= Expected invocation on the mock at least once, but was never performed: e => e.SendMail(.ContactUsDto.Email, .ContactUsDto.Email, "User feedback", .emailBody) No setups configured. Performed invocations: IEmailService.SendMail("123@example.com", "contact", "Northern Safety co., inc. Automatic Response", "Name

Email

PhoneNumber

Street

City

State

PostCode

Comments

") Source=Moq IsVerificationError=true StackTrace: at Moq.Mock.ThrowVerifyException(MethodCall expected, IEnumerable1 setups, IEnumerable1 actualCalls, Expression expression, Times times, Int32 callCount) at Moq.Mock.VerifyCalls(Interceptor targetInterceptor, MethodCall expected, Expression expression, Times times) at Moq.Mock.Verify[T](Mock1 mock, Expression1 expression, Times times, String failMessage) at Moq.Mock1.Verify(Expression1 expression) at Coop.Services.Tests.ContactUsEmailServiceTests.SendEmail_WhenEmailIsSentAndNameIsNotAvailable_TheNameIsFilledWithDefaultValueInEmailBody() in c:\TFS\AppDev\Co-Op Training\Dev-Jordan\Src\Coop.Services.Tests\ContactUsEmailServiceTests.cs:line 75 InnerException:

Let me know if you need anything else. Thank you!!!!