Starships

OfficerEvaluator.cs

using System;
using Starships.Models;

namespace Starships
{
    public interface IOfficerEvaluator
    {
        bool Evaluate(IOfficer officer);
    }

    public class OfficerEvaluator : IOfficerEvaluator
    {
        public IOfficer Officer;
        public OfficerEvaluator()
        {
        }

        public bool Evaluate(IOfficer officer)
        {
            if (officer.Grade == 'A')
            {
                return true;
            }
            else { throw new Exception("Unacceptable officer"); }
        }
    }
}

OfficerEvaluatorShould.cs

using System;
using Xunit;
using Moq;
using Starships;
using Starships.Models;

namespace Starships.Tests
{

    public class OfficerEvaluatorShould
    {
        [Theory]
        [InlineData('A')]
        public void ApproveGoodOfficers(char grade)
        {
            var officer = new Mock<IOfficer>();
            officer.Setup(x => x.Grade).Returns(grade);
            OfficerEvaluator sut = new OfficerEvaluator();
            Assert.True(sut.Evaluate(officer.Object));
        }

        [Theory]
        [InlineData('B')]
        [InlineData('C')]
        [InlineData('D')]
        [InlineData('F')]
        public void ThrowOnPoorOfficers(char grade)
        {
            var officer = new Mock<IOfficer>();
            officer.Setup(x => x.Grade).Returns(grade);
            OfficerEvaluator sut = new OfficerEvaluator();
            //Assert.Throws<Exception>(sut.Evaluate(officer.Object));
            Assert.Throws<Exception>(() => sut.Evaluate(officer.Object));
        }
    }
}

Starships.Models.cs

using System;

namespace Starships.Models
{
    public interface IOfficer
    {
        string FirstName { get; set; }
        string LastName { get; set; }
        DateTime BirthDate { get; set; }
        char Grade { get; set; }
        string Name { get; }
    }

    public interface IStarship
    {
        string Name { get; set; }
        string Registry { get; set; }
        int Crew { get; set; }
        StarshipClass StarshipClass { get; set; }
        IOfficer Captain { get; set; }
    }

    public class Officer : IOfficer
    {
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public DateTime BirthDate { get; set; }
        public string Name { get { return $"{FirstName} {LastName}"; } }
        public char Grade { get; set; }

    }

    public class Starship : IStarship
    {
        public string Name { get; set; }
        public string Registry { get; set; }
        public int Crew { get; set; }
        public StarshipClass StarshipClass { get; set; }
        public IOfficer Captain { get; set; }

    }
}