criminalmindsapi/server.tests/v1/unitTests/CharactersControllerUnitTests.cs

using FluentAssertions;
using Microsoft.AspNetCore.Mvc;
using Moq;
using server.Controllers.v1;
using server.Models;
using server.Persistence.Repositories;
using System.Net;

namespace server.tests.v1.UnitTests
{
    public class CharactersControllerUnitTests
    {
        private readonly Mock<ICharacterRepository> _mockRepo;
        private readonly CharactersController _controller;

        public CharactersControllerUnitTests()
        {
            _mockRepo = new Mock<ICharacterRepository>();
            _controller = new CharactersController(_mockRepo.Object);
        }

        [Fact]
        public async Task GetCharactersAsync_AllCharacters_Returns200StatusCodeWithCharactersCollection()
        {
            var filter = new CharacterFilter();

            var characters = new List<Character> { new Character(), new Character() };

            _mockRepo
                .Setup(repo => repo.GetCharactersAsync(filter))
                .ReturnsAsync(characters);

            var response = await _controller.GetCharactersAsync(filter) as ObjectResult;
            var data = response.Value as List<Character>;

            _mockRepo.Verify(repo => repo.GetCharactersAsync(It.IsAny<CharacterFilter>()), Times.Once());

            response.Should().NotBeNull();
            response.Should().BeOfType<OkObjectResult>();
            response.StatusCode.Should().Be((int)HttpStatusCode.OK);

            data.Should().NotBeNull();
            data.Should().BeOfType<List<Character>>();
            data.Should().HaveCount(2);
        }

        [Fact]
        public async Task GetCharactersAsync_RepoThrowsException_Returns500StatusCodeWithProblemDetails()
        {
            var filter = new CharacterFilter();

            _mockRepo
                .Setup(repo => repo.GetCharactersAsync(filter))
                .Throws(new Exception());

            var response = await _controller.GetCharactersAsync(filter) as ObjectResult;

            var details = response.Value;

            _mockRepo.Verify(repo => repo.GetCharactersAsync(It.IsAny<CharacterFilter>()), Times.Once());

            response.Should().NotBeNull();
            response.Should().BeOfType<ObjectResult>();
            response.StatusCode.Should().Be((int)HttpStatusCode.InternalServerError);

            details.Should().NotBeNull();
            details.Should().BeOfType<ProblemDetails>();
        }

        [Fact]
        public async Task GetCharacterByIdAsync_ValidCharacterId_Returns200StatusCodeWithCharacter()
        {
            var characterId = "62b7d5506c1b407771829926";

            _mockRepo
                .Setup(repo => repo.GetCharacterByIdAsync(characterId))
                .ReturnsAsync(new Character());

            var response = await _controller.GetCharacterByIdAsync(characterId) as ObjectResult;

            var character = response.Value;

            _mockRepo.Verify(repo => repo.GetCharacterByIdAsync(It.IsAny<string>()), Times.Once());

            response.Should().NotBeNull();
            response.Should().BeOfType<OkObjectResult>();
            response.StatusCode.Should().Be((int)HttpStatusCode.OK);

            character.Should().NotBeNull();
            character.Should().BeOfType<Character>();
        }

        [Fact]
        public async Task GetCharacterByIdAsync_ValidCharacterIdForNonExistentCharacter_Returns404StatusCodeWithProblemDetails()
        {
            var characterId = "62b7d5506c1b407771829926";

            _mockRepo
                .Setup(repo => repo.GetCharacterByIdAsync(characterId))
                .ReturnsAsync(null as Character);

            var response = await _controller.GetCharacterByIdAsync(characterId) as ObjectResult;

            var details = response.Value;

            _mockRepo.Verify(repo => repo.GetCharacterByIdAsync(It.IsAny<string>()), Times.Once());

            response.Should().NotBeNull();
            response.Should().BeOfType<ObjectResult>();
            response.StatusCode.Should().Be((int)HttpStatusCode.NotFound);

            details.Should().NotBeNull();
            details.Should().BeOfType<ProblemDetails>();
        }


        [Fact]
        public async Task GetCharacterByIdAsync_RepoThrowsException_Returns500StatusCodeWithProblemDetails()
        {
            var characterId = "62b7d5506c1b407771829926";

            _mockRepo
                .Setup(repo => repo.GetCharacterByIdAsync(characterId))
                .Throws(new Exception());

            var response = await _controller.GetCharacterByIdAsync(characterId) as ObjectResult;

            var details = response.Value;

            _mockRepo.Verify(repo => repo.GetCharacterByIdAsync(It.IsAny<string>()), Times.Once());

            response.Should().NotBeNull();
            response.Should().BeOfType<ObjectResult>();
            response.StatusCode.Should().Be((int)HttpStatusCode.InternalServerError);

            details.Should().NotBeNull();
            details.Should().BeOfType<ProblemDetails>();
        }
    }
}