ArticleServiceTests.cs

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using System.Collections.Generic;
using System.Linq;
using Microsoft.EntityFrameworkCore;
using Moq;
using ScientificReport.BLL.Services;
using ScientificReport.DAL.DbContext;
using ScientificReport.DAL.Entities.Publications;
using Xunit;

namespace ScientificReport.Test.ServicesTests
{
    public class ArticleServiceTests
    {
        private readonly Mock<DbSet<Article>> _mockDbSet = MockProvider.GetMockSet(GetTestData().AsQueryable());
        
        private static IEnumerable<Article> GetTestData()
        {
            return new[]
            {
                TestData.Article1,
                TestData.Article2
            };
        }
        
        private Mock<ScientificReportDbContext> GetMockContext()
        {
            var mockContext = new Mock<ScientificReportDbContext>();
            mockContext.Setup(item => item.Articles).Returns(_mockDbSet.Object);
            return mockContext;
        }

        [Fact]
        public void GetAllTest()
        {
            var list = GetTestData().AsQueryable();

            var mockContext = new Mock<ScientificReportDbContext>();
            mockContext.Setup(item => item.Articles).Returns(MockProvider.GetMockSet(list).Object);
            var service = new ArticleService(mockContext.Object);

            var actual = service.GetAll();

            Assert.Equal(list.Count(), actual.Count());
        }

        [Fact]
        public void GetAllWhereTest()
        {
            var service = new ArticleService(GetMockContext().Object);
            var actual = service.GetAllWhere(u => u.Id.Equals(TestData.Article1.Id));
            Assert.Single(actual);
        }

        [Fact]
        public void GetByIdTest()
        {
            var expected = GetTestData().First();
            var service = new ArticleService(GetMockContext().Object);

            var actual = service.GetById(expected.Id);
            
            Assert.NotNull(actual);
            Assert.Equal(expected.Id, actual.Id);
        }

        [Fact]
        public void CreateItemTest()
        {
            var service = new ArticleService(GetMockContext().Object);

            var expected = TestData.Article3;
            service.CreateItem(expected);

            _mockDbSet.Verify(m => m.Add(It.IsAny<Article>()), Times.Once);
        }

        [Fact]
        public void UpdateItemTest()
        {
            var service = new ArticleService(GetMockContext().Object);

            var expected = GetTestData().First();
            expected.Title = TestData.Article3.Title;
            service.UpdateItem(expected);

            _mockDbSet.Verify(m => m.Update(expected), Times.Once);
        }

        [Fact]
        public void DeleteItemTest()
        {
            var mockContext = GetMockContext();
            var service = new ArticleService(mockContext.Object);
    
            var item = mockContext.Object.Articles.First();
            
            Assert.True(service.Exists(item.Id));
            
            service.DeleteById(item.Id);

            Assert.False(service.Exists(item.Id));
        }

        [Fact]
        public void ExistsTest()
        {
            var service = new ArticleService(GetMockContext().Object);

            var item = GetTestData().First();
            var exists = service.Exists(item.Id);
            
            Assert.True(exists);
        }

        [Fact]
        public void DoesNotExistTest()
        {
            var service = new ArticleService(GetMockContext().Object);

            var item = TestData.Article3;
            var exists = service.Exists(item.Id);
            
            Assert.False(exists);
        }

        [Fact]
        public void GetAuthorsTest()
        {
            var service = new Mock<ArticleService>(GetMockContext().Object);

            var article = _mockDbSet.Object.FirstOrDefault();
            
            Assert.NotNull(article);

            var actual = service.Object.GetAuthors(article.Id);
            
            Assert.NotNull(actual);
            
            service.Verify(m => m.GetAuthors(article.Id), Times.Once);
        }

        [Fact]
        public void GetPageTest()
        {
            var service = new ArticleService(GetMockContext().Object);
            var expectedArticles = _mockDbSet.Object.AsQueryable();
            
            Assert.NotNull(expectedArticles);
            
            var count = expectedArticles.Count();
            var actualArticles = service.GetPage(1, count);
            
            Assert.NotNull(actualArticles);
            Assert.Equal(count, actualArticles.Count());
        }
        
        [Fact]
        public void GetCountTest()
        {
            var service = new ArticleService(GetMockContext().Object);
            var expectedArticles = _mockDbSet.Object.AsQueryable();
            
            Assert.Equal(expectedArticles.Count(), service.GetCount());
        }
    }
}