public void CreateArticleAndAddItToDb_WhenParametersAreCorrect()
{
// Arrange
var dbContextMock = new Mock <ApplicationDbContext>();
List <Article> articles = new List <Article>();
string articlieAuthor = "author";
string articleTitle = "title";
string articleContent = "content";
var articlesSetMock = new Mock <DbSet <Article> >().SetupData(articles);
dbContextMock.SetupGet(m => m.Articles).Returns(articlesSetMock.Object);
ArticleServices service = new ArticleServices(dbContextMock.Object);
// Act
service.AddArticle(articlieAuthor, articleTitle, articleContent);
// Assert
var article = dbContextMock.Object.Articles.Single();
Assert.AreEqual(articleTitle, article.Title);
Assert.AreEqual(articleContent, article.Content);
Assert.AreEqual(articlieAuthor, article.Author);
dbContextMock.Verify(m => m.SaveChanges(), Times.Once());
}