public void TestArticleTitleAlreadyExists_WithNonExistingData_ShouldReturnFalse(string data)
{
var repository = new Mock <IDeletableEntityRepository <Article> >();
repository.Setup(r => r.All()).Returns(new List <Article>()
{
new Article {
Title = "Some Title"
},
new Article {
Title = "Second Title"
},
}.AsQueryable());
var service = new ArticlesService(repository.Object, new ImageService());
Assert.False(service.ArticleTitleAlreadyExists(data));
}