void ListPoemsByTitle_VerifyCorrectSpecificationIsUsed()
{
//Arrange
var mockRepository = new Mock <IEntityRepository <Poem> >();
mockRepository.Setup(r => r.List(It.IsAny <ListPoemsByTitleSpec>()));
//Act
var service = new ListPoemsService(mockRepository.Object);
var testResult = service.ListPoemsByTitle();
//Assert
mockRepository.Verify(r => r.List(It.IsAny <ListPoemsByTitleSpec>()));
}
void ListPoemsByTitle_RepositoryReturnsNull_ExpectEmptyPoemDTOList()
{
//Arrange
var mockRepository = new Mock <IEntityRepository <Poem> >();
mockRepository.Setup(r => r.List(It.IsAny <ListPoemsByTitleSpec>()))
.Returns((IEnumerable <Poem>)null);
//Act
var service = new ListPoemsService(mockRepository.Object);
var testResult = service.ListPoemsByTitle();
//Assert
var expectResult = new List <PoemDTO>();
Assert.Equal(expectResult, testResult);
}
void ListPoemsByTitle_RepositoryReturnsPoemList_ExpectPoemDTOList()
{
//Arrange
var poemList = new PoemBuilder().Default().BuildCollection(size: 3);
var mockRepository = new Mock <IEntityRepository <Poem> >();
mockRepository.Setup(r => r.List(It.IsAny <ListPoemsByTitleSpec>()))
.Returns(poemList);
//Act
var service = new ListPoemsService(mockRepository.Object);
var testResult = service.ListPoemsByTitle();
//Assert
var expectResult = poemList.Select(p => PoemDTO.CreateDTOFromEntity(p));
Assert.Equal(expectResult.Count(), testResult.Count());
}