public async Task AddTagToBookAsync_WithExistingBookTagRelation_ReturnsFalse()
{
// Arrange
var context = this.NewInMemoryDatabase();
var booksService = new BooksService(context);
var tag = new Tag();
var book = new Book();
await context.Tags.AddAsync(tag);
await context.Books.AddAsync(book);
await context.BookTags.AddAsync(new BookTag
{
BookId = book.Id,
TagId = tag.Id
});
await context.SaveChangesAsync();
// Act
var result = await booksService.AddTagToBookAsync(book.Id, tag.Id);
// Assert
Assert.False(result);
}
public async Task AddTagToBookAsync_WithCorrectIds_WorksCorrectly()
{
// Arrange
var context = this.NewInMemoryDatabase();
var booksService = new BooksService(context);
var tag = new Tag();
var book = new Book();
await context.Tags.AddAsync(tag);
await context.Books.AddAsync(book);
await context.SaveChangesAsync();
// Act
var result = await booksService.AddTagToBookAsync(book.Id, tag.Id);
// Assert
Assert.True(result);
Assert.True(await context.BookTags.AnyAsync(bt => bt.BookId == book.Id && bt.TagId == tag.Id));
}
public async Task AddTagToBookAsync_WithIncorrectBookId_ReturnsFalse()
{
// Arrange
var context = this.NewInMemoryDatabase();
var booksService = new BooksService(context);
var tag = new Tag();
var book = new Book();
var nonexistentBookId = Guid.NewGuid().ToString();
await context.Tags.AddAsync(tag);
await context.Books.AddAsync(book);
await context.SaveChangesAsync();
// Act
var result = await booksService.AddTagToBookAsync(nonexistentBookId, tag.Id);
// Assert
Assert.False(result);
Assert.False(await context.BookTags.AnyAsync(bt => bt.BookId == book.Id && bt.TagId == tag.Id));
}