public async Task AddTagsMethodShouldAddTagIdsToPost(string title, PostType type, string description, int categoryId)
{
var guid = Guid.NewGuid().ToString();
var options = new DbContextOptionsBuilder <ForumDbContext>()
.UseInMemoryDatabase(guid)
.Options;
var db = new ForumDbContext(options);
var dateTimeProvider = new Mock <IDateTimeProvider>();
dateTimeProvider.Setup(dtp => dtp.Now()).Returns(new DateTime(2020, 3, 27));
var post = new Post
{
Id = 1,
Title = title,
Description = description,
Type = type,
CategoryId = categoryId,
AuthorId = guid,
CreatedOn = dateTimeProvider.Object.Now()
};
await db.Posts.AddAsync(post);
await db.SaveChangesAsync();
var postsService = new PostsService(db, null, null, dateTimeProvider.Object);
var expectedIds = new[] { 1, 2, 3 };
await postsService.AddTagsAsync(1, expectedIds);
var actual = await db.Posts.FirstOrDefaultAsync();
var actualIds = actual.Tags.Select(t => t.TagId);
actualIds.Should().BeEquivalentTo(expectedIds);
}