public async Task CategoryIdByNameTest()
{
var options = new DbContextOptionsBuilder <ApplicationDbContext>()
.UseInMemoryDatabase(databaseName: Guid.NewGuid().ToString()).Options;
var dbContext = new ApplicationDbContext(options);
dbContext.Categories.Add(new Category
{
Id = 1,
Name = "First",
});
dbContext.Categories.Add(new Category
{
Id = 2,
Name = "Second",
});
await dbContext.SaveChangesAsync();
var repository = new EfDeletableEntityRepository <Category>(dbContext);
var service = new CategoriesService(repository);
Assert.Equal(1, service.CategoryIdByName("First"));
Assert.Equal(2, service.CategoryIdByName("Second"));
}