public async Task GetNameByIdAsync_ReturnsTheNameOrThrowsException()
{
var context = ApplicationDbContextInMemoryFactory.InitializeContext();
var subCategoryRepository = new EfDeletableEntityRepository <SubCategory>(context);
var subCategoryService = new SubCategoryService(subCategoryRepository);
var subCategoryTestSeeder = new SubCategoryTestSeeder();
await subCategoryTestSeeder.SeedSubCategories(context);
var actualName = await subCategoryService.GetNameByIdAsync("1");
Assert.Equal("SubCategory1", actualName);
await Assert.ThrowsAsync <ArgumentNullException>(async() =>
{
await subCategoryService.GetNameByIdAsync("invalid");
});
}