public void ByParent_Should_Throw_ArgumentNullException_If_Categories_Is_Null()
{
IQueryable<Category> categories = null;
Guid parentId = Guid.NewGuid();
var ex = Assert.Throws<ArgumentNullException>(() => CategoryExtensions.ByParent(categories, parentId));
Assert.Equal(nameof(categories), ex.ParamName);
}
public void ByParent_Should_Throw_ArgumentException_If_ParentId_Is_Empty()
{
var c1 = Category.Create("c1", "c1", "c1");
var c2 = Category.Create("c2", "c2", "c2");
var c3 = Category.Create("c3", "c3", "c3");
IQueryable<Category> categories = new Category[]
{
c1, c2, c3
}.AsQueryable();
Guid parentId = Guid.Empty;
var ex = Assert.Throws<ArgumentException>(() => CategoryExtensions.ByParent(categories, parentId));
Assert.Equal(nameof(parentId), ex.ParamName);
}
public void ByParent_Should_Return_Only_Categories_With_The_Specified_Parent()
{
var c1 = Category.Create("c1", "c1", "c1");
var c2 = Category.Create("c2", "c2", "c2");
var c3 = Category.Create("c3", "c3", "c3");
c2.SetParentCategory(c3);
IQueryable<Category> categories = new Category[]
{
c1, c2
}.AsQueryable();
Guid parentId = c3.Id;
var categoriesWithParent = CategoryExtensions.ByParent(categories, parentId).ToArray();
Assert.True(categoriesWithParent.All(c => c.Parent.Id == parentId));
}