public IEnumerable <BrandBoardGroup> GroupBrandData(IEnumerable <BrandBoardItem> items)
{
// group items by rule from customised group utility
// groupItemNumber is optional parameter. It is futureproof consideration for different groupping rule
// "others" tag is replaced with "z" to make it alway display at last.
var groups = items
.GroupBy(l => GroupUtility.GetGroupName(l.BrandName, groupItemNumber: 2))
.OrderBy(l => l.Key.Replace("Others", "z"));
var result = new List <BrandBoardGroup>();
foreach (var group in groups)
{
// loop group and sort items in each group with custimised rule
// the order in given example does not meet any unified rule from my humble option
// here is a temp rule to match the example
// rule1: case is not sensitive
// rule2: if words start with b/e/l [space] is sorted like "s"
// rule3: "ABC" is after "ABCD"
var resultItem = new BrandBoardGroup()
{
GroupName = group.Key,
Items = group.ToList()
.OrderBy(l => ("BEL".Contains(l.BrandName[0]) ? l.BrandName.Replace(" ", "s") : (l.BrandName + "{")), StringComparer.OrdinalIgnoreCase)
};
result.Add(resultItem);
}
return(result);
}
public void GetGroupName_CustomizedGroupItemNumber3_ReturnRightName()
{
// Arrange
string itemName = "A2";
// Act
var result = GroupUtility.GetGroupName(itemName, 3);
// Assert
Assert.Equal("A-C", result);
}
public void GetGroupName_BoundaryGroupItemNumber3_ReturnRightName()
{
// Arrange
string itemName = "Zoo";
// Act
var result = GroupUtility.GetGroupName(itemName, 2);
// Assert
Assert.Equal("Y-Z", result);
}
public void GetGroupName_DefaultGroupItemNumber_ReturnRightName()
{
// Arrange
string itemName = "A2";
// Act
var result = GroupUtility.GetGroupName(itemName);
// Assert
Assert.Equal("A-B", result);
}