{
  "exercise": "book-store",
  "version": "1.2.0",
  "cases": [
    {
      "description": "Return the total basket price after applying the best discount.",
      "comments": [
        "Calculate lowest price for a shopping basket containing books only from ",
        "a single series.  There is no discount advantage for having more than ",
        "one copy of any single book in a grouping."
      ],
      "cases": [
        {
         "property": "total",
         "description": "Only a single book",
         "comments": ["Suggested grouping, [[1]]."],
         "input": {
           "basket": [1]
         },
         "expected": 8.00
        },
        {
         "property": "total",
         "description": "Two of the same book",
         "comments": ["Suggested grouping, [[2],[2]]."],
         "input": {
           "basket": [2,2]
         },
         "expected": 16.00
        },
        {
         "property": "total",
         "description": "Empty basket",
         "comments": ["Suggested grouping, []."],
         "input": {
           "basket": []
         },
         "expected": 0.00
        },
        {
         "property": "total",
         "description": "Two different books",
         "comments": ["Suggested grouping, [[1,2]]."],
         "input": {
           "basket": [1,2]
         },
         "expected": 15.20
        },
        {
         "property": "total",
         "description": "Three different books",
         "comments": ["Suggested grouping, [[1,2,3]]."],
         "input": {
           "basket": [1,2,3]
         },
         "expected": 21.60
        },
        {
         "property": "total",
         "description": "Four different books",
         "comments": ["Suggested grouping, [[1,2,3,4]]."],
         "input": {
           "basket": [1,2,3,4]
         },
         "expected": 25.60
        },
        {
         "property": "total",
         "description": "Five different books",
         "comments": ["Suggested grouping, [[1,2,3,4,5]]."],
         "input": {
           "basket": [1,2,3,4,5]
         },
         "expected": 30.00
        },
        {
         "property": "total",
         "description": "Two groups of four is cheaper than group of five plus group of three",
         "comments": ["Suggested grouping, [[1,2,3,4],[1,2,3,5]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,5]
         },
         "expected": 51.20
        },
        {
         "property": "total",
         "description": "Group of four plus group of two is cheaper than two groups of three",
         "comments": ["Suggested grouping, [[1,2,3,4],[1,2]]."],
         "input": {
           "basket": [1,1,2,2,3,4]
         },
         "expected": 40.80
        },
        {
         "property": "total",
         "description": "Two each of first 4 books and 1 copy each of rest",
         "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,4,5]
         },
         "expected": 55.60
        },
        {
         "property": "total",
         "description": "Two copies of each book",
         "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,4,5,5]
         },
         "expected": 60.00
        },
        {
         "property": "total",
         "description": "Three copies of first book and 2 each of remaining",
         "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5],[1]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,4,5,5,1]
         },
         "expected": 68.00
        },
        {
         "property": "total",
         "description": "Three each of first 2 books and 2 each of remaining books",
         "comments": ["Suggested grouping, [[1,2,3,4,5],[1,2,3,4,5],[1,2]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,4,5,5,1,2]
         },
         "expected": 75.20
        },
        {
         "property": "total",
         "description": "Four groups of four are cheaper than two groups each of five and three",
         "comments": ["Suggested grouping, [[1,2,3,4],[1,2,3,5],[1,2,3,4],[1,2,3,5]]."],
         "input": {
           "basket": [1,1,2,2,3,3,4,5,1,1,2,2,3,3,4,5]
         },
         "expected": 102.4
        }
     ]
    }
  ]
}