Add ETL exercise canonical data

Author: bunnymatic

exercises/etl/canonical-data.json

@@ -0,0 +1,62 @@
+{
+  "transform": {
+    "description": "transforms the a set of scrabble data previously indexed by the tile score to a set of data indexed by the tile letter",
+    "cases": [
+      {
+        "description": "a single letter",
+        "input": {
+          "1": ["A"]
+        },
+        "expected": {
+          "a" : 1
+        }
+      },
+      {
+        "description": "single score with multiple letters",
+        "input": {
+          "1": ["A", "E", "I", "O", "U" ]
+        },
+        "expected": {
+          "a" : 1,
+          "e" : 1,
+          "i" : 1,
+          "o" : 1,
+          "u" : 1
+        }
+      },
+      {
+        "description": "multiple scores with multiple letters",
+        "input": {
+          "1": ["A", "E"],
+          "2": ["D", "G"]
+        },
+        "expected": {
+          "a" : 1,
+          "e" : 1,
+          "d" : 2,
+          "g" : 2
+        }
+      },
+      {
+        "description": "multiple scores with differing numbers of letters",
+        "input": {
+          "1": [ "A", "E", "I", "O", "U", "L", "N", "R", "S", "T" ],
+          "2": [ "D", "G" ],
+          "3": [ "B", "C", "M", "P" ],
+          "4": [ "F", "H", "V", "W", "Y" ],
+          "5": [ "K" ],
+          "8": [ "J", "X" ],
+          "10": [ "Q", "Z" ]
+        },
+        "expected": {
+          "a": 1, "b": 3,  "c": 3, "d": 2, "e": 1,
+          "f": 4, "g": 2,  "h": 4, "i": 1, "j": 8,
+          "k": 5, "l": 1,  "m": 3, "n": 1, "o": 1,
+          "p": 3, "q": 10, "r": 1, "s": 1, "t": 1,
+          "u": 1, "v": 4,  "w": 4, "x": 8, "y": 4,
+          "z": 10
+        }
+      }
+    ]
+  }
+}