defmodule AlphameticsTest do use ExUnit.Case # @tag :pending test "puzzle with three letters" do puzzle = "I + BB == ILL" solution = %{ ?I => 1, ?B => 9, ?L => 0 } assert Alphametics.solve(puzzle) == solution end @tag :pending test "solution must have unique value for each letter" do puzzle = "A == B" assert Alphametics.solve(puzzle) == nil end @tag :pending test "leading zero solution is invalid" do puzzle = "ACA + DD == BD" assert Alphametics.solve(puzzle) == nil end @tag :pending test "puzzle with two digits final carry" do puzzle = "A + A + A + A + A + A + A + A + A + A + A + B == BCC" solution = %{ ?A => 9, ?B => 1, ?C => 0 } assert Alphametics.solve(puzzle) == solution end @tag :pending test "puzzle with four letters" do puzzle = "AS + A == MOM" solution = %{ ?A => 9, ?S => 2, ?M => 1, ?O => 0 } assert Alphametics.solve(puzzle) == solution end @tag :pending test "puzzle with six letters" do puzzle = "NO + NO + TOO == LATE" solution = %{ ?N => 7, ?O => 4, ?T => 9, ?L => 1, ?A => 0, ?E => 2 } assert Alphametics.solve(puzzle) == solution end @tag :pending test "puzzle with seven letters" do puzzle = "HE + SEES + THE == LIGHT" solution = %{ ?E => 4, ?G => 2, ?H => 5, ?I => 0, ?L => 1, ?S => 9, ?T => 7 } assert Alphametics.solve(puzzle) == solution end @tag :pending test "puzzle with eight letters" do puzzle = "SEND + MORE == MONEY" solution = %{ ?S => 9, ?E => 5, ?N => 6, ?D => 7, ?M => 1, ?O => 0, ?R => 8, ?Y => 2 } assert Alphametics.solve(puzzle) == solution end @tag :pending @tag :slow test "puzzle with ten letters" do puzzle = "AND + A + STRONG + OFFENSE + AS + A + GOOD == DEFENSE" solution = %{ ?A => 5, ?D => 3, ?E => 4, ?F => 7, ?G => 8, ?N => 0, ?O => 2, ?R => 1, ?S => 6, ?T => 9 } assert Alphametics.solve(puzzle) == solution end @tag :pending @tag :slow test "puzzle with ten letters and 199 addends" do puzzle = "THIS + A + FIRE + THEREFORE + FOR + ALL + HISTORIES + I + TELL + A + " <> "TALE + THAT + FALSIFIES + ITS + TITLE + TIS + A + LIE + THE + TALE + " <> "OF + THE + LAST + FIRE + HORSES + LATE + AFTER + THE + FIRST + " <> "FATHERS + FORESEE + THE + HORRORS + THE + LAST + FREE + TROLL + " <> "TERRIFIES + THE + HORSES + OF + FIRE + THE + TROLL + RESTS + AT + " <> "THE + HOLE + OF + LOSSES + IT + IS + THERE + THAT + SHE + STORES + " <> "ROLES + OF + LEATHERS + AFTER + SHE + SATISFIES + HER + HATE + OFF + " <> "THOSE + FEARS + A + TASTE + RISES + AS + SHE + HEARS + THE + LEAST + " <> "FAR + HORSE + THOSE + FAST + HORSES + THAT + FIRST + HEAR + THE + " <> "TROLL + FLEE + OFF + TO + THE + FOREST + THE + HORSES + THAT + " <> "ALERTS + RAISE + THE + STARES + OF + THE + OTHERS + AS + THE + " <> "TROLL + ASSAILS + AT + THE + TOTAL + SHIFT + HER + TEETH + TEAR + " <> "HOOF + OFF + TORSO + AS + THE + LAST + HORSE + FORFEITS + ITS + " <> "LIFE + THE + FIRST + FATHERS + HEAR + OF + THE + HORRORS + THEIR + " <> "FEARS + THAT + THE + FIRES + FOR + THEIR + FEASTS + ARREST + AS + " <> "THE + FIRST + FATHERS + RESETTLE + THE + LAST + OF + THE + FIRE + " <> "HORSES + THE + LAST + TROLL + HARASSES + THE + FOREST + HEART + " <> "FREE + AT + LAST + OF + THE + LAST + TROLL + ALL + OFFER + THEIR + " <> "FIRE + HEAT + TO + THE + ASSISTERS + FAR + OFF + THE + TROLL + " <> "FASTS + ITS + LIFE + SHORTER + AS + STARS + RISE + THE + HORSES + " <> "REST + SAFE + AFTER + ALL + SHARE + HOT + FISH + AS + THEIR + " <> "AFFILIATES + TAILOR + A + ROOFS + FOR + THEIR + SAFE == FORTRESSES" solution = %{ ?A => 1, ?E => 0, ?F => 5, ?H => 8, ?I => 7, ?L => 2, ?O => 6, ?R => 3, ?S => 4, ?T => 9 } assert Alphametics.solve(puzzle) == solution end end