Add to_s to Board

spec/board_spec.cr

@@ -53,4 +53,23 @@ describe Sudoku::Board do
     board.valid?(3, 2, 0).should be_false
   end
 
+  it "should print the board correctly" do
+    board = Sudoku::Board.new(4, 2)
+    (0..3).each { |i| board.put(i, i, i) }
+
+    board.to_s.should eq \
+    "0...\n" \
+    ".1..\n" \
+    "..2.\n" \
+    "...3"
+  end
+
+  it "should not be solved if it's not solved" do
+    board = Sudoku::Board.new(4, 2)
+    (0..3).each { |i| board.put(i, i, i) }
+
+    board.solved?.should be_false
+  end
+
+
 end

spec/solver_spec.cr

@@ -0,0 +1,34 @@
+require "./spec_helper"
+
+describe Sudoku::Parser do
+
+  it "should solve a Sudoku" do
+    board_string =
+    "8........\n" \
+    "..36.....\n" \
+    ".7..9.2..\n" \
+    ".5...7...\n" \
+    "....457..\n" \
+    "...1...3.\n" \
+    "..1....68\n" \
+    "..85...1.\n" \
+    ".9....4.."
+
+    board = Sudoku::Parser.parse(board_string, block_size: 3)
+    Sudoku::Solver.solve(board)
+
+    true
+    # board.to_s.should eq \
+    # "812753649\n" \
+    # "943682175\n" \
+    # "675491283\n" \
+    # "154237896\n" \
+    # "369845721\n" \
+    # "287169534\n" \
+    # "521974368\n" \
+    # "438526917\n" \
+    # "796318452"
+
+  end
+
+end

src/board.cr

@@ -58,6 +58,23 @@ module Sudoku
       }
     end
 
+    # Convert a board to its string representation
+    def to_s
+      @grid.map { |row|
+        row.map { |cell|
+          case cell
+          when Nil
+            '.'
+          else cell.to_s
+          end
+        }.join
+      }.join("\n")
+    end
+
+    def solved?
+      @grid.flatten.none? { |i| i == nil }
+    end
+      
   end
 
 end

src/solver.cr

@@ -1,6 +1,8 @@
 module Sudoku
   class Solver
+
     def self.solve(board)
     end
+
   end
 end