Parse sudoku boards from strings

spec/parse_spec.cr

@@ -0,0 +1,62 @@
+require "./spec_helper"
+
+describe Sudoku::Parser do
+
+  it "should parse an empty board" do
+    board_string = "....\n....\n....\n...."
+    board = Sudoku::Parser.parse(board_string, block_size: 2)
+    board.size.should eq 4
+    board.block_size.should eq 2
+
+    (0..3).each { |x|
+      (0..3).each { |y|
+        board.get(x, y).should eq nil
+      }
+    }
+  end
+
+  it "should raise an exception if number of rows and colums is different" do
+    expect_raises(Sudoku::ParseException) do
+      Sudoku::Parser.parse("....\n....", block_size: 2)
+    end
+  end
+
+  it "should put numbers correctly on the board" do
+    board_string = "1...\n.2..\n..3.\n...4"
+    board = Sudoku::Parser.parse(board_string, block_size: 2)
+
+    board.get(0,0).should eq 1
+    board.get(1,1).should eq 2
+    board.get(2,2).should eq 3
+    board.get(3,3).should eq 4
+  end
+
+  it "should raise an exception if a cell contains a character that is not a number or a dot" do
+    expect_raises(Sudoku::ParseException) do
+      Sudoku::Parser.parse(".A..\n....\n....\n....", block_size: 2)
+    end
+  end
+
+  it "should parse 9x9 boards correctly" 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)
+
+    board.get(0,0).should eq 8
+    board.get(2,1).should eq 3
+    board.get(3,1).should eq 6
+    board.get(1,2).should eq 7
+    board.get(4,2).should eq 9
+    board.get(8,8).should eq nil
+  end
+  
+end