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test/examples/sudoku_test.exs

defmodule InPlace.Examples.SudokuTest do
use ExUnit.Case
alias InPlace.Examples.Sudoku
import CPSolver.Test.Helpers
describe "4x4" do
test "instance with two solutions" do
Sudoku.solve(Sudoku.instance4(), solution_handler: async_solution_handler())
solutions = flush()
assert length(solutions) == 2
assert Enum.all?(solutions, &Sudoku.check_solution/1)
end
defp async_solution_handler() do
fn solution -> send(self(), solution) end
end
end
end