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Merged
pomkarnath98 merged 3 commits into from
Oct 3, 2021
Merged

Add proper test to Backtracking/Sudoku #713

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Add proper test to Backtracking/Sudoku
defaude Oct 2, 2021
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defaude Oct 3, 2021
2b3db6c
Apply standard code style
defaude Oct 3, 2021
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24 changes: 1 addition & 23 deletions Backtracking/Sudoku.js
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Original file line number Diff line number Diff line change
Expand Up @@ -72,26 +72,4 @@ class Sudoku {
}
}

function main () {
// main function with an example
const sudokuBoard = new Sudoku([
[3, 0, 6, 5, 0, 8, 4, 0, 0],
[5, 2, 0, 0, 0, 0, 0, 0, 0],
[0, 8, 7, 0, 0, 0, 0, 3, 1],
[0, 0, 3, 0, 1, 0, 0, 8, 0],
[9, 0, 0, 8, 6, 3, 0, 0, 5],
[0, 5, 0, 0, 9, 0, 6, 0, 0],
[1, 3, 0, 0, 0, 0, 2, 5, 0],
[0, 0, 0, 0, 0, 0, 0, 7, 4],
[0, 0, 5, 2, 0, 6, 3, 0, 0]
])

sudokuBoard.printBoard()

console.log('\n')
sudokuBoard.solve()

sudokuBoard.printBoard()
}

main()
export { Sudoku }
54 changes: 54 additions & 0 deletions Backtracking/tests/Sudoku.test.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,54 @@
import { Sudoku } from '../Sudoku'

const data = [
[3, 0, 6, 5, 0, 8, 4, 0, 0],
[5, 2, 0, 0, 0, 0, 0, 0, 0],
[0, 8, 7, 0, 0, 0, 0, 3, 1],
[0, 0, 3, 0, 1, 0, 0, 8, 0],
[9, 0, 0, 8, 6, 3, 0, 0, 5],
[0, 5, 0, 0, 9, 0, 6, 0, 0],
[1, 3, 0, 0, 0, 0, 2, 5, 0],
[0, 0, 0, 0, 0, 0, 0, 7, 4],
[0, 0, 5, 2, 0, 6, 3, 0, 0]
]

const solved = [
[3, 1, 6, 5, 7, 8, 4, 9, 2],
[5, 2, 9, 1, 3, 4, 7, 6, 8],
[4, 8, 7, 6, 2, 9, 5, 3, 1],
[2, 6, 3, 4, 1, 5, 9, 8, 7],
[9, 7, 4, 8, 6, 3, 1, 2, 5],
[8, 5, 1, 7, 9, 2, 6, 4, 3],
[1, 3, 8, 9, 4, 7, 2, 5, 6],
[6, 9, 2, 3, 5, 1, 8, 7, 4],
[7, 4, 5, 2, 8, 6, 3, 1, 9]
]

describe('Sudoku', () => {
it('should create a valid board successfully', () => {
// we deliberately want to check whether this constructor call fails or not
// eslint-disable-next-line no-new
expect(() => { new Sudoku(data) }).not.toThrow()
})

it('should find an empty cell', () => {
const board = new Sudoku(data)
const emptyCell = board.findEmptyCell()
expect(emptyCell).not.toEqual([-1, -1])
})

it('should solve the board successfully', () => {
const board = new Sudoku(data)
board.solve()

// should not have empty cells anymore
const emptyCell = board.findEmptyCell()
expect(emptyCell).toEqual([-1, -1])

// solved board should match our expectation
for (let i = 0; i < 9; i++) {
const section = board.getSection(i, [0, 9])
expect(section).toEqual(solved[i])
}
})
})