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import { RatInAMaze } from '../RatInAMaze'

describe('RatInAMaze', () => {

it('should fail for non-arrays', () => {

const values = [undefined, null, {}, 42, 'hello, world']

for (const value of values) {

// we deliberately want to check whether this constructor call fails or not

// eslint-disable-next-line no-new

expect(() => { new RatInAMaze(value) }).toThrow()

}

})

it('should fail for an empty array', () => {

// we deliberately want to check whether this constructor call fails or not

// eslint-disable-next-line no-new

expect(() => { new RatInAMaze([]) }).toThrow()

})

it('should fail for a non-square array', () => {

const array = [

[0, 0, 0],

[0, 0]

]

// we deliberately want to check whether this constructor call fails or not

// eslint-disable-next-line no-new

expect(() => { new RatInAMaze(array) }).toThrow()

})

it('should fail for arrays containing invalid values', () => {

const values = [[[2]], [['a']]]

for (const value of values) {

// we deliberately want to check whether this constructor call fails or not

// eslint-disable-next-line no-new

expect(() => { new RatInAMaze(value) }).toThrow()

}

})

it('should work for a single-cell maze', () => {

const maze = new RatInAMaze([[1]])

expect(maze.solved).toBe(true)

expect(maze.path).toBe('')

})

it('should work for a single-cell maze that can not be solved', () => {

const maze = new RatInAMaze([[0]])

expect(maze.solved).toBe(false)

expect(maze.path).toBe('')

})

it('should work for a simple 3x3 maze', () => {

const maze = new RatInAMaze([[1, 1, 0], [0, 1, 0], [0, 1, 1]])

expect(maze.solved).toBe(true)

expect(maze.path).toBe('RDDR')

})

it('should work for a simple 2x2 that can not be solved', () => {

const maze = new RatInAMaze([[1, 0], [0, 1]])

expect(maze.solved).toBe(false)

expect(maze.path).toBe('')

})

it('should work for a more complex maze', () => {

const maze = new RatInAMaze([

[1, 1, 1, 1, 1, 0, 0],

[0, 0, 0, 0, 1, 0, 0],

[1, 1, 1, 0, 1, 0, 0],

[1, 0, 1, 0, 1, 0, 0],

[1, 0, 1, 1, 1, 0, 0],

[1, 0, 0, 0, 0, 0, 0],

[1, 1, 1, 1, 1, 1, 1]

])

expect(maze.solved).toBe(true)

expect(maze.path).toBe('RRRRDDDDLLUULLDDDDRRRRRR')

})

it('should work for a more complex maze that can not be solved', () => {

const maze = new RatInAMaze([

[1, 1, 1, 1, 1, 0, 1],

[0, 0, 0, 0, 1, 0, 1],

[1, 1, 1, 0, 1, 0, 1],

[1, 0, 1, 0, 1, 0, 1],

[1, 0, 1, 0, 1, 1, 1],

[1, 0, 0, 0, 0, 0, 0],

[1, 1, 1, 1, 1, 1, 1]

])

expect(maze.solved).toBe(false)

expect(maze.path).toBe('')

})

})