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var S = require('sanctuary');
var R = require('../source');var Id = require('./shared/Id');var eq = require('./shared/eq');

describe('traverse', function() {
  it('operates on a list of lists', function() {    eq(R.traverse(R.of, R.map(R.add(10)), []), [[]]);    eq(R.traverse(R.of, R.map(R.add(10)), [[], [1, 2, 3, 4]]), []);    eq(R.traverse(R.of, R.map(R.add(10)), [[1], [2, 3, 4]]), [[11, 12], [11, 13], [11, 14]]);    eq(R.traverse(R.of, R.map(R.add(10)), [[1, 2], [3, 4]]), [[11, 13], [11, 14], [12, 13], [12, 14]]);    eq(R.traverse(R.of, R.map(R.add(10)), [[1, 2, 3], [4]]), [[11, 14], [12, 14], [13, 14]]);    eq(R.traverse(R.of, R.map(R.add(10)), [[1, 2, 3, 4], []]), []);  });
  it('operates on a list of applicatives', function() {    eq(R.traverse(S.Maybe.of, R.map(R.add(10)), [S.Just(3), S.Just(4), S.Just(5)]), S.Just([13, 14, 15]));    eq(R.traverse(S.Maybe.of, R.map(R.add(10)), [S.Just(3), S.Nothing(), S.Just(5)]), S.Nothing());  });
  it('traverses left to right', function() {    eq(R.traverse(S.Either.of, R.identity, [S.Right(1), S.Right(2)]), S.Right([1, 2]));    eq(R.traverse(S.Either.of, R.identity, [S.Right(1), S.Left('XXX')]), S.Left('XXX'));    eq(R.traverse(S.Either.of, R.identity, [S.Left('XXX'), S.Right(1)]), S.Left('XXX'));    eq(R.traverse(S.Either.of, R.identity, [S.Left('XXX'), S.Left('YYY')]), S.Left('XXX'));  });
  it('dispatches to `traverse` method', function() {    const mockTraversable = { traverse(_1, _2) { return 'traverse called'; } };
    eq(R.traverse(Id, R.identity, mockTraversable), 'traverse called');  });
  it('dispatches to `fantasy-land/traverse` method', function() {    const mockTraversable2 = {      ['fantasy-land/traverse'](_1, _2) { return 'fantasy-land/traverse called'; }    };    eq(R.traverse(Id, R.identity, mockTraversable2), 'fantasy-land/traverse called');  });
  it('dispatches to `fantasy-land/traverse` method when it and `traverse` exist', function() {    const mockTraversable3 = {      traverse(_1, _2) { return 'traverse called'; },      ['fantasy-land/traverse'](_1, _2) { return 'fantasy-land/traverse called'; }    };    eq(R.traverse(Id, R.identity, mockTraversable3), 'fantasy-land/traverse called');  });
  it('dispatches to `traverse` when it exists and `fantasy-land/traverse` is not a function', function() {    const mockTraversable4 = {      traverse(_1, _2) { return 'traverse called'; },      'fantasy-land/traverse': new Error()    };    eq(R.traverse(Id, R.identity, mockTraversable4), 'traverse called');  });
});