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

describe('complement', function() {  it('creates boolean-returning function that reverses another', function() {    var even = function(x) {return x % 2 === 0;};    var f = R.complement(even);    eq(f(8), false);    eq(f(13), true);  });
  it('accepts a function that take multiple parameters', function() {    var between = function(a, b, c) {return a < b && b < c;};    var f = R.complement(between);    eq(f(4, 5, 11), false);    eq(f(12, 2, 6), true);  });
  it('accepts fantasy-land functors', function() {    var Just = S.Just;    var Nothing = S.Nothing;    eq(R.complement(Just(true)), Just(false));    eq(R.complement(Just(false)), Just(true));    eq(R.complement(Nothing()), Nothing());  });
});