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

describe('either', function() {  it('combines two boolean-returning functions into one', function() {    var even = function(x) {return x % 2 === 0;};    var gt10 = function(x) {return x > 10;};    var f = R.either(even, gt10);    eq(f(8), true);    eq(f(13), true);    eq(f(7), false);  });
  it('accepts functions that take multiple parameters', function() {    var between = function(a, b, c) {return a < b && b < c;};    var total20 = function(a, b, c) {return a + b + c === 20;};    var f = R.either(between, total20);    eq(f(4, 5, 8), true);    eq(f(12, 2, 6), true);    eq(f(7, 5, 1), false);  });
  it('does not evaluate the second expression if the first one is true', function() {    var T = function() { return true; };    var Z = function() { effect = 'Z got evaluated'; };    var effect = 'not evaluated';    R.either(T, Z)();    eq(effect, 'not evaluated');  });
  it('accepts fantasy-land applicative functors', function() {    var Just = S.Just;    var Nothing = S.Nothing;    eq(R.either(Just(true), Just(true)), Just(true));    eq(R.either(Just(true), Just(false)), Just(true));    eq(R.either(Just(false), Just(false)), Just(false));    eq(R.either(Just(true), Nothing()), Nothing());    eq(R.either(Nothing(), Just(false)), Nothing());    eq(R.either(Nothing(), Nothing()), Nothing());  });
});