just/test/function-flip/index.js at master · hmmhmmhm/just

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var test = require('../util/test')(__filename);

var flip = require('../../packages/function-flip');

test('flips the first two args', function(t) {

t.plan(1);

var flippedArray = flip(Array);

t.same(flippedArray(0, 1), [1, 0]);

t.end();

});

test('includes the rest of the args in original order', function(t) {

t.plan(1);

var flippedArray = flip(Array);

t.same(flippedArray(2, 3, 5, 8, 13), [3, 2, 5, 8, 13]);

t.end();

});

test('does nothing with zero arity functions', function(t) {

t.plan(1);

function fn() {

return 21;

}

t.equal(21, flip(fn)(34));

t.end();

});

test('still flips the first two args of a variadic function', function(t) {

t.plan(1);

function pair() {

return [].slice.call(arguments, 0, 2);

}

t.same([55, 89], flip(pair)(89, 55));

t.end();

});