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

describe('once', function() {  it('returns a function that calls the supplied function only the first time called', function() {    var ctr = 0;    var fn = R.once(function() {ctr += 1;});    fn();    eq(ctr, 1);    fn();    eq(ctr, 1);    fn();    eq(ctr, 1);  });
  it('passes along arguments supplied', function() {    var fn = R.once(function(a, b) {return a + b;});    var result = fn(5, 10);    eq(result, 15);  });
  it('retains and returns the first value calculated, even if different arguments are passed later', function() {    var ctr = 0;    var fn = R.once(function(a, b) {ctr += 1; return a + b;});    var result = fn(5, 10);    eq(result, 15);    eq(ctr, 1);    result = fn(20, 30);    eq(result, 15);    eq(ctr, 1);  });
  it('retains arity', function() {    var f = R.once(function(a, b) { return a + b; });    eq(f.length, 2);  });
});