27 lines
491 B
JavaScript
27 lines
491 B
JavaScript
|
var assert = require('assert');
|
||
|
|
var Lazy = require('..');
|
||
|
|
var expresso = expresso;
|
||
|
|
|
||
|
|
function range(i, j) {
|
||
|
|
var r = [];
|
||
|
|
for (;i<j;i++) r.push(i);
|
||
|
|
return r;
|
||
|
|
}
|
||
|
|
|
||
|
|
exports['head'] = function () {
|
||
|
|
var lazy = new Lazy;
|
||
|
|
var data = [];
|
||
|
|
var executed = 0;
|
||
|
|
lazy.head(function (x) {
|
||
|
|
assert.equal(x, 0);
|
||
|
|
executed++;
|
||
|
|
})
|
||
|
|
|
||
|
|
range(0,10).forEach(function (x) {
|
||
|
|
lazy.emit('data', x);
|
||
|
|
});
|
||
|
|
|
||
|
|
assert.equal(executed, 1, 'head executed too much');
|
||
|
|
}
|
||
|
|
|