62 строки
1.5 KiB
JavaScript
62 строки
1.5 KiB
JavaScript
require("../env");
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var vows = require("vows"),
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assert = require("assert");
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var suite = vows.describe("d3.timer");
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suite.addBatch({
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"timer": {
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topic: function() {
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return d3.timer;
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},
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"with no delay": {
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topic: timer(),
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"first calls after 17 ms or less": function(info) {
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assert.inDelta(info.start - info.scheduled, 17, 20);
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},
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"calls until the function returns true": function(info) {
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assert.equal(info.count, 4);
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},
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"calls every 17 ms": function(info) {
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assert.inDelta(info.stop - info.start, 17 * 3, 20);
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}
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},
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"with a specified delay": {
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topic: timer(250),
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"first calls after the delay": function(info) {
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assert.inDelta(info.start - info.scheduled, 250, 20);
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},
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"calls until the function returns true": function(info) {
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assert.equal(info.count, 4);
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},
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"calls every 17 ms": function(info) {
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assert.inDelta(info.stop - info.start, 17 * 3, 20);
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}
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}
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}
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});
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function timer(delay) {
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var args = Array.prototype.slice.call(arguments);
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return function() {
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var cb = this.callback,
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info = {scheduled: Date.now(), count: 0};
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args.unshift(function() {
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var count = ++info.count;
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if (count === 1) {
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info.start = Date.now();
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} else if (count === 4) {
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info.stop = Date.now();
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cb(null, info);
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return true;
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}
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});
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d3.timer.apply(this, args);
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};
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}
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suite.export(module);
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