如何使用 casperjs evaluate to diff 2 strings and assert

Question

我有一个简单的测试，用于检查用户的配额在上传文件后是否正确更改。

casper.then(function() {
    quota_begin = this.evaluate(function() {
        return document.querySelector('.storage_used p').textContent;
    });
});

casper.then(function() {
    common.ACTIONS.uploadFile(casper);
});          

casper.then(function() {
    quota_changed = this.evaluate(function() {
        return document.querySelector('.storage_used p').textContent;
    });
    this.echo('Storage quota change: ' + quota_begin + ' => ' + quota_changed);
});

最后一个 echo 的输出给我：

Storage quota change: Upload quota 0B of 1GB used => Upload quota 192 KB of 1GB used

我想在测试中包含一个断言，当 quota_begin 和 quota_changed 实际上没有改变时该断言会失败。

类似于：

  test.assert(parseFloat(quota_changed) > parseFloat(quota_begin), "Quota was increased by file");

（无效）

有没有简单的方法来断言两者的差异？正则表达式？

Answer 1

编写一个简单的函数来解析该字符串中使用过的字节即可完成该任务：

function get_used_bytes(input) {
  var unit_dict = {'B':1,'KB':1024,'MB':1024*1024,'GB':1024*1024*1024}
  var ret = /Upload quota ([\d.]+)(\S+) of ([\d.]+)(\S+) used/g.exec(input)
  return ret[1] * unit_dict[ret[2]]
}

// get_used_bytes("Upload quota 192KB of 1GB used")
// 196608

test.assert(get_used_bytes(quota_changed) > get_used_bytes(quota_begin), "Quota was increased by file");

如何使用 casperjs evaluate to diff 2 strings and assert

How to use casperjs evaluate to diff 2 strings and assert

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