Question

调试测试时，可以很容易地在其中放置一些IO.inspect语句来查看正在发生的事情。这很有效，直到对象变得太大。

运行mix时iex等同于IEx.configure [inspect: [limit: 1000]]的{{1}}是什么？

Answer 1

IEx.configure [inspect: [limit: 1000]]仅更改inspect对输入的每个表达式进行的iex自动IO.inspect调用的选项，并且不会更改实际IO.inspect函数的行为。您必须在IO.inspect周围创建一个包装，然后使用它而不是test "the truth" do list = Enum.to_list(1..100) IO.inspect list i list end defp i(item, opts \\ []) do IO.inspect(item, Keyword.put(opts, :limit, 1000)) end：

$ mix test
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
 43, 44, 45, 46, 47, 48, 49, 50, ...]
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42,
 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62,
 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82,
 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100]
.

Finished in 0.03 seconds
1 test, 0 failures

输出：

create table user_options
(   user_id int auto_increment primary key,
    email_sent_at date not null,
    days_gap int not null
);
insert user_options values
(1, '2016-07-27', 2),
(2, '2016-07-24', 2),
(3, '2016-07-22', 5),
(4, '2016-07-21', 3);

select * from user_options where email_sent_at < CURRENT_DATE - INTERVAL days_gap DAY;
+---------+---------------+----------+
| user_id | email_sent_at | days_gap |
+---------+---------------+----------+
|       2 | 2016-07-24    |        2 |
|       4 | 2016-07-21    |        3 |
+---------+---------------+----------+

IEx.configure等效于混合测试？

1 个答案: