Ruby，两个对象数组的assert_equal

发布于 2024-10-21 01:56:07 字数 467 浏览 4 评论 0原文

我有以下情况。我正在尝试为对象数组编写单元测试。该对象的定义如下：

class Element
  attr_reader :title, :season, :episode

  def initialize ( name, number )
    @name = name
    @number = number
  end

  def to_s
    number = "%02d" % @number

    result = "Number " << number << " " << @name
    result
  end
end

在测试期间，我断言两个数组，它们都包含三个元素，元素相同，甚至顺序相同，但我仍然收到断言不相等的错误。我想我在这里遗漏了一些非常基本的东西，有什么问题吗？

如果我通过 to_s 方法比较每个元素，则断言是正确的..这是应该首先完成的方式吗？

原文

I have the following situation. I am trying to write a unit test for an array of objects. The object is defined something like this:

class Element
  attr_reader :title, :season, :episode

  def initialize ( name, number )
    @name = name
    @number = number
  end

  def to_s
    number = "%02d" % @number

    result = "Number " << number << " " << @name
    result
  end
end

During the test I assert two arrays which both contain three elements, the elements are identical and even the order is identical still I get an error that the assert isn't equal. I guess I am missing something really basic here, whats the catch?

If I compare each element by the to_s method, the assert is correct.. Is that the way it should be done in the first place?

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梦途 2024-10-28 01:56:07

尝试使用以下代码为您的类声明一个方法 == 。

def ==(other)
  self.to_s == other.to_s
end

旁注，您可能也想重构您的 to_s 方法，以获得一些简洁的代码。

def to_s
  "Number %02d #{@name}" % @number
end

编辑：

Numbers 已经定义了 == 方法（https://github.com/evanphx/rubinius/blob/master/kernel/bootstrap/fixnum.rb#L117）。

Ruby 通过对数组的每个元素运行 == 比较来比较数组。下面是数组上 == 的实现，如 Rubinius 中所做的那样（几乎完全用 Ruby 本身编写的 Ruby 实现）https://github.com/evanphx/rubinius/blob/master/kernel/common/array.rb#L474。

如果忽略各种错误检测，它基本上会递归地对数组的所有元素运行 == ，如果所有元素都匹配，则返回 true。

Try declaring a method == for your class, with the following code.

def ==(other)
  self.to_s == other.to_s
end

Sidenote, you might want to refactor your to_s method too, for some concise code.

def to_s
  "Number %02d #{@name}" % @number
end

Edit:

Numbers already have an == method defined (https://github.com/evanphx/rubinius/blob/master/kernel/bootstrap/fixnum.rb#L117).

Ruby compares arrays by running an == compare on each element of an Array. Here's the implementation of == on Arrays, as done in Rubinius (a Ruby implementation written almost completely in Ruby itself) https://github.com/evanphx/rubinius/blob/master/kernel/common/array.rb#L474.

If you leave out various error detections, it basically runs an == on all the elements of the array, recursively, and returns true if all of them match.

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