使用 Mocha 进行模拟排序
如何模拟数组的排序并期望 lambda 表达式？
这是我的问题的一个简单例子：
# initializing the data
l = lambda { |a,b| a <=> b }
array = [ 1, 2, 3, 4, 5 ]
sorted_array = [ 2, 3, 8, 9, 1]
# I expect that sort will be called using the lambda as a parameter
array.expects(:sort).with( l ).returns( sorted_array )
# perform the sort using the lambda expression
temp = array.sort{|a,b| l.call(a,b) }
现在，一开始我预计这会起作用；但现在我已经意识到了。但是，我收到以下错误：
- expected exactly once, not yet invoked: [ 1, 2, 3, 4, 5 ].sort(#<Proc:0xb665eb48>)
我意识到这不起作用，因为 l 没有作为参数传递给 l。但是，还有其他方法可以完成此代码试图完成的任务吗？
注意：我已经弄清楚如何解决我的问题，但不知道如何执行上述操作。我会将其保留，以防其他人遇到类似的问题。
干杯， 约瑟夫
How can I mock an array's sort expect a lambda expression?
This is a trivial example of my problem:
# initializing the data
l = lambda { |a,b| a <=> b }
array = [ 1, 2, 3, 4, 5 ]
sorted_array = [ 2, 3, 8, 9, 1]
# I expect that sort will be called using the lambda as a parameter
array.expects(:sort).with( l ).returns( sorted_array )
# perform the sort using the lambda expression
temp = array.sort{|a,b| l.call(a,b) }
Now, at first I expected that this would work; however, I got the following error:
- expected exactly once, not yet invoked: [ 1, 2, 3, 4, 5 ].sort(#<Proc:0xb665eb48>)
I realize that this will not work because l is not passed as a parameter to l. However, is there another way to do what this code is trying to accomplish?
NOTE: I have figured out how to solve my issue without figuring out how to do the above. I will leave this open just in case someone else has a similar problem.
Cheers,
Joseph
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使用块来模拟方法可能会非常令人困惑。关键之一是明确你想要测试什么行为。我无法从您的示例代码中准确判断您要测试的内容。但是，您可能会找到 Mocha::Expectation#yields 的文档（甚至 Mocha::Expectation#multiple_yields）很有用。
Mocking methods with blocks can be quite confusing. One of the keys is to be clear about what behaviour you want to test. I can't tell from your sample code exactly what it is that you want to test. However, you might find the documentation for Mocha::Expectation#yields (or even Mocha::Expectation#multiple_yields) useful.