Question

我不是用ruby语法编写的字符串，但是如果我在学习它时理解了一些东西，你可以做任何事情，没有限制，让我说我有一个类方法，我想在单元测试中重新定义它以隔离我正在测试的东西，我该怎么做？假设类名是foo，实例方法是bar。

Answer 1

Test::Redef是一个专门用来做这件事的宝石。

test "some method on Foo should be called because under normal circumstances it something useful like send network traffic" do
  Test::Redef.rd(
    'Foo#bar'  => proc {|args| puts 'new behavior goes here!'},
    'Foo#baz'  => :empty,   # same as => proc { }
    'Foo#quux' => :wiretap, # no behavior change but you get invocation tracking
    'Foo.blat' => :empty,   # class method
  ) do |rd|

    # code under test


    assert_equal [['invocation 1 arg 1', 'invocation 1 arg 2'], 
                  ['invocation 2 arg 1'],
                 ], rd[:bar].args, 'Foo#bar was called with the right arguments'
  end

  # now all methods are back to normal
end

重新定义单元测试的方法

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