如何测试在Ruby中使用调用者的方法？

Question

I have a private method which returns something based on the caller method:

private
def aPrivateMethod
  r = nil
  caller_method = caller[0][/`([^']*)'/, 1]

  case caller_method
     when "method_1"
        r = "I was called by method_1"
     when "method_2"
        r = "I was called by method_2"
  end

  return r
end

When writing the test unit the method name calling this private method will not be method_1 nor method_2, it will be something beginning with test and I cannot find a solution to return a pass from the test.

Answer 1

Use a regex in the case expression:

def aPrivateMethod
  caller_method = caller[0][/`([^']*)'/, 1]

  case caller_method
     when "method_1"
        "I was called by method_1"
     when "method_2"
        "I was called by method_2"
     when /^test_\d+/
        "test call from #{caller_method}"
     else nil
  end
end

Also, you had a lot of superfluous code in there... the r variable is not needed at all.

Answer 2

You can create a proxy method in your test class for this purpose

def method_1 *args
  aPrivateMethod *args
end

And then call this method from your test.