# ----------- v1
def bla
end

def bli
end

bla = bli
# ----------- v1
class X
  def bla
  end
end

def bli
end

def foo
  X.alias_method bla, bli
end
# ------------ v3
def class Foo

  def list_reboots
  end

  def analyse_reboots
    list_reboots.each do ...
  end
end

def class Tester

  def scenario1
    return "boot1\nboot2\nboot3\n"
  end

  def do_test
    replace_class_FOOs_method(list_reboots, scenario1)
    Foo.analyse_reboots
  end
end