Method: Object#stub

Defined in:
lib/minitest/mock.rb

#stub(name, val_or_callable, *block_args, **block_kwargs, &block) ⇒ Object

Add a temporary stubbed method replacing name for the duration of the block. If val_or_callable responds to #call, then it returns the result of calling it, otherwise returns the value as-is. If stubbed method yields a block, block_args will be passed along. Cleans up the stub at the end of the block. The method name must exist before stubbing.

def test_stale_eh
  obj_under_test = Something.new
  refute obj_under_test.stale?

  Time.stub :now, Time.at(0) do
    assert obj_under_test.stale?
  end
end

– NOTE: keyword args in callables are NOT checked for correctness against the existing method. Too many edge cases to be worth it.



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# File 'lib/minitest/mock.rb', line 298

def stub name, val_or_callable, *block_args, **block_kwargs, &block
  new_name = "__minitest_stub__#{name}"

  metaclass = class << self; self; end

  if respond_to? name and not methods.map(&:to_s).include? name.to_s then
    metaclass.send :define_method, name do |*args, **kwargs|
      super(*args, **kwargs)
    end
  end

  metaclass.send :alias_method, new_name, name

  if ENV["MT_KWARGS_HAC\K"] then
    metaclass.send :define_method, name do |*args, &blk|
      if val_or_callable.respond_to? :call then
        val_or_callable.call(*args, &blk)
      else
        blk.call(*block_args, **block_kwargs) if blk
        val_or_callable
      end
    end
  else
    metaclass.send :define_method, name do |*args, **kwargs, &blk|
      if val_or_callable.respond_to? :call then
        if kwargs.empty? then # FIX: drop this after 2.7 dead
          val_or_callable.call(*args, &blk)
        else
          val_or_callable.call(*args, **kwargs, &blk)
        end
      else
        if blk then
          if block_kwargs.empty? then # FIX: drop this after 2.7 dead
            blk.call(*block_args)
          else
            blk.call(*block_args, **block_kwargs)
          end
        end
        val_or_callable
      end
    end
  end

  block[self]
ensure
  metaclass.send :undef_method, name
  metaclass.send :alias_method, name, new_name
  metaclass.send :undef_method, new_name
end