How to assert certain method is called with Ruby minitest framework?

I want to test whether a function invokes other functions properly with minitest Ruby, but I cannot find a proper assert to test from the doc.

class SomeClass
  def invoke_function(name)
    name == "right" ? right () : wrong ()
  end

  def right
    #...
  end

  def wrong
    #...
  end
end

describe SomeClass do
  it "should invoke right function" do
    # assert right() is called
  end

  it "should invoke other function" do
    # assert wrong() is called
  end
end