Parameterized subject blocks for MiniTest

example.rb

describe DiceRoller do

  describe "initialization" do
     
    subject { ->(*dice) { DiceRoller.new(*dice) } } 

    it "accepts a single die" do
      die = Die.new(6)
      subject[die].dice.count.must_equal 1
    end

    it "accepts multiple dice" do
      die1, die2 = Array.new(2) { Die.new(6) }
      subject[die1, die2].dice.count.must_equal 2
    end

  end

end

ParameterizedSubjectBlocks.md

This is an example of writing parameterized subject blocks in MiniTest.

It also works with let declarations.