An interesting Ruby problem

my_hash.rb

class MyHash < Hash
  undef_method :fetch
  
  def fetch(*)
    # your code goes here
  end
end

require "rspec/autorun"

describe MyHash do
  subject{ MyHash[:key, :value] }
  context "#fetch" do
    it "returns value when key is present" do
      expect(subject.fetch(:key)).to eq(:value)
    end

    it "returns value when key is present regardless other arguments" do
      expect(subject.fetch(:key, :lol){ :wut }).to eq(:value)
    end

    it "raises ArgumentError when too many arguments are provided" do
      expect{ subject.fetch(:lol, :wut, :fizz) }.to raise_error(ArgumentError)
    end

    it "throws an error when key is not present" do
      expect{ subject.fetch(:lol) }.to raise_error(KeyError)
    end

    it "returns a provided value if key is not present" do
      expect(subject.fetch(:lol, :another_value)).to eq(:another_value)
    end

    it "returns nil when it's provided as a value" do
      expect(subject.fetch(:lol, nil)).to eq(nil)
    end

    it "executes block when key is not present" do
      expect(subject.fetch(:lol){ :another_value }).to eq(:another_value)
    end

    it "executes block if both block and default value are provided" do
      expect(subject.fetch(:lol, :wut){ :another_value }).to eq(:another_value)
    end
  end
end