acronymize.rb

def acronymizer(sentence)
  sentence.split.map { |word| word[0] }.join.upcase
end

describe "#acronymizer" do
  it "Test case with empty sentence" do
    actual = acronymizer("")

    expect(actual).to eq("")
  end

  it "Test case with 'way too fast bitch'" do
    actual = acronymizer("way too fast bitch")

    expect(actual).to eq("WTFB")
  end
end