def convert(in_arabic)
  ""
end

describe "Converting arabic numbers to roman numerals" do
  context "Roman didn't have a 0" do
    it "converts 0 to a blank string" do
      expect(convert(0)).to eq("")
    end
  end
end

def convert(in_arabic)
  return "" if in_arabic.zero?
  "I"
end

describe "Converting arabic numbers to roman numerals" do
  context "Roman didn't have a 0" do
    it "converts 0 to a blank string" do
      expect(convert(0)).to eq("")
    end
  end

  it "converts 1 to I" do
    expect(convert(1)).to eq("I")
  end
end

Add second unit test, convert 1
Add second unit test, convert 1
