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tanga

0.7.0
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Sexier strings for Elixir

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tanga spec next_spec.exs
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spec/next_spec.exs 

defmodule NextSpec do

  use ESpec



  describe "Tanga.next" do

    xit "returns an empty string for empty strings" do

      expect Tanga.next("") |> to(eq "")

    end

    

    it "returns the successor by increasing the rightmost alphanumeric (digit => digit, letter => letter with same case)" do

      expect Tanga.next("abcd") |> to(eq "abce")

      expect Tanga.next("THX1138") |> to(eq "THX1139")



      expect Tanga.next("<<koala>>") |> to(eq "<<koalb>>")

      # expect Tanga.next("==A??") |> to(eq "==B??")

    end

    

    xit "increases non-alphanumerics (via ascii rules) if there are no alphanumerics" do

      expect Tanga.next("***") |> to(eq "**+")

      expect Tanga.next("**`") |> to(eq "**a")

    end

    

    xit "increases the next best alphanumeric (jumping over non-alphanumerics) if there is a carry" do

      expect Tanga.next("dz") |> to(eq "ea")

      expect Tanga.next("HZ") |> to(eq "IA")

      expect Tanga.next("49") |> to(eq "50")

      

      expect Tanga.next("izz") |> to(eq "jaa")

      expect Tanga.next("IZZ") |> to(eq "JAA")

      expect Tanga.next("699") |> to(eq "700")

      

      expect Tanga.next("6Z99z99Z") |> to(eq "7A00a00A")

      

      expect Tanga.next("1999zzz") |> to(eq "2000aaa")

      expect Tanga.next("NZ/[]ZZZ9999") |> to(eq "OA/[]AAA0000")

    end

    

    xit "increases the next best character if there is a carry for non-alphanumerics" do

      expect Tanga.next("(\xFF") |> to(eq ")\x00")

      expect Tanga.next("`\xFF") |> to(eq "a\x00")

      expect Tanga.next("<\xFF\xFF") |> to(eq "=\x00\x00")

    end

    

    xit "adds an additional character (just left to the last increased one) if there is a carry and no character left to increase" do

      expect Tanga.next("z") |> to(eq "aa")

      expect Tanga.next("Z") |> to(eq "AA")

      expect Tanga.next("9") |> to(eq "10")



      expect Tanga.next("zz") |> to(eq "aaa")

      expect Tanga.next("ZZ") |> to(eq "AAA")

      expect Tanga.next("99") |> to(eq "100")

      

      expect Tanga.next("9Z99z99Z") |> to(eq "10A00a00A")



      expect Tanga.next("ZZZ9999") |> to(eq "AAAA0000")

      expect Tanga.next("/[]9999") |> to(eq "/[]10000")

      expect Tanga.next("/[]ZZZ9999") |> to(eq "/[]AAAA0000")

      expect Tanga.next("Z/[]ZZZ9999") |> to(eq "AA/[]AAA0000")



      # non-alphanumeric cases

      expect Tanga.next("\xFF") |> to(eq "\x01\x00")

      expect Tanga.next("\xFF\xFF") |> to(eq "\x01\x00\x00")

    end

  end

end