Update the generator to use options and support a string-based map.

lib/link_shortener/generators/link_with_random_shorten.ex

@@ -7,8 +7,28 @@ defmodule LinkShortener.Generators.LinkWithRandomShorten do
 
   @doc """
   Generate a Link with random shorten with the length.
+
+  ## Options
+    • :is_atom_based (boolean, true by default) - if a map is
+      atom-based, then a key for shorten will be :shorten, else
+      "shorten".
+    • :length (integer, 10 by default) - the length for
+      the shorten.
+    • :generator (function) - the shorten is generated by the
+      generator function.
+      LinkShortener.Generators.SafeString.generate/1 by default.
   """
-  def generate_one(attrs, length \\ 10, generator \\ &SafeString.generate/1) do
+  @spec generate_one(map(), is_atom_based: boolean(), length: integer(), generator: function()) ::
+          [map()]
+  def generate_one(attrs, opts \\ []) do
+    is_atom_based = Keyword.get(opts, :is_atom_based, true)
+    length = Keyword.get(opts, :length, 10)
+    generator = Keyword.get(opts, :generator, &SafeString.generate/1)
+
+    if is_atom_based do
       Map.put(attrs, :shorten, generator.(length))
+    else
+      Map.put(attrs, "shorten", generator.(length))
+    end
   end
 end

test/link_shortener/generators/link_with_random_shorten_test.exs

@@ -23,7 +23,11 @@ defmodule LinkShortener.Generators.LinkWithRandomShortenTest do
     assert %{
              name: @name,
              shorten: shorten
-    } = LinkWithRandomShorten.generate_one(@attrs, expected_length)
+           } =
+             LinkWithRandomShorten.generate_one(@attrs,
+               is_atom_based: true,
+               length: expected_length
+             )
 
     assert String.length(shorten) == expected_length
   end
@@ -36,7 +40,13 @@ defmodule LinkShortener.Generators.LinkWithRandomShortenTest do
     assert %{
              name: @name,
              shorten: shorten
-    } = LinkWithRandomShorten.generate_one(@attrs, expected_length, random_generator)
+           } =
+             LinkWithRandomShorten.generate_one(
+               @attrs,
+               is_atom_based: true,
+               length: expected_length,
+               generator: random_generator
+             )
 
     assert String.length(shorten) == expected_length
     assert shorten == expected_shorten