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

test/link_shortener/generators/link_with_random_shorten_test.exs

@@ -1,18 +1,18 @@
 defmodule LinkShortener.Generators.LinkWithRandomShortenTest do
   use ExUnit.Case, async: true
-  
+
   alias LinkShortener.Generators.LinkWithRandomShorten
 
   @name "Some name"
   @attrs %{
     name: @name
   }
-  
+
   test "generate/1 returns random safe string with 10 as length" do
     assert %{
-      name: @name,
-      shorten: shorten
-    } = LinkWithRandomShorten.generate_one(@attrs)
+             name: @name,
+             shorten: shorten
+           } = LinkWithRandomShorten.generate_one(@attrs)
 
     assert String.length(shorten) == 10
   end
@@ -21,22 +21,32 @@ defmodule LinkShortener.Generators.LinkWithRandomShortenTest do
     expected_length = 5
 
     assert %{
-      name: @name,
-      shorten: shorten
-    } = LinkWithRandomShorten.generate_one(@attrs, expected_length)
+             name: @name,
+             shorten: shorten
+           } =
+             LinkWithRandomShorten.generate_one(@attrs,
+               is_atom_based: true,
+               length: expected_length
+             )
 
     assert String.length(shorten) == expected_length
   end
 
   test "generate/3 returns random safe string using a lambda function" do
     random_generator = fn _ -> "random_shorten" end
-    expected_shorten = random_generator.(14) 
+    expected_shorten = random_generator.(14)
     expected_length = expected_shorten |> String.length()
 
     assert %{
-      name: @name,
-      shorten: shorten
-    } = LinkWithRandomShorten.generate_one(@attrs, expected_length, random_generator)
+             name: @name,
+             shorten: shorten
+           } =
+             LinkWithRandomShorten.generate_one(
+               @attrs,
+               is_atom_based: true,
+               length: expected_length,
+               generator: random_generator
+             )
 
     assert String.length(shorten) == expected_length
     assert shorten == expected_shorten