feat: allow text message

lib/swoosh_mailinator.ex

@@ -36,18 +36,41 @@ defmodule Swoosh.Adapters.Mailinator do
   Don't use this adapter for confidential information.
 
   Use for tests only.
-
-  TODO: allow to choose from Text or HTML :prefer_html, :prefer_text
-  """
+"""
 
   use Swoosh.Adapter, required_config: []
 
   alias Swoosh.Email
   alias Swoosh.Mailer
 
-  def deliver(%Email{} = email, _) do
+  def deliver(%Email{html_body: html, text_body: text} = email, _) when is_nil(html) do
+    email |> delegate
+  end
+
+  def deliver(%Email{html_body: html, text_body: text} = email, _) when is_nil(text) do
+    email |> delegate
+  end
+
+  def deliver(%Email{html_body: _, text_body: _} = email, _) do
     email
     |> Map.put(:text_body, nil)
+    |> delegate
+  end
+
+  def deliver(%Email{text_body: _} = email, _) do
+    email
+    |> Map.put(:html_body, nil)
+    |> delegate
+  end
+
+  def deliver(%Email{html_body: _} = email, _) do
+    email
+    |> Map.put(:text_body, nil)
+    |> delegate
+  end
+
+  defp delegate(%Email{} = email) do
+    email
     |> Mailer.deliver([
       adapter: Swoosh.Adapters.SMTP,
       relay: "mail.mailinator.com",