Break out specs

Author: bradgessler

Gemfile.lock

@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     supermail (0.1.0)
-      actionmailer (~> 7.0)
+      actionmailer (>= 7.0)
 
 GEM
   remote: https://rubygems.org/

lib/supermail.rb

@@ -1,21 +1,25 @@
 # frozen_string_literal: true
 
 require_relative "supermail/version"
-require "action_mailer"
+require 'action_mailer'
 
 module Supermail
   class Error < StandardError; end
 
   module Rails
     class Base
-      delegate :deliver, :deliver_now, :deliver_later, to: :message
+      delegate :deliver, :deliver_now, :deliver_later, to: :message_delivery
 
       def to = nil
       def from = nil
       def subject = nil
       def body = ""
 
       def message
+        message_delivery.message
+      end
+
+      def message_delivery
         ActionMailer::Base.mail(to:, from:, subject:, body:)
       end
     end

spec/supermail_spec.rb

@@ -0,0 +1,45 @@
+# frozen_string_literal: true
+
+require "spec_helper"
+
+class ExampleMailer < Supermail::Rails::Base
+  def initialize(to:, from:, subject:, body:)
+    @to = to
+    @from = from
+    @subject = subject
+    @body = body
+  end
+
+  attr_reader :to, :from, :subject, :body
+end
+
+RSpec.describe ExampleMailer do
+  let(:email) { described_class.new(
+    to: "[email protected]",
+    from: "[email protected]",
+    subject: "Hello",
+    body: "Hi there")
+  }
+  let(:message) { email.message }
+  subject { message }
+
+  it "builds a Mail::Message" do
+    expect(subject).to be_a(Mail::Message)
+  end
+
+  it "sets the to header" do
+    expect(subject.to).to eq(["[email protected]"])
+  end
+
+  it "sets the from header" do
+    expect(subject.from).to eq(["[email protected]"])
+  end
+
+  it "sets the subject header" do
+    expect(subject.subject).to eq("Hello")
+  end
+
+  it "sets the body" do
+    expect(subject.body.to_s).to eq("Hi there")
+  end
+end