refactor: move lib/postal/smtp_server to app/lib/smtp_server

spec/lib/smtp_server/client/mail_from_spec.rb

@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+
+module SMTPServer
+
+  describe Client do
+    let(:ip_address) { "1.2.3.4" }
+    subject(:client) { described_class.new(ip_address) }
+
+    describe "MAIL FROM" do
+      it "returns an error if no HELO is provided" do
+        expect(client.handle("MAIL FROM: test@example.com")).to eq "503 EHLO/HELO first please"
+        expect(client.state).to eq :welcome
+      end
+
+      it "resets the transaction when called" do
+        expect(client).to receive(:transaction_reset).and_call_original.at_least(3).times
+        client.handle("HELO test.example.com")
+        client.handle("MAIL FROM: test@example.com")
+        client.handle("MAIL FROM: test2@example.com")
+      end
+
+      it "sets the mail from address" do
+        client.handle("HELO test.example.com")
+        expect(client.handle("MAIL FROM: test@example.com")).to eq "250 OK"
+        expect(client.state).to eq :mail_from_received
+        expect(client.instance_variable_get("@mail_from")).to eq "test@example.com"
+      end
+    end
+  end
+
+end