fix: undefined method contact in support mailbox (#2678)

if chatwoot receives an email of already existing contact with a different case say "Care@example.com", before this fix, it will throw an error. Now it will retrieve existing contact

Fixes: #2553


Co-authored-by: Sojan Jose <sojan@pepalo.com>

spec/builders/contact_builder_spec.rb

@@ -66,6 +66,20 @@ describe ::ContactBuilder do
       expect(contact_inbox.contact.id).to be(contact.id)
     end
 
+    it 'doesnot create contact when an uppercase email is passed for an already existing contact email' do
+      contact_inbox = described_class.new(
+        source_id: '123456',
+        inbox: inbox,
+        contact_attributes: {
+          name: 'Contact',
+          phone_number: '+1234567890',
+          email: contact.email.upcase
+        }
+      ).perform
+
+      expect(contact_inbox.contact.id).to be(contact.id)
+    end
+
     it 'doesnot create contact if it already exist with phone number' do
       contact_inbox = described_class.new(
         source_id: '123456',

spec/fixtures/files/welcome.eml

@@ -1,4 +1,4 @@
-From: Sony Mathew <sony@chatwoot.com>
+From: Sony Mathew <Sony@chatwoot.com>
 Mime-Version: 1.0 (Apple Message framework v1244.3)
 Content-Type: multipart/alternative; boundary="Apple-Mail=_33A037C7-4BB3-4772-AE52-FCF2D7535F74"
 Subject: Discussion: Let's debate these attachments
@@ -628,4 +628,4 @@ r/Fxp3Y0d2/4tvsR95f/AAH7Gvwmn9rUHsOgUCg//9k=
 
 --Apple-Mail=_83444AF4-343C-4F75-AF8F-14E1E7434FC1--
 
---Apple-Mail=_33A037C7-4BB3-4772-AE52-FCF2D7535F74--
+--Apple-Mail=_33A037C7-4BB3-4772-AE52-FCF2D7535F74--

spec/presenters/mail_presenter_spec.rb

@@ -52,5 +52,9 @@ RSpec.describe MailPresenter do
       expect(data[:multipart]).to eq(true)
       expect(data[:subject]).to eq(decorated_mail.subject)
     end
+
+    it 'give email from in downcased format' do
+      expect(decorated_mail.from.first.eql?(mail.from.first.downcase)).to eq true
+    end
   end
 end