Finish email allow/deny list naming migration (#30530)

spec/validators/user_email_validator_spec.rb

@@ -0,0 +1,51 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe UserEmailValidator do
+  describe '#validate' do
+    subject { described_class.new.validate(user) }
+
+    let(:user)   { instance_double(User, email: 'info@mail.com', sign_up_ip: '1.2.3.4', errors: errors) }
+    let(:errors) { instance_double(ActiveModel::Errors, add: nil) }
+
+    before do
+      allow(user).to receive(:valid_invitation?).and_return(false)
+      allow(EmailDomainBlock).to receive(:block?) { blocked_email }
+    end
+
+    context 'when e-mail provider is blocked' do
+      let(:blocked_email) { true }
+
+      it 'adds error' do
+        subject
+
+        expect(errors).to have_received(:add).with(:email, :blocked).once
+      end
+    end
+
+    context 'when e-mail provider is not blocked' do
+      let(:blocked_email) { false }
+
+      it 'does not add errors' do
+        subject
+
+        expect(errors).to_not have_received(:add)
+      end
+
+      context 'when canonical e-mail is blocked' do
+        let(:other_user) { Fabricate(:user, email: 'i.n.f.o@mail.com') }
+
+        before do
+          other_user.account.suspend!
+        end
+
+        it 'adds error' do
+          subject
+
+          expect(errors).to have_received(:add).with(:email, :taken).once
+        end
+      end
+    end
+  end
+end