From e8e8c27c134cc695ee9ce54f26b6bb3338d707ae Mon Sep 17 00:00:00 2001
From: Moacir Petry <m.petry9@gmail.com>
Date: Mon, 27 Jul 2026 17:57:07 -0300
Subject: [PATCH] Add Faker::Company.brazilian_company_alphanumeric

---
 lib/faker/default/company.rb             | 26 ++++++++++++++++++++
 test/faker/default/test_faker_company.rb | 30 ++++++++++++++++++++++++
 2 files changed, 56 insertions(+)

diff --git a/lib/faker/default/company.rb b/lib/faker/default/company.rb
index e694f9802f..204b747c8a 100644
--- a/lib/faker/default/company.rb
+++ b/lib/faker/default/company.rb
@@ -435,6 +435,32 @@ def brazilian_company_number(formatted: false)
         formatted ? format('%s.%s.%s/%s-%s', *number.scan(/(\d{2})(\d{3})(\d{3})(\d{4})(\d{2})/).flatten) : number
       end
 
+      ##
+      # Produces a company brazilian company alphanumeric.
+      #
+      # @return [String]
+      #
+      # @example
+      #   Faker::Company.brazilian_company_alphanumeric #=> "AB12CD34EFGH83"
+      #
+      # @faker.version next
+      def brazilian_company_alphanumeric(formatted: false)
+        base = Faker::Alphanumeric.alphanumeric(number: 12).upcase.chars
+
+        factors = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2, 6].cycle
+
+        2.times do
+          checksum = base.inject(0) do |acc, char|
+            acc + (char.ord - 48) * factors.next
+          end % 11
+          base << (checksum < 2 ? '0' : (11 - checksum).to_s)
+        end
+
+        alphanumeric = base.join
+
+        formatted ? format('%s.%s.%s/%s-%s', *alphanumeric.scan(/(.{2})(.{3})(.{3})(.{4})(.{2})/).flatten) : alphanumeric
+      end
+
       ##
       # Get a random Russian tax number.
       # @param region [String] Any region string
diff --git a/test/faker/default/test_faker_company.rb b/test/faker/default/test_faker_company.rb
index a6e1a6846e..b9e6f7cd27 100644
--- a/test/faker/default/test_faker_company.rb
+++ b/test/faker/default/test_faker_company.rb
@@ -201,6 +201,36 @@ def test_brazilian_company_number_formatted
     assert_match(/^\d{2}\.\d{3}\.\d{3}\/\d{4}-\d{2}$/, sample)
   end
 
+  def test_brazilian_company_alphanumeric
+    sample = @tester.brazilian_company_alphanumeric
+
+    assert_match(/\A[A-Z0-9]{14}\z/, sample)
+    assert_match(/\A.{12}\d{2}\z/, sample)
+
+    values = sample[0..11].chars.map { |c| c.ord - 48 }
+
+    weights1 = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
+    sum1 = values.each_with_index.inject(0) { |acc, (v, i)| acc + v * weights1[i] }
+    remainder = sum1 % 11
+    first_digit = remainder < 2 ? '0' : (11 - remainder).to_s
+
+    assert_equal sample[12], first_digit
+
+    values << first_digit.to_i
+    weights2 = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2]
+    sum2 = values.each_with_index.inject(0) { |acc, (v, i)| acc + v * weights2[i] }
+    remainder2 = sum2 % 11
+    second_digit = remainder2 < 2 ? '0' : (11 - remainder2).to_s
+
+    assert_equal sample[13], second_digit
+  end
+
+  def test_brazilian_company_alphanumeric_formatted
+    sample = @tester.brazilian_company_alphanumeric(formatted: true)
+
+    assert_match(/\A[A-Z0-9]{2}\.[A-Z0-9]{3}\.[A-Z0-9]{3}\/[A-Z0-9]{4}-\d{2}\z/, sample)
+  end
+
   def test_russian_tax_number_default
     assert_match(/\d{10}/, @tester.russian_tax_number)
   end