From f0758dc7e25dbaacad73679016bb6915e5415665 Mon Sep 17 00:00:00 2001
From: Bjoern Ebbrecht <bjoern.ebbrecht@gmail.com>
Date: Wed, 22 Jan 2020 10:43:14 +0100
Subject: [PATCH] added tax support for de_DE

---
 src/Faker/Provider/de_DE/Payment.php      | 20 ++++++++++++++
 src/Faker/Provider/de_DE/Person.php       | 32 +++++++++++++++++++++++
 test/Faker/Provider/de_DE/PaymentTest.php | 31 ++++++++++++++++++++++
 test/Faker/Provider/de_DE/PersonTest.php  | 29 ++++++++++++++++++++
 4 files changed, 112 insertions(+)
 create mode 100644 test/Faker/Provider/de_DE/PaymentTest.php
 create mode 100644 test/Faker/Provider/de_DE/PersonTest.php

diff --git a/src/Faker/Provider/de_DE/Payment.php b/src/Faker/Provider/de_DE/Payment.php
index f60e62ffbb..7f6a9874ed 100644
--- a/src/Faker/Provider/de_DE/Payment.php
+++ b/src/Faker/Provider/de_DE/Payment.php
@@ -53,4 +53,24 @@ public static function bank()
     {
         return static::randomElement(static::$banks);
     }
+
+    /**
+     * Value Added Tax (VAT)
+     *
+     * @example 'DE123456789', ('spaced') 'DE 123456789'
+     *
+     * @see http://ec.europa.eu/taxation_customs/vies/faq.html?locale=en#item_11
+     * @see http://www.iecomputersystems.com/ordering/eu_vat_numbers.htm
+     * @see http://en.wikipedia.org/wiki/VAT_identification_number
+     *
+     * @param bool $spacedNationalPrefix
+     *
+     * @return string VAT Number
+     */
+    public static function vat($spacedNationalPrefix = false)
+    {
+        $prefix = $spacedNationalPrefix ? "DE " : "DE";
+
+        return sprintf("%s%d", $prefix, self::randomNumber(9, true));
+    }
 }
diff --git a/src/Faker/Provider/de_DE/Person.php b/src/Faker/Provider/de_DE/Person.php
index 5189a2a2fe..33ad17770f 100644
--- a/src/Faker/Provider/de_DE/Person.php
+++ b/src/Faker/Provider/de_DE/Person.php
@@ -126,4 +126,36 @@ public static function suffix()
     {
         return static::randomElement(static::$suffix);
     }
+
+    /**
+     * Tax Identification Number (TIN)
+     *
+     * @example '76334701345'
+     *
+     * @see https://ec.europa.eu/taxation_customs/tin/pdf/de/TIN_-_country_sheet_DE_de.pdf
+     *
+     * @return string TIN Number
+     */
+    public function tin()
+    {
+        $tin = $this->randomDigitNot(0).$this->randomNumber(9);
+
+        $product = 0;
+        for($i = 0; $i < strlen($tin); $i++) {
+            $sum = ($tin[$i] + $product) % 10;
+
+            if ($sum == 0) {
+                $sum = 10;
+            }
+
+            $product = ($sum * 2) % 11;
+        }
+
+        $checkDigit = 11 - $product;
+        if ($checkDigit == 10) {
+            $checkDigit = 0;
+        }
+
+        return $tin . $checkDigit;
+    }
 }
diff --git a/test/Faker/Provider/de_DE/PaymentTest.php b/test/Faker/Provider/de_DE/PaymentTest.php
new file mode 100644
index 0000000000..6c8cae3cf3
--- /dev/null
+++ b/test/Faker/Provider/de_DE/PaymentTest.php
@@ -0,0 +1,31 @@
+<?php
+
+namespace Faker\Test\Provider\de_DE;
+
+use Faker\Generator;
+use Faker\Provider\de_DE\Payment;
+use PHPUnit\Framework\TestCase;
+
+final class PaymentTest extends TestCase
+{
+
+    /**
+     * @var Generator
+     */
+    private $faker;
+
+    protected function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Payment($faker));
+        $this->faker = $faker;
+    }
+
+    public function testVatIsValid()
+    {
+        $unspacedVat = $this->faker->vat();
+        $vat = $this->faker->vat(true);
+        $this->assertRegExp('/^(DE \d{9})$/', $vat);
+        $this->assertRegExp('/^(DE\d{9})$/', $unspacedVat);
+    }
+}
diff --git a/test/Faker/Provider/de_DE/PersonTest.php b/test/Faker/Provider/de_DE/PersonTest.php
new file mode 100644
index 0000000000..61be920c32
--- /dev/null
+++ b/test/Faker/Provider/de_DE/PersonTest.php
@@ -0,0 +1,29 @@
+<?php
+
+namespace Faker\Test\Provider\de_DE;
+
+use Faker\Generator;
+use Faker\Provider\de_DE\Person;
+use PHPUnit\Framework\TestCase;
+
+final class PersonTest extends TestCase
+{
+
+    /**
+     * @var Generator
+     */
+    private $faker;
+
+    protected function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Person($faker));
+        $this->faker = $faker;
+    }
+
+    public function testTinIsValid()
+    {
+        $tin = $this->faker->tin();
+        $this->assertRegExp('/^(\d{11})$/', $tin);
+    }
+}