Constructive description here

vendor/fzaninotto/faker/test/Faker/Provider/it_IT/CompanyTest.php

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+<?php
+
+namespace Faker\Test\Provider\it_IT;
+
+use Faker\Generator;
+use Faker\Provider\it_IT\Company;
+
+class CompanyTest extends \PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Company($faker));
+        $this->faker = $faker;
+    }
+
+    public function testIfTaxIdCanReturnData()
+    {
+        $vatId = $this->faker->vatId();
+        $this->assertRegExp('/^IT[0-9]{11}$/', $vatId);
+    }
+    
+}

vendor/fzaninotto/faker/test/Faker/Provider/it_IT/PersonTest.php

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+<?php
+
+namespace Faker\Test\Provider\it_IT;
+
+use Faker\Generator;
+use Faker\Provider\it_IT\Person;
+
+class PersonTest extends \PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        $faker = new Generator();
+        $faker->addProvider(new Person($faker));
+        $this->faker = $faker;
+    }
+
+    public function testIfTaxIdCanReturnData()
+    {
+        $taxId = $this->faker->taxId();
+        $this->assertRegExp('/^[a-zA-Z]{6}[0-9]{2}[a-zA-Z][0-9]{2}[a-zA-Z][0-9]{3}[a-zA-Z]$/', $taxId);
+    }
+    
+}