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); } }