diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index 1ee39d6..a38b416 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -24,20 +24,29 @@ tools:
 
 build:
     dependencies:
-        before:
-            - "sudo composer self-update"
         override:
             - "composer install --no-interaction --prefer-dist"
-    tests:
-        override:
-            -
-                command: './vendor/bin/phpunit -c phpunit.xml.dist --coverage-clover=clover.xml'
-                coverage:
-                    file: 'clover.xml'
-                    format: 'php-clover'
+    nodes:
+        analysis:
+            tests:
+                override:
+                    - php-scrutinizer-run
+
+        coverage:
+            environment:
+                php:
+                    ini:
+                        "xdebug.mode": coverage
+            tests:
+                override:
+                    -
+                        command: './vendor/bin/phpunit -c phpunit.xml.dist --coverage-clover=clover.xml'
+                        coverage:
+                            file: 'clover.xml'
+                            format: 'php-clover'
     environment:
         php:
-            version: 7.0.8
+            version: 8
         mysql: false
         postgresql: false
         redis: false
@@ -45,4 +54,4 @@ build:
         rabbitmq: false
         mongodb: false
         neo4j: false
-        memcached: false
\ No newline at end of file
+        memcached: false
diff --git a/README.md b/README.md
index a8bc996..38e2af1 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,11 @@
 Brazanation Documents
 =====================
 
-[![Build Status](https://travis-ci.org/brazanation/php-documents.svg?branch=master)](https://travis-ci.org/brazanation/php-documents)
-[![Codacy Badge](https://api.codacy.com/project/badge/Grade/0bdf934bc4224a9fb9d51dc9162fb000)](https://www.codacy.com/app/tonicospinelli/php-documents?utm_source=github.com&utm_medium=referral&utm_content=brazanation/php-documents&utm_campaign=Badge_Grade)
-[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/brazanation/php-documents/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/brazanation/php-documents/?branch=master)
-[![Code Coverage](https://scrutinizer-ci.com/g/brazanation/php-documents/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/brazanation/php-documents/?branch=master)
-[![StyleCI](https://styleci.io/repos/66179431/shield)](https://styleci.io/repos/66179431)
+[![Build Status](https://scrutinizer-ci.com/g/brazanation/php-documents/badges/build.png?b=main)](https://scrutinizer-ci.com/g/brazanation/php-documents/build-status/main)
+[![Codacy Badge](https://app.codacy.com/project/badge/Grade/f8c31359fca64c0c9c8375182fbceefd)](https://www.codacy.com/gh/brazanation/php-documents/dashboard?utm_source=github.com&utm_medium=referral&utm_content=brazanation/php-documents&utm_campaign=Badge_Grade)
+[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/brazanation/php-documents/badges/quality-score.png?b=main)](https://scrutinizer-ci.com/g/brazanation/php-documents/?branch=main)
+[![Code Coverage](https://scrutinizer-ci.com/g/brazanation/php-documents/badges/coverage.png?b=main)](https://scrutinizer-ci.com/g/brazanation/php-documents/?branch=main)
+[![StyleCI](https://github.styleci.io/repos/66179431/shield?branch=main)](https://github.styleci.io/repos/66179431?branch=main)
 
 A PHP library to provide Brazilian Documents safer, easier and fun!
 
diff --git a/composer.json b/composer.json
index 42dd02c..a0bd2d0 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
         "php": ">=7.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.4",
+        "phpunit/phpunit": "^9.5",
         "codacy/coverage": "^1.0"
     },
     "license": "MIT",
diff --git a/src/DigitCalculator.php b/src/DigitCalculator.php
index f0d09b9..639c2a3 100644
--- a/src/DigitCalculator.php
+++ b/src/DigitCalculator.php
@@ -273,7 +273,7 @@ private function calculateAdditionalDigit(string $digit) : int
     private function calculateSingleSum(int $total) : int
     {
         if ($this->singleSum) {
-            return intval(($total / 10) + ($total % 10));
+            return (int) (($total / 10) + ($total % 10));
         }
 
         return $total;
diff --git a/src/JudiciaryProcess.php b/src/JudiciaryProcess.php
index d25aed7..ca0bea6 100644
--- a/src/JudiciaryProcess.php
+++ b/src/JudiciaryProcess.php
@@ -118,11 +118,11 @@ protected function extractBaseNumber(string $number) : string
      */
     public function calculateDigit(string $input) : string
     {
-        $remainderNumber = intval($this->sequentialNumber) % 97;
+        $remainderNumber = (int) $this->sequentialNumber % 97;
 
         $judiciaryNumber = "{$remainderNumber}{$this->year}{$this->judiciary}{$this->court}";
 
-        $remainderJudiciary = intval($judiciaryNumber) % 97;
+        $remainderJudiciary = (int) $judiciaryNumber % 97;
         $originNumber = "{$remainderJudiciary}{$this->origin}00";
 
         $remainder = (float) $originNumber % 97;
diff --git a/src/StateRegistration/Amapa.php b/src/StateRegistration/Amapa.php
index a317909..a2f2f16 100644
--- a/src/StateRegistration/Amapa.php
+++ b/src/StateRegistration/Amapa.php
@@ -30,7 +30,7 @@ public function __construct()
      */
     public function calculateDigit(string $baseNumber) : string
     {
-        $number = intval($baseNumber);
+        $number = (int) $baseNumber;
         $lastDigit = $this->discoverLastDigit($number);
         $digitToReplace = $this->discoverDigitToReplace($number);
 
diff --git a/src/StateRegistration/Goias.php b/src/StateRegistration/Goias.php
index 56bdd1c..5f9d602 100644
--- a/src/StateRegistration/Goias.php
+++ b/src/StateRegistration/Goias.php
@@ -48,7 +48,7 @@ private function setCurrentDigit(string $digit)
      */
     public function calculateDigit(string $baseNumber) : string
     {
-        $digitToReplace = $this->discoverDigitToReplace(intval($baseNumber));
+        $digitToReplace = $this->discoverDigitToReplace((int) $baseNumber);
 
         $calculator = new DigitCalculator($baseNumber);
         $calculator->useComplementaryInsteadOfModule();
diff --git a/tests/CnhTest.php b/tests/CnhTest.php
index d0ab911..5f25598 100644
--- a/tests/CnhTest.php
+++ b/tests/CnhTest.php
@@ -36,15 +36,12 @@ public function provideEmptyData() : array
     {
         return [
             [Cnh::LABEL, ''],
-            [Cnh::LABEL, null],
-            [Cnh::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Cnh::LABEL, 1],
             [Cnh::LABEL, '11111111111'],
             [Cnh::LABEL, '06843273172'],
         ];
diff --git a/tests/CnpjTest.php b/tests/CnpjTest.php
index 2c97ec5..7e64dbc 100644
--- a/tests/CnpjTest.php
+++ b/tests/CnpjTest.php
@@ -37,15 +37,12 @@ public function provideEmptyData() : array
     {
         return [
             [Cnpj::LABEL, ''],
-            [Cnpj::LABEL, null],
-            [Cnpj::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Cnpj::LABEL, 1],
             [Cnpj::LABEL, '11111111111111'],
             [Cnpj::LABEL, '00111222100099'],
             [Cnpj::LABEL, '00.111.222/1000-99'],
diff --git a/tests/CnsTest.php b/tests/CnsTest.php
index 1f03790..4201feb 100644
--- a/tests/CnsTest.php
+++ b/tests/CnsTest.php
@@ -42,15 +42,12 @@ public function provideEmptyData() : array
     {
         return [
             [Cns::LABEL, ''],
-            [Cns::LABEL, null],
-            [Cns::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Cns::LABEL, 1],
             [Cns::LABEL, '123123232323'],
             [Cns::LABEL, '861238979874'],
         ];
diff --git a/tests/CpfTest.php b/tests/CpfTest.php
index 0844552..3a4df1e 100644
--- a/tests/CpfTest.php
+++ b/tests/CpfTest.php
@@ -37,15 +37,12 @@ public function provideEmptyData() : array
     {
         return [
             [Cpf::LABEL, ''],
-            [Cpf::LABEL, null],
-            [Cpf::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Cpf::LABEL, 1],
             [Cpf::LABEL, '11111111111'],
             [Cpf::LABEL, '06843273172'],
             [Cpf::LABEL, '068.432.731-72'],
diff --git a/tests/JudiciaryProcessTest.php b/tests/JudiciaryProcessTest.php
index ab45c6c..1962041 100644
--- a/tests/JudiciaryProcessTest.php
+++ b/tests/JudiciaryProcessTest.php
@@ -37,15 +37,12 @@ public function provideEmptyData() : array
     {
         return [
             [JudiciaryProcess::LABEL, ''],
-            [JudiciaryProcess::LABEL, null],
-            [JudiciaryProcess::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [JudiciaryProcess::LABEL, 1],
             [JudiciaryProcess::LABEL, '11111111111111'],
             [JudiciaryProcess::LABEL, '00111222100099'],
             [JudiciaryProcess::LABEL, '00.111.222/1000-99'],
diff --git a/tests/PisPasepTest.php b/tests/PisPasepTest.php
index b94d59e..dda8e2f 100644
--- a/tests/PisPasepTest.php
+++ b/tests/PisPasepTest.php
@@ -37,15 +37,12 @@ public function provideEmptyData() : array
     {
         return [
             [PisPasep::LABEL, ''],
-            [PisPasep::LABEL, null],
-            [PisPasep::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [PisPasep::LABEL, 1],
             [PisPasep::LABEL, '11111111111'],
             [PisPasep::LABEL, '51823129492'],
             [PisPasep::LABEL, '51.82312.94-92'],
diff --git a/tests/RenavamTest.php b/tests/RenavamTest.php
index 104f07f..e00a19f 100644
--- a/tests/RenavamTest.php
+++ b/tests/RenavamTest.php
@@ -37,7 +37,6 @@ public function provideEmptyData() : array
     {
         return [
             [Renavam::LABEL, ''],
-            [Renavam::LABEL, null],
         ];
     }
 
diff --git a/tests/Sped/CTeTest.php b/tests/Sped/CTeTest.php
index 7a7f0ed..daa82f5 100644
--- a/tests/Sped/CTeTest.php
+++ b/tests/Sped/CTeTest.php
@@ -83,7 +83,7 @@ public function testGenerateAValidNumber()
         $this->assertEquals('33009911002506', "{$nfeKey->cnpj}", 'Failed assert for CNPJ');
         $this->assertEquals('57', "{$nfeKey->model}", 'Failed assert for model');
         $this->assertEquals('012', $nfeKey->sequence, 'Failed assert for sequence');
-        $this->assertEquals('00000780', $nfeKey->invoiceNumber, 'Failed assert for invoice number');
+        $this->assertEquals('000000780', $nfeKey->invoiceNumber, 'Failed assert for invoice number');
         $this->assertEquals(EmissionType::NORMAL, "{$nfeKey->emissionType}", 'Failed assert for emission type');
         $this->assertEquals('26730161', $nfeKey->controlNumber, 'Failed assert for digit');
         $this->assertEquals('52060433009911002506570120000007801267301610', "{$nfeKey}");
diff --git a/tests/Sped/MDFeTest.php b/tests/Sped/MDFeTest.php
index a77cc81..bc5babf 100644
--- a/tests/Sped/MDFeTest.php
+++ b/tests/Sped/MDFeTest.php
@@ -82,8 +82,8 @@ public function testGenerateAValidNumber()
         $this->assertEquals($generatedAt, $nfeKey->generatedAt, 'Failed assert for generatedAt');
         $this->assertEquals('33009911002506', "{$nfeKey->cnpj}", 'Failed assert for CNPJ');
         $this->assertEquals(Model::TYPE_MDFE, "{$nfeKey->model}", 'Failed assert for model');
-        $this->assertEquals('000000012', $nfeKey->sequence, 'Failed assert for sequence');
-        $this->assertEquals('00000780', $nfeKey->invoiceNumber, 'Failed assert for invoice number');
+        $this->assertEquals('012', $nfeKey->sequence, 'Failed assert for sequence');
+        $this->assertEquals('000000780', $nfeKey->invoiceNumber, 'Failed assert for invoice number');
         $this->assertEquals(EmissionType::NORMAL, "{$nfeKey->emissionType}", 'Failed assert for emission type');
         $this->assertEquals('26730161', $nfeKey->controlNumber, 'Failed assert for digit');
         $this->assertEquals('52060433009911002506580120000007801267301614', "{$nfeKey}");
diff --git a/tests/Sped/NFCeTest.php b/tests/Sped/NFCeTest.php
index 32944dc..a28a1ee 100644
--- a/tests/Sped/NFCeTest.php
+++ b/tests/Sped/NFCeTest.php
@@ -86,7 +86,7 @@ public function testGenerateAValidNumber()
         $this->assertEquals('012', $nfeKey->sequence, 'Failed assert for sequence');
         $this->assertEquals('000000780', $nfeKey->invoiceNumber, 'Failed assert for invoice number');
         $this->assertEquals(EmissionType::CONTINGENCY_ON_SAFETY_FORM, "{$nfeKey->emissionType}", 'Failed assert for emission type');
-        $this->assertEquals('006730161', $nfeKey->controlNumber, 'Failed assert for digit');
+        $this->assertEquals('06730161', $nfeKey->controlNumber, 'Failed assert for digit');
         $this->assertEquals('52060433009911002506650120000007802067301610', "{$nfeKey}");
     }
 }
diff --git a/tests/StateRegistration/AcreTest.php b/tests/StateRegistration/AcreTest.php
index 1a224ad..2a4b4bb 100644
--- a/tests/StateRegistration/AcreTest.php
+++ b/tests/StateRegistration/AcreTest.php
@@ -37,15 +37,12 @@ public function provideEmptyData() : array
     {
         return [
             [Acre::LONG_NAME, ''],
-            [Acre::LONG_NAME, null],
-            [Acre::LONG_NAME, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Acre::LONG_NAME, 1],
             [Acre::LONG_NAME, '0100482300113'],
         ];
     }
diff --git a/tests/StateRegistration/AlagoasTest.php b/tests/StateRegistration/AlagoasTest.php
index 607379f..61c3bb6 100644
--- a/tests/StateRegistration/AlagoasTest.php
+++ b/tests/StateRegistration/AlagoasTest.php
@@ -44,14 +44,14 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Alagoas::LONG_NAME, 0],
+            [Alagoas::LONG_NAME, ''],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Alagoas::LONG_NAME, 1],
+            [Alagoas::LONG_NAME, '1'],
             [Alagoas::LONG_NAME, '0100482300113'],
         ];
     }
diff --git a/tests/StateRegistration/AmapaTest.php b/tests/StateRegistration/AmapaTest.php
index 9571d96..7b7c5de 100644
--- a/tests/StateRegistration/AmapaTest.php
+++ b/tests/StateRegistration/AmapaTest.php
@@ -37,14 +37,14 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Amapa::LONG_NAME, 0],
+            [Amapa::LONG_NAME, ''],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Amapa::LONG_NAME, 1],
+            [Amapa::LONG_NAME, '1'],
             [Amapa::LONG_NAME, '03.012.345-8'],
         ];
     }
diff --git a/tests/StateRegistration/AmazonasTest.php b/tests/StateRegistration/AmazonasTest.php
index b82080e..9de0190 100644
--- a/tests/StateRegistration/AmazonasTest.php
+++ b/tests/StateRegistration/AmazonasTest.php
@@ -40,14 +40,14 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Amazonas::LONG_NAME, 0],
+            [Amazonas::LONG_NAME, ''],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Amazonas::LONG_NAME, 1],
+            [Amazonas::LONG_NAME, '1'],
             [Amazonas::LONG_NAME, '03.012.345-8'],
         ];
     }
diff --git a/tests/StateRegistration/BahiaTest.php b/tests/StateRegistration/BahiaTest.php
index d8fa066..0cd95b0 100644
--- a/tests/StateRegistration/BahiaTest.php
+++ b/tests/StateRegistration/BahiaTest.php
@@ -22,17 +22,17 @@ public function createDocumentFromString(string $number)
     public function provideValidNumbers() : array
     {
         return [
-            ['123456-63'],
+            ['0123456-63'],
             ['1000003-06'],
             ['1057652-04'],
             ['0635718-30'],
-            ['770288-84'],
+            ['0770288-84'],
             ['077.028.884'],
             ['085456408'],
-            ['78215597'],
-            ['75467384'],
-            ['45564835'],
-            ['01314209'],
+            ['078215597'],
+            ['075467384'],
+            ['045564835'],
+            ['001314209'],
             ['111568918'],
             ['039681030']
         ];
@@ -49,7 +49,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Bahia::LONG_NAME, 0],
+            [Bahia::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/CearaTest.php b/tests/StateRegistration/CearaTest.php
index 79834db..b6f912d 100644
--- a/tests/StateRegistration/CearaTest.php
+++ b/tests/StateRegistration/CearaTest.php
@@ -40,7 +40,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Ceara::LONG_NAME, 0],
+            [Ceara::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/DistritoFederalTest.php b/tests/StateRegistration/DistritoFederalTest.php
index bb0da92..bc43f07 100644
--- a/tests/StateRegistration/DistritoFederalTest.php
+++ b/tests/StateRegistration/DistritoFederalTest.php
@@ -42,15 +42,13 @@ public function provideEmptyData() : array
     {
         return [
             [DF::LONG_NAME, ''],
-            [DF::LONG_NAME, null],
-            [DF::LONG_NAME, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [DF::LONG_NAME, 1],
+            [DF::LONG_NAME, '1'],
             [DF::LONG_NAME, '0756855600125'],
         ];
     }
diff --git a/tests/StateRegistration/EspiritoSantoTest.php b/tests/StateRegistration/EspiritoSantoTest.php
index 5acd71a..84fe315 100644
--- a/tests/StateRegistration/EspiritoSantoTest.php
+++ b/tests/StateRegistration/EspiritoSantoTest.php
@@ -42,7 +42,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [EspiritoSanto::LONG_NAME, 0],
+            [EspiritoSanto::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/GoiasTest.php b/tests/StateRegistration/GoiasTest.php
index 36e980b..f8c6433 100644
--- a/tests/StateRegistration/GoiasTest.php
+++ b/tests/StateRegistration/GoiasTest.php
@@ -38,7 +38,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Goias::LONG_NAME, 0],
+            [Goias::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/MaranhaoTest.php b/tests/StateRegistration/MaranhaoTest.php
index a5345cb..70ce9f3 100644
--- a/tests/StateRegistration/MaranhaoTest.php
+++ b/tests/StateRegistration/MaranhaoTest.php
@@ -37,7 +37,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [Maranhao::LONG_NAME, 0],
+            [Maranhao::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/MatoGrossoSulTest.php b/tests/StateRegistration/MatoGrossoSulTest.php
index 02ecf16..c2cb30d 100644
--- a/tests/StateRegistration/MatoGrossoSulTest.php
+++ b/tests/StateRegistration/MatoGrossoSulTest.php
@@ -49,7 +49,6 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [MatoGrossoSul::LONG_NAME, 0],
             [MatoGrossoSul::LONG_NAME, ''],
             [MatoGrossoSul::LONG_NAME, null],
         ];
@@ -58,7 +57,7 @@ public function provideEmptyData() : array
     public function provideInvalidNumber() : array
     {
         return [
-            [MatoGrossoSul::LONG_NAME, 1],
+            [MatoGrossoSul::LONG_NAME, '1'],
             [MatoGrossoSul::LONG_NAME, '9987477353930'],
         ];
     }
diff --git a/tests/StateRegistration/MatoGrossoTest.php b/tests/StateRegistration/MatoGrossoTest.php
index 87b8280..a7172bb 100644
--- a/tests/StateRegistration/MatoGrossoTest.php
+++ b/tests/StateRegistration/MatoGrossoTest.php
@@ -58,59 +58,59 @@ public function provideValidNumbers() : array
             ['0013284135-5'],
             ['0013286376-6'],
             ['0013286372-3'],
-            ['13335740-6'],
-            ['13329659-8'],
-            ['13325238-8'],
-            ['13321779-5'],
-            ['13316631-7'],
-            ['13315986-8'],
-            ['13314253-1'],
-            ['13311864-9'],
-            ['13307025-5'],
-            ['13306973-7'],
-            ['13304830-6'],
-            ['13303486-0'],
-            ['13294120-1'],
-            ['13290722-4'],
-            ['13283924-5'],
-            ['13281414-5'],
-            ['13277927-7'],
-            ['13265692-2'],
-            ['13263194-6'],
-            ['13262435-4'],
-            ['13260274-1'],
-            ['13249876-6'],
-            ['13247098-5'],
-            ['13241159-8'],
-            ['13227586-4'],
-            ['130365630-0'],
-            ['130234200-0'],
-            ['130181544-3'],
-            ['130181541-9'],
-            ['130181537-0'],
-            ['130181535-4'],
-            ['130181534-6'],
-            ['130181533-8'],
-            ['130181532-0'],
-            ['130181531-1'],
-            ['130181530-3'],
-            ['130181529-0'],
-            ['130181528-1'],
-            ['130181527-3'],
-            ['130181526-5'],
-            ['130181525-7'],
-            ['130181524-9'],
-            ['130181523-0'],
-            ['130181522-2'],
-            ['130181521-4'],
-            ['130181520-6'],
-            ['130181519-2'],
-            ['130181518-4'],
-            ['130181517-6'],
-            ['130181516-8'],
-            ['0064573571-0'],
-            ['064573571-0'],
-            ['64573571-0'],
+            ['0013335740-6'],
+            ['0013329659-8'],
+            ['0013325238-8'],
+            ['0013321779-5'],
+            ['0013316631-7'],
+            ['0013315986-8'],
+            ['0013314253-1'],
+            ['0013311864-9'],
+            ['0013307025-5'],
+            ['0013306973-7'],
+            ['0013304830-6'],
+            ['0013303486-0'],
+            ['0013294120-1'],
+            ['0013290722-4'],
+            ['0013283924-5'],
+            ['0013281414-5'],
+            ['0013277927-7'],
+            ['0013265692-2'],
+            ['0013263194-6'],
+            ['0013262435-4'],
+            ['0013260274-1'],
+            ['0013249876-6'],
+            ['0013247098-5'],
+            ['0013241159-8'],
+            ['0013227586-4'],
+            ['00130365630-0'],
+            ['00130234200-0'],
+            ['00130181544-3'],
+            ['00130181541-9'],
+            ['00130181537-0'],
+            ['00130181535-4'],
+            ['00130181534-6'],
+            ['00130181533-8'],
+            ['00130181532-0'],
+            ['00130181531-1'],
+            ['00130181530-3'],
+            ['00130181529-0'],
+            ['00130181528-1'],
+            ['00130181527-3'],
+            ['00130181526-5'],
+            ['00130181525-7'],
+            ['00130181524-9'],
+            ['00130181523-0'],
+            ['00130181522-2'],
+            ['00130181521-4'],
+            ['00130181520-6'],
+            ['00130181519-2'],
+            ['00130181518-4'],
+            ['00130181517-6'],
+            ['00130181516-8'],
+            ['00064573571-0'],
+            ['00064573571-0'],
+            ['00064573571-0'],
         ];
     }
 
@@ -127,7 +127,6 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [MatoGrosso::LONG_NAME, 0],
             [MatoGrosso::LONG_NAME, ''],
             [MatoGrosso::LONG_NAME, null],
         ];
diff --git a/tests/StateRegistration/MinasGeraisTest.php b/tests/StateRegistration/MinasGeraisTest.php
index e83e3ec..93a53a5 100644
--- a/tests/StateRegistration/MinasGeraisTest.php
+++ b/tests/StateRegistration/MinasGeraisTest.php
@@ -40,7 +40,6 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [MG::LONG_NAME, 0],
             [MG::LONG_NAME, ''],
             [MG::LONG_NAME, null],
         ];
@@ -49,7 +48,7 @@ public function provideEmptyData() : array
     public function provideInvalidNumber() : array
     {
         return [
-            [MG::LONG_NAME, 1],
+            [MG::LONG_NAME, '1'],
             [MG::LONG_NAME, '9987477353930'],
         ];
     }
diff --git a/tests/StateRegistration/ParaTest.php b/tests/StateRegistration/ParaTest.php
index 2f1cc63..d52b4cf 100644
--- a/tests/StateRegistration/ParaTest.php
+++ b/tests/StateRegistration/ParaTest.php
@@ -46,6 +46,7 @@ public function provideEmptyData() : array
     {
         return [
             [Para::LONG_NAME, null],
+            [Para::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/ParaibaTest.php b/tests/StateRegistration/ParaibaTest.php
index e27265a..5fba56d 100644
--- a/tests/StateRegistration/ParaibaTest.php
+++ b/tests/StateRegistration/ParaibaTest.php
@@ -137,6 +137,7 @@ public function provideEmptyData() : array
     {
         return [
             [Paraiba::LONG_NAME, null],
+            [Paraiba::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/PernambucoTest.php b/tests/StateRegistration/PernambucoTest.php
index 95b9441..150c95d 100644
--- a/tests/StateRegistration/PernambucoTest.php
+++ b/tests/StateRegistration/PernambucoTest.php
@@ -44,6 +44,7 @@ public function provideEmptyData() : array
     {
         return [
             [Pernambuco::LONG_NAME, null],
+            [Pernambuco::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/PiauiTest.php b/tests/StateRegistration/PiauiTest.php
index e315ec3..958545d 100644
--- a/tests/StateRegistration/PiauiTest.php
+++ b/tests/StateRegistration/PiauiTest.php
@@ -39,6 +39,7 @@ public function provideEmptyData() : array
     {
         return [
             [Piaui::LONG_NAME, null],
+            [Piaui::LONG_NAME, ''],
         ];
     }
 
diff --git a/tests/StateRegistration/RioDeJaneiroTest.php b/tests/StateRegistration/RioDeJaneiroTest.php
index c4afad1..b4dcd8d 100644
--- a/tests/StateRegistration/RioDeJaneiroTest.php
+++ b/tests/StateRegistration/RioDeJaneiroTest.php
@@ -37,9 +37,8 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
-            [RioDeJaneiro::LONG_NAME, null],
-            [RioDeJaneiro::LONG_NAME, false],
             [RioDeJaneiro::LONG_NAME, ''],
+            [RioDeJaneiro::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/RioGrandeDoNorteTest.php b/tests/StateRegistration/RioGrandeDoNorteTest.php
index 2eb492a..062c357 100644
--- a/tests/StateRegistration/RioGrandeDoNorteTest.php
+++ b/tests/StateRegistration/RioGrandeDoNorteTest.php
@@ -46,6 +46,7 @@ public function provideEmptyData() : array
     {
         return [
             [RioGrandeDoNorte::LONG_NAME, ''],
+            [RioGrandeDoNorte::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/RioGrandeDoSulTest.php b/tests/StateRegistration/RioGrandeDoSulTest.php
index d23e27c..01efe07 100644
--- a/tests/StateRegistration/RioGrandeDoSulTest.php
+++ b/tests/StateRegistration/RioGrandeDoSulTest.php
@@ -39,6 +39,7 @@ public function provideEmptyData() : array
     {
         return [
             [RioGrandeDoSul::LONG_NAME, ''],
+            [RioGrandeDoSul::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/RondoniaTest.php b/tests/StateRegistration/RondoniaTest.php
index 985ff99..8b0809b 100644
--- a/tests/StateRegistration/RondoniaTest.php
+++ b/tests/StateRegistration/RondoniaTest.php
@@ -64,6 +64,7 @@ public function provideEmptyData() : array
     {
         return [
             [Rondonia::LONG_NAME, ''],
+            [Rondonia::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/RoraimaTest.php b/tests/StateRegistration/RoraimaTest.php
index 33974cd..7b9dd8f 100644
--- a/tests/StateRegistration/RoraimaTest.php
+++ b/tests/StateRegistration/RoraimaTest.php
@@ -47,6 +47,7 @@ public function provideEmptyData() : array
     {
         return [
             [Roraima::LONG_NAME, ''],
+            [Roraima::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/SantaCatarinaTest.php b/tests/StateRegistration/SantaCatarinaTest.php
index c6be73f..b57e8fe 100644
--- a/tests/StateRegistration/SantaCatarinaTest.php
+++ b/tests/StateRegistration/SantaCatarinaTest.php
@@ -38,6 +38,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
+            [SantaCatarina::LONG_NAME, null],
             [SantaCatarina::LONG_NAME, ''],
         ];
     }
diff --git a/tests/StateRegistration/SaoPauloTest.php b/tests/StateRegistration/SaoPauloTest.php
index 0ca9d13..5fadfcd 100644
--- a/tests/StateRegistration/SaoPauloTest.php
+++ b/tests/StateRegistration/SaoPauloTest.php
@@ -39,6 +39,7 @@ public function provideEmptyData() : array
     {
         return [
             [SaoPaulo::LONG_NAME, ''],
+            [SaoPaulo::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/StateRegistration/SergipeTest.php b/tests/StateRegistration/SergipeTest.php
index 5cbd41d..b84f3bc 100644
--- a/tests/StateRegistration/SergipeTest.php
+++ b/tests/StateRegistration/SergipeTest.php
@@ -37,6 +37,7 @@ public function provideValidNumbersAndExpectedFormat() : array
     public function provideEmptyData() : array
     {
         return [
+            [Sergipe::LONG_NAME, null],
             [Sergipe::LONG_NAME, ''],
         ];
     }
diff --git a/tests/StateRegistration/TocantinsTest.php b/tests/StateRegistration/TocantinsTest.php
index da7e230..85b5733 100644
--- a/tests/StateRegistration/TocantinsTest.php
+++ b/tests/StateRegistration/TocantinsTest.php
@@ -42,6 +42,7 @@ public function provideEmptyData() : array
     {
         return [
             [Tocantins::LONG_NAME, ''],
+            [Tocantins::LONG_NAME, null],
         ];
     }
 
diff --git a/tests/VoterTest.php b/tests/VoterTest.php
index 3017dda..fa54b5f 100644
--- a/tests/VoterTest.php
+++ b/tests/VoterTest.php
@@ -40,15 +40,12 @@ public function provideEmptyData() : array
     {
         return [
             [Voter::LABEL, ''],
-            [Voter::LABEL, null],
-            [Voter::LABEL, 0],
         ];
     }
 
     public function provideInvalidNumber() : array
     {
         return [
-            [Voter::LABEL, 1],
             [Voter::LABEL, '123123232323'],
             [Voter::LABEL, '861238979874'],
         ];