Refactoring the package.

* Merge with my own project
* Use drupol/php-conventions
* Increase test coverage
* Use phpspec framework
* Warning when missing tests
* Fix PHPStan warnings
* Fix Coding style
* Optimize algorithm
* Fix type declarations
* Enable strict typing
* Use Github CI instead of Travis

.editorconfig

@@ -1,25 +1,9 @@
-# For more information about the properties used in
-# this file, please see the EditorConfig documentation:
-# http://editorconfig.org/
-
 root = true
 
 [*]
-charset = utf-8
 end_of_line = lf
-indent_size = 4
-indent_style = space
-insert_final_newline = true
-trim_trailing_whitespace = true
-
-[*.md]
-trim_trailing_whitespace = false
-
-[*.{yml,json}]
-# The indent size used in the `package.json` file cannot be changed
-# https://github.com/npm/npm/pull/3180#issuecomment-16336516
-indent_size = 2
+charset = utf-8
+max_line_length = 80
 indent_style = space
-
-[composer.json]
 indent_size = 4
+insert_final_newline = true

.gitattributes

@@ -1,3 +1,11 @@
+/spec export-ignore
+.editorconfig export-ignore
+.gitattributes export-ignore
+.gitignore export-ignore
+.scrutinizer.yml export-ignore
+.travis.yml export-ignore
+phpunit.xml.dist export-ignore
+infection.json.dist export-ignore
+grumphp.yml.dist export-ignore
+phpspec.yml.dist export-ignore
 /tests export-ignore
-/phpunit.xml.dist export-ignore
-/.gitignore export-ignore

.github/CODEOWNERS

@@ -0,0 +1 @@
+* @drupol

.github/CODE_OF_CONDUCT.md

@@ -0,0 +1,46 @@
+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as contributors and maintainers pledge to making participation in our project and our community a harassment-free experience for everyone, regardless of age, body size, disability, ethnicity, gender identity and expression, level of experience, nationality, personal appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable behavior and are expected to take appropriate and fair corrective action in response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or reject comments, commits, code, wiki edits, issues, and other contributions that are not aligned to this Code of Conduct, or to ban temporarily or permanently any contributor for other behaviors that they deem inappropriate, threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces when an individual is representing the project or its community. Examples of representing a project or community include using an official project e-mail address, posting via an official social media account, or acting as an appointed representative at an online or offline event. Representation of a project may be further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by contacting the project team at am@localheinz.com. The project team will review and investigate all complaints, and will respond in a way that it deems appropriate to the circumstances. The project team is obligated to maintain confidentiality with regard to the reporter of an incident. Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good faith may face temporary or permanent repercussions as determined by other members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4, available at [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/

.github/CONTRIBUTING.md

@@ -0,0 +1,29 @@
+# CONTRIBUTING
+
+We're using [Travis CI](https://travis-ci.com) as a continuous integration system.
+
+For details, see [`.travis.yml`](../.travis.yml). 
+
+## Tests
+
+We're using [`grumphp/grumphp`](https://github.com/phpro/grumphp) to drive the development.
+
+Run
+
+```bash
+./vendor/bin/grumphp run
+```
+
+to run all the tests.
+
+## Coding Standards
+
+We are using [`drupol/php-conventions`](https://github.com/drupol/php-conventions) to enforce coding standards.
+
+Run
+
+```bash
+./vendor/bin/grumphp run
+```
+
+to automatically detect/fix coding standard violations.

.github/FUNDING.yml

@@ -0,0 +1 @@
+github: drupol

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,13 @@
+## Steps required to reproduce the problem
+
+1. 
+2. 
+3. 
+
+## Expected Result
+
+* 
+
+## Actual Result
+
+* 

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,9 @@
+This PR
+
+* [x] 
+* [ ] 
+* [ ] 
+
+Follows #.
+Related to #.
+Fixes #.

.github/settings.yml

@@ -0,0 +1,49 @@
+# https://github.com/probot/settings
+
+branches:
+    - name: master
+      protection:
+          enforce_admins: false
+          required_pull_request_reviews:
+              dismiss_stale_reviews: true
+              require_code_owner_reviews: true
+              required_approving_review_count: 1
+          required_status_checks:
+              contexts:
+                  -  "Grumphp"
+              strict: false
+          restrictions: null
+
+labels:
+    - name: bug
+      color: ee0701
+
+    - name: dependencies
+      color: 0366d6
+
+    - name: enhancement
+      color: 0e8a16
+
+    - name: question
+      color: cc317c
+
+    - name: security
+      color: ee0701
+
+    - name: stale
+      color: eeeeee
+
+repository:
+    allow_merge_commit: true
+    allow_rebase_merge: false
+    allow_squash_merge: false
+    default_branch: master
+    description: "Taxpayer Identification Number (TIN) Validator"
+    topics: tin,taxpayer-identification-number,validator
+    has_downloads: true
+    has_issues: true
+    has_pages: false
+    has_projects: false
+    has_wiki: false
+    name: tin
+    private: false

.github/stale.yml

@@ -0,0 +1,10 @@
+daysUntilStale: 60
+
+daysUntilClose: 7
+
+staleLabel: stale
+
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.

.github/workflows/continuous-integration.yml

@@ -0,0 +1,57 @@
+# https://help.github.com/en/categories/automating-your-workflow-with-github-actions
+
+on:
+    - pull_request
+    - push
+
+name: "Continuous Integration"
+
+jobs:
+    run:
+        name: "Grumphp"
+        runs-on: ${{ matrix.operating-system }}
+        strategy:
+            fail-fast: false
+            matrix:
+                operating-system: [ubuntu-latest, windows-latest, macOS-latest]
+                php-versions: ['7.1', '7.2', '7.3', '7.4']
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@master
+              with:
+                  fetch-depth: 1
+
+            - name: Install PHP
+              uses: shivammathur/setup-php@master
+              with:
+                  php-version: ${{ matrix.php-versions }}
+                  extensions: mbstring,xdebug,pcov
+            - name: Get Composer Cache Directory
+              id: composer-cache
+              run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+            - name: Cache dependencies
+              uses: actions/cache@v1
+              with:
+                  path: ${{ steps.composer-cache.outputs.dir }}
+                  key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
+                  restore-keys: ${{ runner.os }}-composer-
+
+            - name: Install dependencies
+              run: composer install --no-progress --no-suggest --prefer-dist --optimize-autoloader
+
+            - name: Run Grumphp
+              run: vendor/bin/grumphp run
+              env:
+                  STRYKER_DASHBOARD_API_KEY: ${{ secrets.STRYKER_DASHBOARD_API_KEY }}
+
+            - name: Send PSALM data
+              run: vendor/bin/psalm --shepherd --stats
+              continue-on-error: true
+
+            - name: Scrutinizer
+              run: |
+                  wget https://scrutinizer-ci.com/ocular.phar
+                  php ocular.phar code-coverage:upload --format=php-clover build/logs/clover.xml
+              continue-on-error: true

.gitignore

@@ -1,3 +1,9 @@
-vendor/
-composer.lock
-phpunit.xml
+/composer.lock
+/vendor
+/build
+/.php_cs.cache
+/example/
+/.idea/
+/test.php
+/phpspec.yml
+/infection.json

.scrutinizer.yml

@@ -1,15 +1,21 @@
-inherit: true
-
 build:
-  nodes:
-    analysis:
-      tests:
-        override: [php-scrutinizer-run]
-
-checks:
-  php:
-    code_rating: true
-    duplication: true
+    nodes:
+        analysis:
+            environment:
+                php:
+                    version: 7.4
+            tests:
+                override:
+                    - php-scrutinizer-run
 
 filter:
-  paths: [src/*, tests/*]
+    paths:
+        - 'src/*'
+
+tools:
+    external_code_coverage:
+        timeout: 600
+    php_loc: true
+    php_pdepend: true
+    php_sim: true
+    php_changetracking: true

LICENSE.md

@@ -1,6 +1,6 @@
 # The MIT License (MIT)
 
-Copyright (c) 2020 Thomas Portelange
+Copyright (c) 2020 Thomas Portelange, Pol Dellaiera
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 documentation files (the _Software_), to deal in the Software without restriction, including without limitation the