diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
new file mode 100644
index 0000000..f3fbf1b
--- /dev/null
+++ b/.github/workflows/publish.yml
@@ -0,0 +1,24 @@
+name: Publish
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Publish Packages
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          bundler-cache: true
+
+      - name: Publish to RubyGems
+        uses: dawidd6/action-publish-gem@v1
+        with:
+          api_key: ${{secrets.RUBYGEMS_AUTH_TOKEN}}
+
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..1f48ab1
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,54 @@
+name: Test
+
+on:
+  pull_request:
+
+  push:
+    branches: [ develop, master ]
+
+env:
+  GIT_COMMIT_SHA: ${{ github.sha }}
+  GIT_BRANCH: ${{ github.ref }}
+  COVERALLS_REPO_TOKEN: ${{ secrets.COVERALLS_REPO_TOKEN }}
+
+jobs:
+
+  lint:
+    runs-on: ubuntu-latest
+    name: lint ${{ matrix.ruby }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.6.9', '2.7.5', '3.0.3', '3.1.1' ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: StandardRB
+        continue-on-error: ${{ matrix.experimental }}
+        run: bundle exec standardrb --parallel --format progress
+
+  test:
+    needs: [ lint ]
+    runs-on: ubuntu-latest
+    name: test ${{ matrix.ruby }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.6.9', '2.7.5', '3.0.3', '3.1.1' ]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Test
+        continue-on-error: ${{ matrix.experimental }}
+        run: bundle exec rake
+
diff --git a/.ruby-gemset b/.ruby-gemset
deleted file mode 100644
index 55fdc27..0000000
--- a/.ruby-gemset
+++ /dev/null
@@ -1 +0,0 @@
-guessmail
diff --git a/.ruby-version b/.ruby-version
deleted file mode 100644
index bff6ce5..0000000
--- a/.ruby-version
+++ /dev/null
@@ -1 +0,0 @@
-ruby-2.7.1
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..e7f4c11
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.1.1
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 8e27c59..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,3 +0,0 @@
-language: ruby
-rvm:
-  - 2.7.1
diff --git a/Gemfile b/Gemfile
index 26b1452..9a4f4dc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 
-source 'https://rubygems.org'
+source "https://rubygems.org"
 
 # Specify your gem's dependencies in guessmail.gemspec
 gemspec
diff --git a/LICENSE.txt b/LICENSE.txt
new file mode 100644
index 0000000..4481351
--- /dev/null
+++ b/LICENSE.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2022 Kerem Bozdas
+
+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 rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
index e68ae0f..a81b737 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,11 @@
 # Guessmail 💌
 
-[![Travis](https://img.shields.io/travis/krmbzds/guessmail.svg)](https://travis-ci.org/krmbzds/guessmail)
-[![Gem](https://img.shields.io/gem/dt/guessmail.svg)](https://rubygems.org/gems/guessmail)
-[![Gem](https://img.shields.io/gem/v/guessmail.svg)](https://rubygems.org/gems/guessmail)
+[![Build Status](https://img.shields.io/github/workflow/status/krmbzds/guessmail/Test/master)](https://github.com/krmbzds/guessmail/actions/workflows/test.yml)
+[![Coveralls](https://img.shields.io/coveralls/github/krmbzds/guessmail)](https://coveralls.io/github/krmbzds/guessmail) 
+[![Maintainability](https://img.shields.io/codeclimate/maintainability/krmbzds/guessmail.svg)](https://codeclimate.com/github/krmbzds/guessmail/maintainability)
+[![Downloads](https://img.shields.io/gem/dt/guessmail.svg)](https://rubygems.org/gems/guessmail)
+[![Gem Version](https://img.shields.io/gem/v/guessmail.svg)](https://rubygems.org/gems/guessmail)
+
 
 [**guessmail**][Guessmail] helps you find possible email addresses of a person.
 
@@ -101,7 +104,7 @@ You can donate me at [Liberapay][Donation]. Thanks! ☕️
 
 ## License
 
-Copyright © 2016-2020 [Kerem Bozdas][Personal Webpage]
+Copyright © 2016-2022 [Kerem Bozdas][Personal Webpage]
 
 This project is available under the terms of the [MIT License][License].
 
diff --git a/Rakefile b/Rakefile
index 82bb534..b6ae734 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
-require 'bundler/gem_tasks'
-require 'rspec/core/rake_task'
+require "bundler/gem_tasks"
+require "rspec/core/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
 
diff --git a/guessmail.gemspec b/guessmail.gemspec
index 00d7523..9b03912 100644
--- a/guessmail.gemspec
+++ b/guessmail.gemspec
@@ -1,26 +1,28 @@
 # frozen_string_literal: true
 
-lib = File.expand_path('lib', __dir__)
+lib = File.expand_path("lib", __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
-require 'guessmail/version'
+require "guessmail/version"
 
 Gem::Specification.new do |spec|
-  spec.name          = 'guessmail'
-  spec.version       = Guessmail::VERSION
-  spec.authors       = ['Kerem Bozdas']
-  spec.email         = ['krmbzds.github@gmail.com']
+  spec.name = "guessmail"
+  spec.version = Guessmail::VERSION
+  spec.authors = ["Kerem Bozdas"]
+  spec.email = ["krmbzds.github@gmail.com"]
 
-  spec.summary       = "Find anyone's email address"
-  spec.description   = "Find anyone's email address"
-  spec.homepage      = 'https://github.com/krmbzds/guessmail'
+  spec.summary = "Find anyone's email address"
+  spec.description = "Find anyone's email address"
+  spec.homepage = "https://github.com/krmbzds/guessmail"
 
-  spec.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
-  spec.bindir        = 'bin'
-  spec.executables   = ['guessmail']
-  spec.require_paths = ['lib']
+  spec.files = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
+  spec.bindir = "bin"
+  spec.executables = ["guessmail"]
+  spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency 'tate', '~> 1.6.0'
-  spec.add_development_dependency 'bundler'
-  spec.add_development_dependency 'rake'
-  spec.add_development_dependency 'rspec'
+  spec.add_runtime_dependency "tate", "~> 1.7.0"
+  spec.add_development_dependency "bundler"
+  spec.add_development_dependency "rake"
+  spec.add_development_dependency "rspec"
+  spec.add_development_dependency "standardrb"
+  spec.add_development_dependency "coveralls_reborn"
 end
diff --git a/lib/guessmail.rb b/lib/guessmail.rb
index ab9b6eb..1903ed7 100644
--- a/lib/guessmail.rb
+++ b/lib/guessmail.rb
@@ -1,11 +1,11 @@
 # frozen_string_literal: true
 
-lib = File.expand_path(File.dirname(__FILE__) + '/../lib')
+lib = File.expand_path(File.dirname(__FILE__) + "/../lib")
 $LOAD_PATH.unshift(lib) if File.directory?(lib) && !$LOAD_PATH.include?(lib)
 
-require 'guessmail/version'
-require 'tate'
-require 'templates'
+require "guessmail/version"
+require "tate"
+require "templates"
 
 module Guessmail
   def self.guess(names, options)
@@ -16,8 +16,12 @@ def self.guess(names, options)
     ln = names.pop
     mn = names.pop
 
-    params = { fn: fn, mn: mn, ln: ln, fi: fn[0], mi: (mn[0] if mn), li: ln[0], dn: dn }
-    template = options[:extended] ? (mn ? FMLE : FLE) : (mn ? FL : FML)
+    params = {fn: fn, mn: mn, ln: ln, fi: fn[0], mi: (mn[0] if mn), li: ln[0], dn: dn}
+    template = if options[:extended]
+      mn ? FMLE : FLE
+    else
+      (mn ? FML : FL)
+    end
     string = format(template, params)
 
     Tate.transliterate(string, options[:language])
diff --git a/lib/guessmail/version.rb b/lib/guessmail/version.rb
index 8ef652d..7a5282d 100644
--- a/lib/guessmail/version.rb
+++ b/lib/guessmail/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module Guessmail
-  VERSION = '0.2.0'
+  VERSION = "0.2.0"
 end
diff --git a/spec/guessmail_spec.rb b/spec/guessmail_spec.rb
index 444b60d..b683a04 100644
--- a/spec/guessmail_spec.rb
+++ b/spec/guessmail_spec.rb
@@ -1,9 +1,39 @@
 # frozen_string_literal: true
 
-require 'spec_helper'
+require "spec_helper"
 
 describe Guessmail do
-  it 'has a version number' do
+  it "has a version number" do
     expect(Guessmail::VERSION).not_to be nil
   end
+
+  it "returns guesses" do
+    guess = Guessmail.guess(["F", "L", "D"], {extended: false})
+    expected = "f@d\nl@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\n"
+    expect(guess).to eq expected
+  end
+
+  it "returns extended guesses" do
+    guess = Guessmail.guess(["F", "L", "D"], {extended: true})
+    expected = "f@d\nl@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nf-l@d\nf-l@d\nf-l@d\nf-l@d\nl-f@d\nl-f@d\nl-f@d\nl-f@d\nf_l@d\nf_l@d\nf_l@d\nf_l@d\nl_f@d\nl_f@d\nl_f@d\nl_f@d\n"
+    expect(guess).to eq expected
+  end
+
+  it "returns guesses with middle name" do
+    guess = Guessmail.guess(["F", "M", "L", "D"], {extended: false})
+    expected = "f@d\nl@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nfml@d\nfm.l@d\nfml@d\nf.m.l@d\nfml@d\nf.m.l@d\nm@d\n"
+    expect(guess).to eq expected
+  end
+
+  it "returns extended guesses with middle name" do
+    guess = Guessmail.guess(["F", "M", "L", "D"], {extended: true})
+    expected = "f@d\nl@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nfl@d\nf.l@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nlf@d\nl.f@d\nfml@d\nfm.l@d\nfml@d\nf.m.l@d\nfml@d\nf.m.l@d\nf-l@d\nf-l@d\nf-l@d\nf-l@d\nl-f@d\nl-f@d\nl-f@d\nl-f@d\nfm-l@d\nf-m-l@d\nf-m-l@d\nf_l@d\nf_l@d\nf_l@d\nf_l@d\nl_f@d\nl_f@d\nl_f@d\nl_f@d\nfm_l@d\nf_m_l@d\nf_m_l@d\nm@d\n"
+    expect(guess).to eq expected
+  end
+
+  it "returns guesses for custom language" do
+    guess = Guessmail.guess(["Ö", "Ü", "D"], {extended: false, language: "de"})
+    expected = "oe@d\nue@d\noeue@d\noe.ue@d\noeue@d\noe.ue@d\noeue@d\noe.ue@d\noeue@d\noe.ue@d\nueoe@d\nue.oe@d\nueoe@d\nue.oe@d\nueoe@d\nue.oe@d\nueoe@d\nue.oe@d\n"
+    expect(guess).to eq expected
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 5544456..47baed9 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,4 +1,7 @@
 # frozen_string_literal: true
 
-$LOAD_PATH.unshift File.expand_path('../lib', __dir__)
-require 'guessmail'
+require "coveralls"
+Coveralls.wear!
+
+$LOAD_PATH.unshift File.expand_path("../lib", __dir__)
+require "guessmail"