diff --git a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/create_new_milestone_action.rb b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/create_new_milestone_action.rb
index 9f3e1ea32..0319057ba 100644
--- a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/create_new_milestone_action.rb
+++ b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/create_new_milestone_action.rb
@@ -11,6 +11,10 @@ def self.run(params)
 
         github_helper = Fastlane::Helper::GithubHelper.new(github_token: params[:github_token])
         last_stone = github_helper.get_last_milestone(repository)
+
+        UI.user_error!('No milestone found on the repository.') if last_stone.nil?
+        UI.user_error!("Milestone #{last_stone[:title]} has no due date.") if last_stone[:due_on].nil?
+
         UI.message("Last detected milestone: #{last_stone[:title]} due on #{last_stone[:due_on]}.")
         milestone_duedate = last_stone[:due_on]
         milestone_duration = params[:milestone_duration]
@@ -49,19 +53,19 @@ def self.available_options
                                        env_name: 'GHHELPER_NEED_APPSTORE_SUBMISSION',
                                        description: 'True if the app needs to be submitted',
                                        optional: true,
-                                       is_string: false,
+                                       type: Boolean,
                                        default_value: false),
           FastlaneCore::ConfigItem.new(key: :milestone_duration,
                                        env_name: 'GHHELPER_MILESTONE_DURATION',
                                        description: 'Milestone duration in number of days',
                                        optional: true,
-                                       is_string: false,
+                                       type: Integer,
                                        default_value: 14),
           FastlaneCore::ConfigItem.new(key: :number_of_days_from_code_freeze_to_release,
                                        env_name: 'GHHELPER_NUMBER_OF_DAYS_FROM_CODE_FREEZE_TO_RELEASE',
                                        description: 'Number of days from code freeze to release',
                                        optional: true,
-                                       is_string: false,
+                                       type: Integer,
                                        default_value: 14),
           Fastlane::Helper::GithubHelper.github_token_config_item,
         ]
diff --git a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/setfrozentag_action.rb b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/setfrozentag_action.rb
index 55d6f8a89..06a2d7595 100644
--- a/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/setfrozentag_action.rb
+++ b/lib/fastlane/plugin/wpmreleasetoolkit/actions/common/setfrozentag_action.rb
@@ -15,7 +15,6 @@ def self.run(params)
         UI.user_error!("Milestone #{milestone_title} not found.") if milestone.nil?
 
         mile_title = milestone[:title]
-        puts freeze
         if freeze
           # Check if the state needs changes
           if is_frozen(milestone)
@@ -71,7 +70,7 @@ def self.available_options
                                        description: 'The GitHub milestone',
                                        optional: false,
                                        default_value: true,
-                                       is_string: false),
+                                       type: Boolean),
           Fastlane::Helper::GithubHelper.github_token_config_item,
         ]
       end
diff --git a/spec/close_milestone_action_spec.rb b/spec/close_milestone_action_spec.rb
new file mode 100644
index 000000000..f6d7b0780
--- /dev/null
+++ b/spec/close_milestone_action_spec.rb
@@ -0,0 +1,65 @@
+require 'spec_helper'
+require 'shared_examples_for_actions_with_github_token'
+
+describe Fastlane::Actions::CloseMilestoneAction do
+  let(:test_repository) { 'test-repository' }
+  let(:test_token) { 'Test-GithubToken-1234' }
+  let(:test_milestone) do
+    { title: '10.1', number: '1234' }
+  end
+  let(:default_params) do
+    { repository: test_repository,
+      milestone: test_milestone[:title],
+      github_token: 'Test-GithubToken-1234' }
+  end
+  let(:client) do
+    instance_double(
+      Octokit::Client,
+      list_milestones: [test_milestone],
+      update_milestone: nil,
+      user: instance_double('User', name: 'test'),
+      'auto_paginate=': nil
+    )
+  end
+
+  before do
+    allow(Octokit::Client).to receive(:new).and_return(client)
+  end
+
+  it 'closes the expected milestone on the expected repository' do
+    expect(client).to receive(:update_milestone).with(test_repository, test_milestone[:number], state: 'closed')
+    run_described_fastlane_action(default_params)
+  end
+
+  it 'raises an error when the milestone is not found or does not exist' do
+    allow(client).to receive(:list_milestones).and_return([])
+    expect { run_described_fastlane_action(default_params) }.to raise_error(FastlaneCore::Interface::FastlaneError, 'Milestone 10.1 not found.')
+  end
+
+  describe 'initialize' do
+    include_examples 'github_token_initialization'
+  end
+
+  describe 'calling the action validates input' do
+    it 'raises an error if no `GHHELPER_REPOSITORY` environment variable nor parameter `:repository` is present' do
+      expect { run_action_without(:repository) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'repository'")
+    end
+
+    it 'raises an error if no `GHHELPER_MILESTONE` environment variable nor parameter `:milestone` is present' do
+      expect { run_action_without(:milestone) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'milestone'")
+    end
+
+    it 'raises an error if `milestone:` parameter is passed as Integer' do
+      expect { run_action_with(milestone: 10) }.to raise_error "'milestone' value must be a String! Found Integer instead."
+    end
+  end
+
+  def run_action_with(**keys_and_values)
+    params = default_params.merge(keys_and_values)
+    run_described_fastlane_action(params)
+  end
+
+  def run_action_without(key)
+    run_described_fastlane_action(default_params.except(key))
+  end
+end
diff --git a/spec/create_new_milestone_action_spec.rb b/spec/create_new_milestone_action_spec.rb
new file mode 100644
index 000000000..1fac210e1
--- /dev/null
+++ b/spec/create_new_milestone_action_spec.rb
@@ -0,0 +1,138 @@
+require 'spec_helper'
+require 'shared_examples_for_actions_with_github_token'
+
+describe Fastlane::Actions::CreateNewMilestoneAction do
+  let(:test_repository) { 'test-repository' }
+  let(:test_milestone) do
+    { title: '10.1', number: '1234', due_on: '2022-10-31T07:00:00Z' }
+  end
+  let(:milestone_list) do
+    [
+      { title: '10.2', number: '1234', due_on: '2022-10-31T12:00:00Z' },
+      { title: '10.3', number: '4567', due_on: '2022-11-02T15:00:00Z' },
+      { title: '10.4', number: '7890', due_on: '2022-11-04T23:59:00Z' },
+    ]
+  end
+  let(:default_params) do
+    { repository: test_repository,
+      need_appstore_submission: false,
+      github_token: 'Test-GithubToken-1234' }
+  end
+  let(:client) do
+    instance_double(
+      Octokit::Client,
+      list_milestones: [test_milestone],
+      create_milestone: nil,
+      user: instance_double('User', name: 'test'),
+      'auto_paginate=': nil
+    )
+  end
+
+  before do
+    allow(Octokit::Client).to receive(:new).and_return(client)
+  end
+
+  describe 'date computation is correct' do
+    it 'computes the correct due date and milestone description' do
+      comment = "Code freeze: November 14, 2022\nApp Store submission: November 28, 2022\nRelease: November 28, 2022\n"
+      expect(client).to receive(:create_milestone).with(test_repository, '10.2', due_on: '2022-11-14T12:00:00Z', description: comment)
+      run_described_fastlane_action(default_params)
+    end
+
+    it 'removes 3 days from the AppStore submission date when `:need_appstore_submission` is true' do
+      comment = "Code freeze: November 14, 2022\nApp Store submission: November 25, 2022\nRelease: November 28, 2022\n"
+      expect(client).to receive(:create_milestone).with(test_repository, '10.2', due_on: '2022-11-14T12:00:00Z', description: comment)
+      run_action_with(need_appstore_submission: true)
+    end
+
+    it 'uses the most recent milestone date to calculate the due date and version of new milestone' do
+      comment = "Code freeze: November 18, 2022\nApp Store submission: December 02, 2022\nRelease: December 02, 2022\n"
+      allow(client).to receive(:list_milestones).and_return(milestone_list)
+      expect(client).to receive(:create_milestone).with(test_repository, '10.5', due_on: '2022-11-18T12:00:00Z', description: comment)
+      run_described_fastlane_action(default_params)
+    end
+
+    context 'when last milestone cannot be used' do
+      it 'raises an error when the due date of milestone does not exists' do
+        allow(client).to receive(:list_milestones).and_return([{ title: '10.1', number: '1234' }])
+        expect { run_described_fastlane_action(default_params) }.to raise_error(FastlaneCore::Interface::FastlaneError, 'Milestone 10.1 has no due date.')
+      end
+
+      it 'raises an error when the milestone is not found or does not exist on the repository' do
+        allow(client).to receive(:list_milestones).and_return([])
+        expect { run_described_fastlane_action(default_params) }.to raise_error(FastlaneCore::Interface::FastlaneError, 'No milestone found on the repository.')
+      end
+    end
+  end
+
+  describe 'initialize' do
+    include_examples 'github_token_initialization'
+
+    context 'when using default parameters' do
+      let(:github_helper) do
+        instance_double(
+          Fastlane::Helper::GithubHelper,
+          get_last_milestone: test_milestone,
+          create_milestone: nil
+        )
+      end
+
+      before do
+        allow(Fastlane::Helper::GithubHelper).to receive(:new).and_return(github_helper)
+      end
+
+      it 'uses default value when neither `GHHELPER_NUMBER_OF_DAYS_FROM_CODE_FREEZE_TO_RELEASE` environment variable nor parameter `:number_of_days_from_code_freeze_to_release` is present' do
+        default_code_freeze_days = 14
+        expect(github_helper).to receive(:create_milestone).with(
+          anything,
+          anything,
+          anything,
+          anything,
+          default_code_freeze_days,
+          anything
+        )
+        run_described_fastlane_action(default_params)
+      end
+
+      it 'uses default value when neither `GHHELPER_MILESTONE_DURATION` environment variable nor parameter `:milestone_duration` is present' do
+        default_milestone_duration = 14
+        expect(github_helper).to receive(:create_milestone).with(
+          anything,
+          anything,
+          anything,
+          default_milestone_duration,
+          anything,
+          anything
+        )
+        run_described_fastlane_action(default_params)
+      end
+    end
+  end
+
+  describe 'calling the action validates input' do
+    it 'raises an error if no `GHHELPER_REPOSITORY` environment variable nor parameter `:repository` is present' do
+      expect { run_action_without(:repository) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'repository'")
+    end
+
+    it 'raises an error if `need_appstore_submission:` parameter is passed as String' do
+      expect { run_action_with(need_appstore_submission: 'foo') }.to raise_error "'need_appstore_submission' value must be either `true` or `false`! Found String instead."
+    end
+
+    it 'raises an error if `milestone_duration:` parameter is passed as String' do
+      expect { run_action_with(milestone_duration: 'foo') }.to raise_error "'milestone_duration' value must be a Integer! Found String instead."
+    end
+
+    it 'raises an error if `number_of_days_from_code_freeze_to_release:` parameter is passed as String' do
+      expect { run_action_with(number_of_days_from_code_freeze_to_release: 'foo') }.to raise_error "'number_of_days_from_code_freeze_to_release' value must be a Integer! Found String instead."
+    end
+  end
+
+  def run_action_with(**keys_and_values)
+    params = default_params.merge(keys_and_values)
+    run_described_fastlane_action(params)
+  end
+
+  def run_action_without(key)
+    run_described_fastlane_action(default_params.except(key))
+  end
+end
diff --git a/spec/setfrozentag_action_spec.rb b/spec/setfrozentag_action_spec.rb
new file mode 100644
index 000000000..30fb70c8c
--- /dev/null
+++ b/spec/setfrozentag_action_spec.rb
@@ -0,0 +1,89 @@
+require 'spec_helper'
+require 'shared_examples_for_actions_with_github_token'
+
+describe Fastlane::Actions::SetfrozentagAction do
+  let(:test_repository) { 'test-repository' }
+  let(:test_token) { 'Test-GithubToken-1234' }
+  let(:test_milestone) do
+    { title: '10.1', number: '1234' }
+  end
+  let(:default_params) do
+    {
+      repository: test_repository,
+      milestone: test_milestone[:title],
+      freeze: true,
+      github_token: 'Test-GithubToken-1234'
+    }
+  end
+  let(:client) do
+    instance_double(
+      Octokit::Client,
+      list_milestones: [test_milestone],
+      update_milestone: nil,
+      user: instance_double('User', name: 'test'),
+      'auto_paginate=': nil
+    )
+  end
+
+  before do
+    allow(Octokit::Client).to receive(:new).and_return(client)
+  end
+
+  it 'raises an error when the milestone is not found or does not exist' do
+    allow(client).to receive(:list_milestones).and_return([])
+    expect { run_described_fastlane_action(default_params) }.to raise_error(FastlaneCore::Interface::FastlaneError, 'Milestone 10.1 not found.')
+  end
+
+  it 'freezes the milestone adding ❄️ to the title' do
+    expect(client).to receive(:update_milestone).with(test_repository, test_milestone[:number], title: '10.1 ❄️')
+    run_action_with(freeze: true)
+  end
+
+  it 'remove any existing ❄️ emoji from a frozen milestone' do
+    allow(client).to receive(:list_milestones).and_return([{ title: '10.2 ❄️', number: '1234' }])
+    expect(client).to receive(:update_milestone).with(test_repository, test_milestone[:number], title: '10.2')
+    run_action_with(freeze: false, milestone: '10.2')
+  end
+
+  it 'does not change a milestone that is already frozen' do
+    allow(client).to receive(:list_milestones).and_return([{ title: '10.2 ❄️', number: '1234' }])
+    expect(client).not_to receive(:update_milestone)
+    run_action_with(milestone: '10.2 ❄️')
+  end
+
+  it 'does not change an unfrozen milestone if :freeze parameter is false' do
+    expect(client).to receive(:update_milestone).with(test_repository, test_milestone[:number], title: '10.1')
+    run_action_with(freeze: false)
+  end
+
+  describe 'initialize' do
+    include_examples 'github_token_initialization'
+  end
+
+  describe 'Calling the Action validates input' do
+    it 'raises an error if no `GHHELPER_REPOSITORY` environment variable nor parameter `:repository` is present' do
+      expect { run_action_without(:repository) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'repository'")
+    end
+
+    it 'raises an error if no `GHHELPER_MILESTORE` environment variable nor parameter `:milestone` is present' do
+      expect { run_action_without(:milestone) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'milestone'")
+    end
+
+    it 'raises an error if `:freeze` parameter is passed as String' do
+      expect { run_action_with(freeze: 'foo') }.to raise_error "'freeze' value must be either `true` or `false`! Found String instead."
+    end
+
+    it 'raises an error if `:milestone` parameter is passed as Integer' do
+      expect { run_action_with(milestone: 10) }.to raise_error "'milestone' value must be a String! Found Integer instead."
+    end
+  end
+
+  def run_action_with(**keys_and_values)
+    params = default_params.merge(keys_and_values)
+    run_described_fastlane_action(params)
+  end
+
+  def run_action_without(key)
+    run_described_fastlane_action(default_params.except(key))
+  end
+end
diff --git a/spec/shared_examples_for_actions_with_github_token.rb b/spec/shared_examples_for_actions_with_github_token.rb
new file mode 100644
index 000000000..68a7c17c8
--- /dev/null
+++ b/spec/shared_examples_for_actions_with_github_token.rb
@@ -0,0 +1,29 @@
+require 'spec_helper'
+
+RSpec.shared_examples 'github_token_initialization' do
+  let(:test_token) { 'Test-GithubToken-1234' }
+
+  describe 'GitHub Token is properly passed to the client' do
+    it 'properly passes the environment variable `GITHUB_TOKEN` to Octokit::Client' do
+      ENV['GITHUB_TOKEN'] = test_token
+      expect(Octokit::Client).to receive(:new).with(access_token: test_token)
+      run_action_without(:github_token)
+    end
+
+    it 'properly passes the parameter `:github_token` to Octokit::Client' do
+      expect(Octokit::Client).to receive(:new).with(access_token: test_token)
+      run_described_fastlane_action(default_params)
+    end
+
+    it 'prioritizes `:github_token` parameter over `GITHUB_TOKEN` environment variable if both are present' do
+      ENV['GITHUB_TOKEN'] = 'Test-EnvGithubToken-1234'
+      expect(Octokit::Client).to receive(:new).with(access_token: test_token)
+      run_described_fastlane_action(default_params)
+    end
+
+    it 'raises an error if no `GITHUB_TOKEN` environment variable nor parameter `:github_token` is present' do
+      ENV['GITHUB_TOKEN'] = nil
+      expect { run_action_without(:github_token) }.to raise_error(FastlaneCore::Interface::FastlaneError, "No value found for 'github_token'")
+    end
+  end
+end