diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 0e98934..f62e871 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,13 +1,13 @@
 # This configuration was generated by `rubocop --auto-gen-config`
-# on 2015-05-26 16:00:55 +0300 using RuboCop version 0.31.0.
+# on 2015-06-11 16:35:14 +0300 using RuboCop version 0.31.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 14
+# Offense count: 13
 Metrics/AbcSize:
-  Max: 59
+  Max: 63
 
 # Offense count: 1
 Metrics/CyclomaticComplexity:
@@ -21,7 +21,7 @@ Metrics/PerceivedComplexity:
 Style/AccessorMethodName:
   Enabled: false
 
-# Offense count: 8
+# Offense count: 10
 Style/Documentation:
   Enabled: false
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e037874..05bf30e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Change Log
 
+## [Unreleased](https://github.com/skywinder/github-changelog-generator/tree/HEAD)
+
+[Full Changelog](https://github.com/skywinder/github-changelog-generator/compare/1.5.0...HEAD)
+
+**Fixed bugs:**
+
+- Exclude and Include tags is broken [\#245](https://github.com/skywinder/github-changelog-generator/issues/245)
+
 ## [1.5.0](https://github.com/skywinder/github-changelog-generator/tree/1.5.0) (2015-05-26)
 
 [Full Changelog](https://github.com/skywinder/github-changelog-generator/compare/1.4.1...1.5.0)
diff --git a/github_changelog_generator.gemspec b/github_changelog_generator.gemspec
index ff4c3cc..6f4c59d 100644
--- a/github_changelog_generator.gemspec
+++ b/github_changelog_generator.gemspec
@@ -23,9 +23,10 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 1.7"
-  spec.add_development_dependency "rake", "~> 10.0"
-
   spec.add_runtime_dependency("github_api", ["~> 0.12"])
   spec.add_runtime_dependency("colorize", ["~> 0.7"])
+
+  # Development only
+  spec.add_development_dependency "bundler", "~> 1.7"
+  spec.add_development_dependency "rake", "~> 10.0"
 end
diff --git a/lib/github_changelog_generator.rb b/lib/github_changelog_generator.rb
index c35db79..3b1e60f 100755
--- a/lib/github_changelog_generator.rb
+++ b/lib/github_changelog_generator.rb
@@ -5,6 +5,7 @@ require "json"
 require "colorize"
 require "benchmark"
 
+require_relative "github_changelog_generator/helper"
 require_relative "github_changelog_generator/parser"
 require_relative "github_changelog_generator/generator/generator"
 require_relative "github_changelog_generator/version"
diff --git a/lib/github_changelog_generator/fetcher.rb b/lib/github_changelog_generator/fetcher.rb
index 5fb3c57..d18273f 100644
--- a/lib/github_changelog_generator/fetcher.rb
+++ b/lib/github_changelog_generator/fetcher.rb
@@ -1,11 +1,10 @@
-require "logger"
-
 module GitHubChangelogGenerator
   # A Fetcher responsible for all requests to GitHub and all basic manipulation with related data
   # (such as filtering, validating, e.t.c)
   #
   # Example:
   # fetcher = GitHubChangelogGenerator::Fetcher.new options
+
   class Fetcher
     PER_PAGE_NUMBER = 30
     CHANGELOG_GITHUB_TOKEN = "CHANGELOG_GITHUB_TOKEN"
@@ -16,16 +15,9 @@ module GitHubChangelogGenerator
 
     def initialize(options = {})
       @options = options || {}
-
-      @logger = Logger.new(STDOUT)
-      @logger.formatter = proc do |_severity, _datetime, _progname, msg|
-        "#{msg}\n"
-      end
-
       @user = @options[:user]
       @project = @options[:project]
       @github_token = fetch_github_token
-      @tag_times_hash = {}
       github_options = { per_page: PER_PAGE_NUMBER }
       github_options[:oauth_token] = @github_token unless @github_token.nil?
       github_options[:endpoint] = @options[:github_endpoint] unless @options[:github_endpoint].nil?
@@ -41,7 +33,7 @@ module GitHubChangelogGenerator
     def fetch_github_token
       env_var = @options[:token] ? @options[:token] : (ENV.fetch CHANGELOG_GITHUB_TOKEN, nil)
 
-      @logger.warn NO_TOKEN_PROVIDED.yellow unless env_var
+      Helper.log.warn NO_TOKEN_PROVIDED.yellow unless env_var
 
       env_var
     end
@@ -51,27 +43,28 @@ module GitHubChangelogGenerator
     def get_all_tags
       print "Fetching tags...\r" if @options[:verbose]
 
-      tags = []
-
-      check_github_response { github_fetch_tags(tags) }
-
-      tags
+      check_github_response { github_fetch_tags }
     end
 
+    # This is wrapper with rescue block
+    # @return [Object] returns exactly the same, what you put in the block, but wrap it with begin-rescue block
     def check_github_response
       begin
         value = yield
       rescue Github::Error::Unauthorized => e
-        @logger.error e.body.red
+        Helper.log.error e.body.red
         abort "Error: wrong GitHub token"
       rescue Github::Error::Forbidden => e
-        @logger.warn e.body.red
-        @logger.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
+        Helper.log.warn e.body.red
+        Helper.log.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
       end
       value
     end
 
-    def github_fetch_tags(tags)
+    # Fill input array with tags
+    # @return [Array] array of tags in repo
+    def github_fetch_tags
+      tags = []
       response = @github.repos.tags @options[:user], @options[:project]
       page_i = 0
       count_pages = response.count_pages
@@ -83,11 +76,12 @@ module GitHubChangelogGenerator
       print_empty_line
 
       if tags.count == 0
-        @logger.warn "Warning: Can't find any tags in repo.\
+        Helper.log.warn "Warning: Can't find any tags in repo.\
 Make sure, that you push tags to remote repo via 'git push --tags'".yellow
       else
-        @logger.info "Found #{tags.count} tags"
+        Helper.log.info "Found #{tags.count} tags"
       end
+      tags
     end
 
     # This method fetch all closed issues and separate them to pull requests and pure issues
@@ -112,10 +106,10 @@ Make sure, that you push tags to remote repo via 'git push --tags'".yellow
           break if @options[:max_issues] && issues.length >= @options[:max_issues]
         end
         print_empty_line
-        @logger.info "Received issues: #{issues.count}"
+        Helper.log.info "Received issues: #{issues.count}"
 
       rescue
-        @logger.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
+        Helper.log.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
       end
 
       # separate arrays of issues and pull requests:
@@ -140,17 +134,20 @@ Make sure, that you push tags to remote repo via 'git push --tags'".yellow
         end
         print_empty_line
       rescue
-        @logger.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
+        Helper.log.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
       end
 
-      @logger.info "Fetching merged dates: #{pull_requests.count}"
+      Helper.log.info "Fetching merged dates: #{pull_requests.count}"
       pull_requests
     end
 
+    # Print specified line on the same string
+    # @param [String] log_string
     def print_in_same_line(log_string)
       print log_string + "\r"
     end
 
+    # Print long line with spaces on same line to clear prev message
     def print_empty_line
       print_in_same_line("                                                                       ")
     end
@@ -170,7 +167,7 @@ Make sure, that you push tags to remote repo via 'git push --tags'".yellow
                                                repo: @options[:project],
                                                issue_number: issue["number"]
             rescue
-              @logger.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
+              Helper.log.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
             end
             issue[:events] = obj.body
             print_in_same_line("Fetching events for issues and PR: #{i + 1}/#{issues.count}")
@@ -184,32 +181,26 @@ Make sure, that you push tags to remote repo via 'git push --tags'".yellow
       # to clear line from prev print
       print_empty_line
 
-      @logger.info "Fetching events for issues and PR: #{i}"
+      Helper.log.info "Fetching events for issues and PR: #{i}"
     end
 
-    # Try to find tag date in local hash.
-    # Otherwise fFetch tag time and put it to local hash file.
-    # @param [String] tag_name name of the tag
+    # Fetch tag time from repo
+    #
+    # @param [Hash] tag
     # @return [Time] time of specified tag
-    def get_time_of_tag(tag_name)
-      fail ChangelogGeneratorError, "tag_name is nil".red if tag_name.nil?
-
-      if @tag_times_hash[tag_name["name"]]
-        return @tag_times_hash[tag_name["name"]]
-      end
-
+    def fetch_date_of_tag(tag)
       begin
-        github_git_data_commits_get = @github.git_data.commits.get @options[:user],
-                                                                   @options[:project],
-                                                                   tag_name["commit"]["sha"]
+        commit_data = @github.git_data.commits.get @options[:user],
+                                                   @options[:project],
+                                                   tag["commit"]["sha"]
       rescue
-        @logger.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
+        Helper.log.warn GH_RATE_LIMIT_EXCEEDED_MSG.yellow
       end
-      time_string = github_git_data_commits_get["committer"]["date"]
-      @tag_times_hash[tag_name["name"]] = Time.parse(time_string)
+      time_string = commit_data["committer"]["date"]
+      Time.parse(time_string)
     end
 
-    # Fetch commit for specifed event
+    # Fetch commit for specified event
     # @return [Hash]
     def fetch_commit(event)
       @github.git_data.commits.get @options[:user], @options[:project], event[:commit_id]
diff --git a/lib/github_changelog_generator/generator/generator.rb b/lib/github_changelog_generator/generator/generator.rb
index 3ac896d..e6b4e6f 100644
--- a/lib/github_changelog_generator/generator/generator.rb
+++ b/lib/github_changelog_generator/generator/generator.rb
@@ -1,4 +1,4 @@
-require "github_changelog_generator/fetcher"
+require_relative "../fetcher"
 require_relative "generator_generation"
 require_relative "generator_fetcher"
 require_relative "generator_processor"
@@ -10,7 +10,7 @@ module GitHubChangelogGenerator
   end
 
   class Generator
-    attr_accessor :options, :all_tags, :github
+    attr_accessor :options, :filtered_tags, :github
 
     # A Generator responsible for all logic, related with change log generation from ready-to-parse issues
     #
@@ -19,7 +19,7 @@ module GitHubChangelogGenerator
     #   content = generator.compound_changelog
     def initialize(options = nil)
       @options = options || {}
-
+      @tag_times_hash = {}
       @fetcher = GitHubChangelogGenerator::Fetcher.new @options
     end
 
@@ -104,12 +104,12 @@ module GitHubChangelogGenerator
       issues.each do |dict|
         added = false
         dict.labels.each do |label|
-          if label.name == "bug"
+          if @options[:bug_labels].include? label.name
             bugs_a.push dict
             added = true
             next
           end
-          if label.name == "enhancement"
+          if @options[:enhancement_labels].include? label.name
             enhancement_a.push dict
             added = true
             next
diff --git a/lib/github_changelog_generator/generator/generator_fetcher.rb b/lib/github_changelog_generator/generator/generator_fetcher.rb
index 3b15769..16c5e5c 100644
--- a/lib/github_changelog_generator/generator/generator_fetcher.rb
+++ b/lib/github_changelog_generator/generator/generator_fetcher.rb
@@ -17,11 +17,11 @@ module GitHubChangelogGenerator
       # Async fetching tags:
       threads = []
       i = 0
-      all = @all_tags.count
-      @all_tags.each do |tag|
+      all = @filtered_tags.count
+      @filtered_tags.each do |tag|
         print "                                 \r"
         threads << Thread.new do
-          @fetcher.get_time_of_tag(tag)
+          get_time_of_tag(tag)
           print "Fetching tags dates: #{i + 1}/#{all}\r" if @options[:verbose]
           i += 1
         end
diff --git a/lib/github_changelog_generator/generator/generator_generation.rb b/lib/github_changelog_generator/generator/generator_generation.rb
index 5571359..634cbe1 100644
--- a/lib/github_changelog_generator/generator/generator_generation.rb
+++ b/lib/github_changelog_generator/generator/generator_generation.rb
@@ -5,6 +5,7 @@ module GitHubChangelogGenerator
     # @return [String] Generated change log file
     def compound_changelog
       fetch_and_filter_tags
+      sort_tags_by_date(@filtered_tags)
       fetch_issues_and_pr
 
       log = "# Change Log\n\n"
@@ -24,7 +25,7 @@ module GitHubChangelogGenerator
       tag1 = @options[:tag1]
       tag2 = @options[:tag2]
       tags_strings = []
-      all_tags.each { |x| tags_strings.push(x["name"]) }
+      filtered_tags.each { |x| tags_strings.push(x["name"]) }
 
       if tags_strings.include?(tag1)
         if tags_strings.include?(tag2)
@@ -128,11 +129,11 @@ module GitHubChangelogGenerator
 
       log = generate_unreleased_section
 
-      (1...all_tags.size).each do |index|
-        log += generate_log_between_tags(all_tags[index], all_tags[index - 1])
+      (1...filtered_tags.size).each do |index|
+        log += generate_log_between_tags(filtered_tags[index], filtered_tags[index - 1])
       end
-      if @all_tags.count != 0
-        log += generate_log_between_tags(nil, all_tags.last)
+      if @filtered_tags.count != 0
+        log += generate_log_between_tags(nil, filtered_tags.last)
       end
 
       log
@@ -141,7 +142,7 @@ module GitHubChangelogGenerator
     def generate_unreleased_section
       log = ""
       if @options[:unreleased]
-        unreleased_log = generate_log_between_tags(all_tags[0], nil)
+        unreleased_log = generate_log_between_tags(filtered_tags[0], nil)
         log += unreleased_log if unreleased_log
       end
       log
diff --git a/lib/github_changelog_generator/generator/generator_processor.rb b/lib/github_changelog_generator/generator/generator_processor.rb
index f95142c..d162cbc 100644
--- a/lib/github_changelog_generator/generator/generator_processor.rb
+++ b/lib/github_changelog_generator/generator/generator_processor.rb
@@ -36,7 +36,7 @@ module GitHubChangelogGenerator
           false
         else
           # check, that this milestone in tag list:
-          milestone_is_tag = @all_tags.find do |tag|
+          milestone_is_tag = @filtered_tags.find do |tag|
             tag.name == issue.milestone.title
           end
 
@@ -57,7 +57,7 @@ module GitHubChangelogGenerator
           true
         else
           # check, that this milestone in tag list:
-          @all_tags.find { |tag| tag.name == issue.milestone.title }.nil?
+          @filtered_tags.find { |tag| tag.name == issue.milestone.title }.nil?
         end
       end
     end
@@ -72,8 +72,8 @@ module GitHubChangelogGenerator
       # in case if not tags specified - return unchanged array
       return array if older_tag.nil? && newer_tag.nil?
 
-      newer_tag_time = newer_tag && @fetcher.get_time_of_tag(newer_tag)
-      older_tag_time = older_tag && @fetcher.get_time_of_tag(older_tag)
+      newer_tag_time = newer_tag && get_time_of_tag(newer_tag)
+      older_tag_time = older_tag && get_time_of_tag(older_tag)
 
       array.select do |req|
         if req[hash_key]
diff --git a/lib/github_changelog_generator/generator/generator_tags.rb b/lib/github_changelog_generator/generator/generator_tags.rb
index 6873c10..123c155 100644
--- a/lib/github_changelog_generator/generator/generator_tags.rb
+++ b/lib/github_changelog_generator/generator/generator_tags.rb
@@ -2,15 +2,34 @@ module GitHubChangelogGenerator
   class Generator
     # fetch, filter tags, fetch dates and sort them in time order
     def fetch_and_filter_tags
-      @all_tags = get_filtered_tags(@fetcher.get_all_tags)
+      @filtered_tags = get_filtered_tags(@fetcher.get_all_tags)
       fetch_tags_dates
-      sort_tags_by_date
     end
 
     # Sort all tags by date
-    def sort_tags_by_date
+    def sort_tags_by_date(tags)
       puts "Sorting tags..." if @options[:verbose]
-      @all_tags.sort_by! { |x| @fetcher.get_time_of_tag(x) }.reverse!
+      tags.sort_by! do |x|
+        get_time_of_tag(x)
+      end.reverse!
+    end
+
+    # Try to find tag date in local hash.
+    # Otherwise fFetch tag time and put it to local hash file.
+    # @param [Hash] tag_name name of the tag
+    # @return [Time] time of specified tag
+    def get_time_of_tag(tag_name)
+      fail ChangelogGeneratorError, "tag_name is nil".red if tag_name.nil?
+
+      name_of_tag = tag_name["name"]
+      time_for_name = @tag_times_hash[name_of_tag]
+      if !time_for_name.nil?
+        time_for_name
+      else
+        time_string = @fetcher.fetch_date_of_tag tag_name
+        @tag_times_hash[name_of_tag] = time_string
+        time_string
+      end
     end
 
     # Detect link, name and time for specified tag.
@@ -19,7 +38,7 @@ module GitHubChangelogGenerator
     # @return [Array] link, name and time of the tag
     def detect_link_tag_time(newer_tag)
       # if tag is nil - set current time
-      newer_tag_time = newer_tag.nil? ? Time.new : @fetcher.get_time_of_tag(newer_tag)
+      newer_tag_time = newer_tag.nil? ? Time.new : get_time_of_tag(newer_tag)
 
       # if it's future release tag - set this value
       if newer_tag.nil? && @options[:future_release]
diff --git a/lib/github_changelog_generator/helper.rb b/lib/github_changelog_generator/helper.rb
new file mode 100644
index 0000000..7c13407
--- /dev/null
+++ b/lib/github_changelog_generator/helper.rb
@@ -0,0 +1,37 @@
+require "logger"
+module GitHubChangelogGenerator
+  module Helper
+    # @return true if the currently running program is a unit test
+    def self.test?
+      defined?SpecHelper
+    end
+
+    if test?
+      @log ||= Logger.new(nil) # don't show any logs when running tests
+    else
+      @log ||= Logger.new(STDOUT)
+    end
+    @log.formatter = proc do |severity, _datetime, _progname, msg|
+      string = "#{msg}\n"
+
+      if severity == "DEBUG"
+        string = string.magenta
+      elsif severity == "INFO"
+        string = string.white
+      elsif severity == "WARN"
+        string = string.yellow
+      elsif severity == "ERROR"
+        string = string.red
+      elsif severity == "FATAL"
+        string = string.red.bold
+      end
+
+      string
+    end
+
+    # Logging happens using this method
+    class << self
+      attr_reader :log
+    end
+  end
+end
diff --git a/lib/github_changelog_generator/parser.rb b/lib/github_changelog_generator/parser.rb
index 683b294..2f252d9 100644
--- a/lib/github_changelog_generator/parser.rb
+++ b/lib/github_changelog_generator/parser.rb
@@ -2,7 +2,7 @@
 require "optparse"
 require "pp"
 require_relative "version"
-
+require_relative "helper"
 module GitHubChangelogGenerator
   class Parser
     # parse options with optparse
@@ -13,7 +13,9 @@ module GitHubChangelogGenerator
 
       parser.parse!
 
-      detect_user_and_project(options)
+      if options[:user].nil? || options[:project].nil?
+        detect_user_and_project(options)
+      end
 
       if !options[:user] || !options[:project]
         puts parser.banner
@@ -21,7 +23,7 @@ module GitHubChangelogGenerator
       end
 
       if options[:verbose]
-        puts "Performing task with options:"
+        Helper.log.info "Performing task with options:"
         pp options
         puts ""
       end
@@ -84,6 +86,12 @@ module GitHubChangelogGenerator
         opts.on("--exclude-labels  x,y,z", Array, 'Issues with the specified labels will be always excluded from changelog. Default is \'duplicate,question,invalid,wontfix\'') do |list|
           options[:exclude_labels] = list
         end
+        opts.on("--bug-labels  x,y,z", Array, 'Issues with the specified labels will be always added to "Fixed bugs" section. Default is \'bug,Bug\'') do |list|
+          options[:bug_labels] = list
+        end
+        opts.on("--enhancement-labels  x,y,z", Array, 'Issues with the specified labels will be always added to "Implemented enhancements" section. Default is \'enhancement,Enhancement\'') do |list|
+          options[:enhancement_labels] = list
+        end
         opts.on("--between-tags  x,y,z", Array, "Change log will be filled only between specified tags") do |list|
           options[:between_tags] = list
         end
@@ -136,8 +144,9 @@ module GitHubChangelogGenerator
         unreleased: true,
         unreleased_label: "Unreleased",
         compare_link: true,
-        include_labels: %w(bug enhancement),
-        exclude_labels: %w(duplicate question invalid wontfix),
+        enhancement_labels: %w(enhancement Enhancement),
+        bug_labels: %w(bug Bug),
+        exclude_labels: %w(duplicate question invalid wontfix Duplicate Question Invalid Wontfix),
         max_issues: nil,
         simple_list: false,
         verbose: true,
diff --git a/lib/github_changelog_generator/version.rb b/lib/github_changelog_generator/version.rb
index c453d07..9a539e6 100644
--- a/lib/github_changelog_generator/version.rb
+++ b/lib/github_changelog_generator/version.rb
@@ -1,3 +1,3 @@
 module GitHubChangelogGenerator
-  VERSION = "1.5.0"
+  VERSION = "1.6.0"
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index dccfbf0..5c4749d 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -19,6 +19,10 @@ require "codeclimate-test-reporter"
 require "simplecov"
 require "coveralls"
 
+# This module is only used to check the environment is currently a testing env
+module SpecHelper
+end
+
 SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter[
   Coveralls::SimpleCov::Formatter,
   SimpleCov::Formatter::HTMLFormatter,
diff --git a/spec/unit/fetcher_spec.rb b/spec/unit/fetcher_spec.rb
index 6baf815..bba0c19 100644
--- a/spec/unit/fetcher_spec.rb
+++ b/spec/unit/fetcher_spec.rb
@@ -52,7 +52,7 @@ describe GitHubChangelogGenerator::Fetcher do
         @fetcher = GitHubChangelogGenerator::Fetcher.new(options)
       end
       it "should raise Unauthorized error" do
-        expect { @fetcher.github_fetch_tags [] }.to raise_error Github::Error::Unauthorized
+        expect { @fetcher.github_fetch_tags }.to raise_error Github::Error::Unauthorized
       end
     end
   end
diff --git a/spec/unit/generator/generator_tags_spec.rb b/spec/unit/generator/generator_tags_spec.rb
index bc28290..5dd00c2 100644
--- a/spec/unit/generator/generator_tags_spec.rb
+++ b/spec/unit/generator/generator_tags_spec.rb
@@ -1,3 +1,18 @@
+def tag_mash_with_name(tag)
+  mash_tag = Hashie::Mash.new
+  mash_tag.name = tag
+  mash_tag
+end
+
+def tags_mash_from_strings(tags_strings)
+  mash_array = []
+  tags_strings.each do |tag|
+    mash_tag = tag_mash_with_name(tag)
+    mash_array << mash_tag
+  end
+  mash_array
+end
+
 describe GitHubChangelogGenerator::Generator do
   describe "#filter_between_tags" do
     context "when between_tags nil" do
@@ -46,16 +61,6 @@ describe GitHubChangelogGenerator::Generator do
     end
   end
 
-  def tags_mash_from_strings(tags_strings)
-    mash_array = []
-    tags_strings.each do |tag|
-      mash_tag = Hashie::Mash.new
-      mash_tag.name = tag
-      mash_array << mash_tag
-    end
-    mash_array
-  end
-
   describe "#get_filtered_tags" do
     subject do
       generator.get_filtered_tags(tags_mash_from_strings(%w(1 2 3 4 5)))
@@ -76,5 +81,71 @@ describe GitHubChangelogGenerator::Generator do
       it { is_expected.to be_a Array }
       it { is_expected.to match_array(tags_mash_from_strings(%w(1 2))) }
     end
+
+    context "with invalid excluded tags" do
+      let(:generator) { GitHubChangelogGenerator::Generator.new(exclude_tags: %w(invalid tags)) }
+      it { is_expected.to be_a Array }
+      it { is_expected.to match_array(tags_mash_from_strings(%w(1 2 3))) }
+    end
+  end
+
+  describe "#get_time_of_tag" do
+    current_time = Time.now
+    before(:all) { @generator = GitHubChangelogGenerator::Generator.new }
+    context "run with nil parameter" do
+      it "should raise ChangelogGeneratorError" do
+        expect { @generator.get_time_of_tag nil }.to raise_error(GitHubChangelogGenerator::ChangelogGeneratorError)
+      end
+    end
+    context "fetch already filled tag" do
+      before { @generator.instance_variable_set :@tag_times_hash, "valid_tag" => current_time }
+      subject { @generator.get_time_of_tag tag_mash_with_name("valid_tag") }
+      it { is_expected.to be_a_kind_of(Time) }
+      it { is_expected.to eq(current_time) }
+    end
+    context "fetch not filled tag" do
+      before do
+        mock = double("fake fetcher")
+        allow(mock).to receive_messages(fetch_date_of_tag: current_time)
+        @generator.instance_variable_set :@fetcher, mock
+      end
+      subject do
+        of_tag = @generator.get_time_of_tag tag_mash_with_name("valid_tag")
+        of_tag
+      end
+      it { is_expected.to be_a_kind_of(Time) }
+      it { is_expected.to eq(current_time) }
+    end
+  end
+
+  describe "#sort_tags_by_date" do
+    time1 = Time.now
+    time2 = Time.now
+    time3 = Time.now
+    before(:all) do
+      @generator = GitHubChangelogGenerator::Generator.new
+    end
+    context "sort unsorted tags" do
+      tags = tags_mash_from_strings %w(valid_tag1 valid_tag2 valid_tag3)
+      before do
+        @generator.instance_variable_set :@tag_times_hash, "valid_tag1" => time1, "valid_tag2" => time2, "valid_tag3" => time3
+      end
+      subject do
+        @generator.sort_tags_by_date tags
+      end
+      it { is_expected.to be_a_kind_of(Array) }
+      it { is_expected.to match_array(tags.reverse!) }
+    end
+    context "sort sorted tags" do
+      tags = tags_mash_from_strings %w(valid_tag3 valid_tag2 valid_tag1)
+      before do
+        @generator.instance_variable_set :@tag_times_hash, "valid_tag1" => time1, "valid_tag2" => time2, "valid_tag3" => time3
+      end
+      subject do
+        @generator.sort_tags_by_date tags
+      end
+      it { is_expected.to be_a_kind_of(Array) }
+      it { is_expected.to match_array(tags) }
+    end
   end
 end
diff --git a/spec/unit/parser_spec.rb b/spec/unit/parser_spec.rb
index 6bc9d8a..3f792c1 100644
--- a/spec/unit/parser_spec.rb
+++ b/spec/unit/parser_spec.rb
@@ -1,21 +1,21 @@
 describe GitHubChangelogGenerator::Parser do
   describe ".user_project_from_remote" do
-    context "when remote is 1" do
+    context "when remote is type 1" do
       subject { GitHubChangelogGenerator::Parser.user_project_from_remote("origin  https://github.com/skywinder/ActionSheetPicker-3.0 (fetch)") }
       it { is_expected.to be_a(Array) }
       it { is_expected.to match_array(["skywinder", "ActionSheetPicker-3.0"]) }
     end
-    context "when remote is 2" do
+    context "when remote is type 2" do
       subject { GitHubChangelogGenerator::Parser.user_project_from_remote("https://github.com/skywinder/ActionSheetPicker-3.0") }
       it { is_expected.to be_a(Array) }
       it { is_expected.to match_array(["skywinder", "ActionSheetPicker-3.0"]) }
     end
-    context "when remote is 3" do
+    context "when remote is type 3" do
       subject { GitHubChangelogGenerator::Parser.user_project_from_remote("https://github.com/skywinder/ActionSheetPicker-3.0") }
       it { is_expected.to be_a(Array) }
       it { is_expected.to match_array(["skywinder", "ActionSheetPicker-3.0"]) }
     end
-    context "when remote is 4" do
+    context "when remote is type 4" do
       subject { GitHubChangelogGenerator::Parser.user_project_from_remote("origin git@github.com:skywinder/ActionSheetPicker-3.0.git (fetch)") }
       it { is_expected.to be_a(Array) }
       it { is_expected.to match_array(["skywinder", "ActionSheetPicker-3.0"]) }
@@ -27,9 +27,9 @@ describe GitHubChangelogGenerator::Parser do
     end
   end
   describe ".user_project_from_option" do
-    # context "when option is invalid" do
-    #   it("should exit") { expect { GitHubChangelogGenerator::Parser.user_project_from_option("blah", nil) }.to raise_error(SystemExit) }
-    # end
+    context "when option is invalid" do
+      it("should exit") { expect { GitHubChangelogGenerator::Parser.user_project_from_option("blah", nil) }.to raise_error(SystemExit) }
+    end
 
     context "when option is valid" do
       subject { GitHubChangelogGenerator::Parser.user_project_from_option("skywinder/ActionSheetPicker-3.0", nil) }