diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index c50680c8..ad2ea03a 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -40,3 +40,6 @@ jobs:
 
       - name: Run Build
         run: bundle exec rake default
+
+      - name: Test Gem
+        run: bundle exec rake test:gem
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e7e7963b..ae998e92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 
 # Change Log
 
+## 1.9.0
+
+See https://github.com/ruby-git/ruby-git/releases/tag/v1.9.0
+
 ## 1.8.1
 
 See https://github.com/ruby-git/ruby-git/releases/tag/v1.8.1
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 929b80b2..4f147fe0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -78,12 +78,14 @@ In order to ensure high quality, all pull requests must meet these requirements:
 
 ### Unit tests
   * All changes must be accompanied by new or modified unit tests
-  * The entire test suite must pass when `bundle exec rake test` is run from the
-    project's local working copy
-
-### Continuous Integration
-  * All tests must pass in the project's [Travis CI](https://travis-ci.org/ruby-git/ruby-git)
-    build before the pull request will be merged
+  * The entire test suite must pass when `bundle exec rake default` is run from the
+    project's local working copy.
+
+### Continuous integration
+  * All tests must pass in the project's [GitHub Continuous Integration build](https://github.com/ruby-git/ruby-git/actions?query=workflow%3ACI)
+    before the pull request will be merged.
+  * The [Continuous Integration workflow](https://github.com/ruby-git/ruby-git/blob/master/.github/workflows/continuous_integration.yml)
+    runs both `bundle exec rake default` and `bundle exec rake test:gem` from the project's [Rakefile](https://github.com/ruby-git/ruby-git/blob/master/Rakefile).
 
 ### Documentation
   * New and updated public methods must have [YARD](https://yardoc.org/)
diff --git a/README.md b/README.md
index 0ff9a0a5..bc651c34 100644
--- a/README.md
+++ b/README.md
@@ -146,6 +146,7 @@ g.revparse('v2.5:Makefile')
 
 g.branches # returns Git::Branch objects
 g.branches.local
+g.current_branch
 g.branches.remote
 g.branches[:master].gcommit
 g.branches['origin/master'].gcommit
diff --git a/Rakefile b/Rakefile
index cda2f8cf..acfa2bb0 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,4 +1,5 @@
 require 'bundler/gem_tasks'
+require 'English'
 
 require "#{File.expand_path(File.dirname(__FILE__))}/lib/git/version"
 
@@ -41,4 +42,15 @@ unless RUBY_PLATFORM == 'java'
   # default_tasks << :yardstick
 end
 
+default_tasks << :build
+
 task default: default_tasks
+
+desc 'Build and install the git gem and run a sanity check'
+task :'test:gem' => :install do
+  output = `ruby -e "require 'git'; g = Git.open('.'); puts g.log.size"`.chomp
+  raise 'Gem test failed' unless $CHILD_STATUS.success?
+  raise 'Expected gem test to return an integer' unless output =~ /^\d+$/
+
+  puts 'Gem Test Succeeded'
+end
diff --git a/lib/git/base.rb b/lib/git/base.rb
index fbca5f1b..6e7c7a10 100644
--- a/lib/git/base.rb
+++ b/lib/git/base.rb
@@ -137,13 +137,14 @@ def chdir # :yields: the Git::Path
 
     #g.config('user.name', 'Scott Chacon') # sets value
     #g.config('user.email', 'email@email.com')  # sets value
+    #g.config('user.email', 'email@email.com', file: 'path/to/custom/config)  # sets value in file
     #g.config('user.name')  # returns 'Scott Chacon'
     #g.config # returns whole config hash
-    def config(name = nil, value = nil)
-      if(name && value)
+    def config(name = nil, value = nil, options = {})
+      if name && value
         # set value
-        lib.config_set(name, value)
-      elsif (name)
+        lib.config_set(name, value, options)
+      elsif name
         # return value
         lib.config_get(name)
       else
@@ -387,7 +388,7 @@ def each_conflict(&block) # :yields: file, your_version, their_version
     #  @git.pull('upstream', 'develope')  # pulls from upstream/develop
     #
     def pull(remote='origin', branch='master')
-			self.lib.pull(remote, branch)
+      self.lib.pull(remote, branch)
     end
 
     # returns an array of Git:Remote objects
diff --git a/lib/git/lib.rb b/lib/git/lib.rb
index 191b8a74..8dcb4f8a 100644
--- a/lib/git/lib.rb
+++ b/lib/git/lib.rb
@@ -583,8 +583,12 @@ def show(objectish=nil, path=nil)
 
     ## WRITE COMMANDS ##
 
-    def config_set(name, value)
-      command('config', name, value)
+    def config_set(name, value, options = {})
+      if options[:file].to_s.empty?
+        command('config', name, value)
+      else
+        command('config', '--file', options[:file], name, value)
+      end
     end
 
     def global_config_set(name, value)
@@ -642,6 +646,7 @@ def remove(path = '.', opts = {})
     #  :date
     #  :no_verify
     #  :allow_empty_message
+    #  :gpg_sign
     #
     # @param [String] message the commit message to be used
     # @param [Hash] opts the commit options to be used
@@ -655,6 +660,7 @@ def commit(message, opts = {})
       arr_opts << "--date=#{opts[:date]}" if opts[:date].is_a? String
       arr_opts << '--no-verify' if opts[:no_verify]
       arr_opts << '--allow-empty-message' if opts[:allow_empty_message]
+      arr_opts << '--gpg-sign' if opts[:gpg_sign] == true || "--gpg-sign=#{opts[:gpg_sign]}" if opts[:gpg_sign]
 
       command('commit', arr_opts)
     end
diff --git a/lib/git/version.rb b/lib/git/version.rb
index 05b60fb1..6fe493dc 100644
--- a/lib/git/version.rb
+++ b/lib/git/version.rb
@@ -1,5 +1,5 @@
 module Git
   # The current gem version
   # @return [String] the current gem version.
-  VERSION='1.8.1'
+  VERSION='1.9.0'
 end
diff --git a/tests/units/test_config.rb b/tests/units/test_config.rb
index a1753831..c04c8530 100644
--- a/tests/units/test_config.rb
+++ b/tests/units/test_config.rb
@@ -1,6 +1,6 @@
 #!/usr/bin/env ruby
 
-require File.dirname(__FILE__) + '/../test_helper'
+require_relative '../test_helper'
 
 class TestConfig < Test::Unit::TestCase
   def setup
@@ -26,7 +26,20 @@ def test_set_config
       g.config('user.name', 'bully')
       assert_equal('bully', g.config('user.name'))
     end
-  end  
+  end
+
+  def test_set_config_with_custom_file
+    in_temp_dir do |_path|
+      custom_config_path = "#{Dir.pwd}/bare/.git/custom-config"
+      g = Git.clone(@wbare, 'bare')
+      assert_not_equal('bully', g.config('user.name'))
+      g.config('user.name', 'bully', file: custom_config_path)
+      assert_not_equal('bully', g.config('user.name'))
+      g.config('include.path', custom_config_path)
+      assert_equal('bully', g.config('user.name'))
+      assert_equal("[user]\n\tname = bully\n", File.read(custom_config_path))
+    end
+  end
 
   def test_env_config
     with_custom_env_variables do
diff --git a/tests/units/test_show.rb b/tests/units/test_show.rb
new file mode 100644
index 00000000..c44d81d4
--- /dev/null
+++ b/tests/units/test_show.rb
@@ -0,0 +1,20 @@
+#!/usr/bin/env ruby
+
+require File.dirname(__FILE__) + '/../test_helper'
+
+class TestShow < Test::Unit::TestCase
+  def test_do_not_chomp_contents
+    in_temp_dir do
+      file_name = 'README.md'
+      expected_contents = "hello\nworld\n\n"
+
+      g = Git.init
+      g.commit('Initial commit', allow_empty: true)
+      new_file(file_name, expected_contents)
+      g.add(file_name)
+      # Show the file from the index by prefixing the file namne with a colon
+      contents = g.show(":#{file_name}")
+      assert_equal(expected_contents, contents)
+    end
+  end
+end
diff --git a/tests/units/test_worktree.rb b/tests/units/test_worktree.rb
index 2b509726..f5141c8d 100644
--- a/tests/units/test_worktree.rb
+++ b/tests/units/test_worktree.rb
@@ -32,23 +32,24 @@ def create_temp_repo(clone_path)
 
   def setup
     @git = Git.open(git_working_dir)
-    
+
     @commit = @git.object('1cc8667014381')
     @tree = @git.object('1cc8667014381^{tree}')
     @blob = @git.object('v2.5:example.txt')
-    
+
     @worktrees = @git.worktrees
   end
-  
+
   def test_worktrees_all
     assert(@git.worktrees.is_a?(Git::Worktrees))
     assert(@git.worktrees.first.is_a?(Git::Worktree))
     assert_equal(@git.worktrees.size, 2)
   end
-  
+
   def test_worktrees_single
     worktree = @git.worktrees.first
-    assert_equal(worktree.dir, @git.dir.to_s)
+    git_dir = Pathname.new(@git.dir.to_s).realpath.to_s
+    assert_equal(worktree.dir, git_dir)
     assert_equal(worktree.gcommit, SAMPLE_LAST_COMMIT)
   end