Make :no_gpg_sign its own option

Signed-off-by: Bradley Buda <bradleybuda@gmail.com>

lib/git/lib.rb

@@ -647,7 +647,8 @@ def remove(path = '.', opts = {})
     #  :date
     #  :no_verify
     #  :allow_empty_message
-    #  :gpg_sign (accepts true, false, or a gpg key ID as a String)
+    #  :gpg_sign (accepts true or a gpg key ID as a String)
+    #  :no_gpg_sign (conflicts with :gpg_sign)
     #
     # @param [String] message the commit message to be used
     # @param [Hash] opts the commit options to be used
@@ -661,15 +662,18 @@ 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]
-      if opts.has_key?(:gpg_sign)
+
+      if opts[:gpg_sign] && opts[:no_gpg_sign]
+        raise ArgumentError, 'cannot specify :gpg_sign and :no_gpg_sign'
+      elsif opts[:gpg_sign]
         arr_opts <<
           if opts[:gpg_sign] == true
             '--gpg-sign'
-          elsif opts[:gpg_sign] == false
-            '--no-gpg-sign'
           else
             "--gpg-sign=#{opts[:gpg_sign]}"
           end
+      elsif opts[:no_gpg_sign]
+        arr_opts << '--no-gpg-sign'
       end
 
       command('commit', arr_opts)

tests/units/test_commit_with_gpg.rb

@@ -44,8 +44,19 @@ def test_disabling_gpg_sign
         `true`
       end
       message = 'My commit message'
-      git.commit(message, gpg_sign: false)
+      git.commit(message, no_gpg_sign: true)
       assert_match(/commit.*--no-gpg-sign['"]/, actual_cmd)
     end
   end
+
+  def test_conflicting_gpg_sign_options
+    Dir.mktmpdir do |dir|
+      git = Git.init(dir)
+      message = 'My commit message'
+
+      assert_raises ArgumentError do
+        git.commit(message, gpg_sign: true, no_gpg_sign: true)
+      end
+    end
+  end
 end