Spec: option name translation tested

spec/files/github_changelog_params_327

@@ -1 +1,2 @@
 exclude-labels=73a91042-da6f-11e5-9335-1040f38d7f90,7adf83b4-da6f-11e5-ae18-1040f38d7f90
+header_label=# My changelog

spec/unit/parse_file_spec.rb

@@ -43,11 +43,18 @@ describe GitHubChangelogGenerator::ParserFile do
             params_file: "spec/files/github_changelog_params_327"
           }
         end
+
         it "reads exclude_labels into an Array" do
           expect { parse.parse! }.to change { options[:exclude_labels] }
             .from(nil)
             .to(["73a91042-da6f-11e5-9335-1040f38d7f90", "7adf83b4-da6f-11e5-ae18-1040f38d7f90"])
         end
+
+        it "translates given header_label into the :header option" do
+          expect { parse.parse! }.to change { options[:header] }
+            .from(nil)
+            .to("# My changelog")
+        end
       end
     end
   end