add test

spec/unit/parser_spec.rb

@@ -62,4 +62,19 @@ describe GitHubChangelogGenerator::Parser do
       it { is_expected.to match_array([nil, nil]) }
     end
   end
+  describe ".fetch_user_and_project" do
+    before :each do
+      ARGV = ["https://github.com/skywinder/github-changelog-generator"]
+    end
+    context do
+      let(:valid_user) { "initialized_user" }
+      let(:options) { { user: valid_user } }
+      let(:options_before_change) { options.dup }
+      it "should leave user unchanged" do
+        expect { GitHubChangelogGenerator::Parser.fetch_user_and_project(options) }.to change { options }
+          .from(options_before_change)
+          .to(options_before_change.merge(project: "github-changelog-generator"))
+      end
+    end
+  end
 end