VALID_TOKEN = "0123456789abcdef".freeze
INVALID_TOKEN = "0000000000000000".freeze

DEFAULT_OPTIONS = { user: "skywinder",
                    project: "changelog_test" }.freeze

def options_with_invalid_token
  options = DEFAULT_OPTIONS
  options[:token] = INVALID_TOKEN
  options
end

describe GitHubChangelogGenerator::Fetcher do
  before(:all) do
    @fetcher = GitHubChangelogGenerator::Fetcher.new
  end

  describe "#fetch_github_token" do
    token = GitHubChangelogGenerator::Fetcher::CHANGELOG_GITHUB_TOKEN
    context "when token in ENV exist" do
      before { stub_const("ENV", ENV.to_hash.merge(token => VALID_TOKEN)) }
      subject { @fetcher.fetch_github_token }
      it { is_expected.to eq(VALID_TOKEN) }
    end
    context "when token in ENV is nil" do
      before { stub_const("ENV", ENV.to_hash.merge(token => nil)) }
      subject { @fetcher.fetch_github_token }
      it { is_expected.to be_nil }
    end
    context "when token in options and ENV is nil" do
      before do
        stub_const("ENV", ENV.to_hash.merge(token => nil))
        @fetcher = GitHubChangelogGenerator::Fetcher.new(token: VALID_TOKEN)
      end
      subject { @fetcher.fetch_github_token }
      it { is_expected.to eq(VALID_TOKEN) }
    end
    context "when token in options and ENV specified" do
      before do
        stub_const("ENV", ENV.to_hash.merge(token => "no_matter_what"))
        @fetcher = GitHubChangelogGenerator::Fetcher.new(token: VALID_TOKEN)
      end
      subject { @fetcher.fetch_github_token }
      it { is_expected.to eq(VALID_TOKEN) }
    end
  end

  describe "#github_fetch_tags" do
    context "when wrong token provided" do
      before do
        options = options_with_invalid_token
        @fetcher = GitHubChangelogGenerator::Fetcher.new(options)
      end
      it "should raise Unauthorized error" do
        expect { @fetcher.github_fetch_tags }.to raise_error Github::Error::Unauthorized
      end
    end
  end
end