describe Imap::Backup::Configuration::ConnectionTester do
  describe ".test" do
    let(:connection) do
      instance_double(Imap::Backup::Account::Connection, client: nil)
    end

    before do
      allow(Imap::Backup::Account::Connection).to receive(:new) { connection }
    end

    describe "call" do
      it "tries to connect" do
        expect(connection).to receive(:client)

        subject.test("foo")
      end
    end

    describe "success" do
      it "returns success" do
        expect(subject.test("foo")).to match(/successful/)
      end
    end

    describe "failure" do
      before do
        allow(connection).to receive(:client).and_raise(error)
      end

      context "with no connection" do
        let(:error) do
          data = OpenStruct.new(text: "bar")
          response = OpenStruct.new(data: data)
          Net::IMAP::NoResponseError.new(response)
        end

        it "returns error" do
          expect(subject.test("foo")).to match(/no response/i)
        end
      end

      context "when caused by other errors" do
        let(:error) { "Error" }

        it "returns error" do
          expect(subject.test("foo")).to match(/unexpected error/i)
        end
      end
    end
  end
end