Contents

require 'spec_helper'

RSpec.describe CurrencyRate::CryptoAdapter do

  class CurrencyRate::Adapter
    FETCH_URL            = ''
    DEFAULT_CURRENCIES   = { from: "BTC", to: "USD" }
  end

  class SomeExchangeAdapter < CurrencyRate::CryptoAdapter
    SUPPORTED_CRYPTO_CURRENCIES = ["BTC"]

    def rate_for(from,to)
      super
      rate = rate_to_f(750)
      invert_rate(from,to,rate)
    end

    def supported_currency_pairs
      ["USD/BTC"]
    end
  end

  before(:each) do
    @exchange_adapter = CurrencyRate::CryptoAdapter.instance
  end

  it "inverts currency rate when needed" do
    allow(SomeExchangeAdapter.instance).to receive(:fetch_rates!)
    @exchange_adapter = SomeExchangeAdapter.instance
    expect(@exchange_adapter.rate_for('USD', 'BTC')).to eq(0.001333333)
  end


  it "when checking for rates, only calls fetch_rates! if they were checked long time ago or never" do
    uri_mock = double('uri mock')
    expect(URI).to      receive(:parse).and_return(uri_mock).once
    expect(uri_mock).to receive(:read).and_return('{ "USD": 534.4343 }').once
    allow(@exchange_adapter).to receive(:supported_currency_pairs).and_return(["USD/BTC"])
    @exchange_adapter.rate_for('USD', 'BTC')
    @exchange_adapter.rate_for('USD', 'BTC') # not calling fetch_rates! because we've just checked
    @exchange_adapter.instance_variable_set(:@rates_updated_at, Time.now-1900)
    @exchange_adapter.rate_for('USD', 'BTC')
  end

  it "raises exception if rate is nil" do
    rate = nil
    expect( -> { @exchange_adapter.rate_to_f(rate) }).to raise_error(CurrencyRate::Adapter::CurrencyNotSupported)
  end

  it "raises exception if target currency is not in supported currencies" do
    @exchange_adapter = SomeExchangeAdapter.instance
    expect( -> { @exchange_adapter.rate_for("BTC", "CNY") }).to raise_error(CurrencyRate::Adapter::CurrencyNotSupported)
  end

end

Version data entries

3 entries across 3 versions & 1 rubygems

Version	Path
currency-rate-0.4.1	spec/lib/crypto_adapter_spec.rb
currency-rate-0.4.0	spec/lib/crypto_adapter_spec.rb
currency-rate-0.3.9	spec/lib/crypto_adapter_spec.rb