Rest Mock

This sample shows, how a service which depends on an external API can be tested in isolation by mocking the remote server.

• The RestExchangeService converts from one currency to another.
• Exchange rates are retrieved from https://exchangeratesapi.io/ using a RestTemplate.
• The ExchangeController provides the conversion as REST API.
• The RestExchangeServiceTest mocks the REST API used to get the exchange rates.