This repository contains examples of Contract Tests in various programming languages.

This example is loosely based on the TradeOrderRepository found in the "Domain-Driven Design: Tackling Complexity in the Heart of Software" book by Eric Evans.

Implement the TradeOrderRepository with a database storage. The repository should have two methods:

• forTrackingId(String): TradeOrder - takes the tracking ID and returns a TradeOrder.

• outstandingForBrokerageAccountId(String): List<TradeOrder> - takes the brokerage account ID and returns a list of TradeOrders

The expected behaviour of TradeOrderRepository methods:

• forTrackingId
  • returns the TradeOrder if it exists for the given tracking ID
  • returns null if the TradeOrder is not found for the given tracking ID (alternatively, expect an exception)
• outstandingForBrokerageAccountId
  • returns all outstanding TradeOrders for the given account ID
  • returns an empty list if no TradeOrder was found for the given account ID

• Kotlin | Steps: Domain Model > Integration microtest > Extract SUT and fixture creation > Contract placeholder > Pull test methods up to the contract test > Second adapter
• Kotlin (composition) | Steps: Domain Model > Integration microtest > Extract SUT and fixture creation > Contract Test > Move the Contract Test > Second adapter