/be_exercises

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OneWallet BE Exercises

Before you proceed with the exercise, this assumes that you have already read/knowledgeable when it comes to the event sourcing.

Events

Events that will be used for all the tests can be found on the ./event.ts.

Each event has the following properties:

  • aggregateType: This describes as to what kind of entity it refers to, whether an Account, Deposit, Withdrawal, etc..

  • aggregateId: The id of the entity that it refers.

  • version: The version of the event given the aggregateType and aggregateId took place the moment this event was created. Each mutation on the entity has the version + 1 of the previous version.

  • type: This defines as to what type of event took place, like AccountCreated, AccountUpdated, etc..

  • body: It describes as to what properties has been changed/added that was meant by the type. ie:

    • When type is AccountCreated with body: { username: 'johndoe' }, it means that there is an account that was created with a username johndoe.

Clone this repository into a personal private repository in Github and add @djansyle as collaborator of the repository. Implement all functions/method that has a TODO. Aim to pass all the test scenarios.

Environment:

OS: Linux

Node: v12.18.2

NPM: 6.14.5

Exercises

Implement the following methods/functions and make the npm test pass without modifying the test files.

./#1/src/index.ts

  • calculateAccountBalance
  • getAccountInformation

./#2/src/aggregate/account.ts

  • apply

./#2/src/projection/account.ts

  • apply