workshop-axon-testing

Example application for axon testing workshop

Domain/Context

The Holi-Bank is a very simple banking service.

The root aggregate is the BankAccountAggregate with identifier accountId and property: currentBalance.

Holi Bank does not believe in small coins, so all amount and balance are positive Integers.

We never lend money to anyone, so the min. balance of an account is 0. We also believe that no user should ever want nor need to own more than 1000 "money", so there is a hard max balance limit that should never be exceeded.

Use cases

Create Bank Account

• set accountId and initial balance

Rules:

• bank account must not exist by accountId

ATM Deposit Money

• increase the balance of the account by given amount

Rules:

• cmd must have positive amount
• the amount is added to the current balance
• the new current balance must not exceed 1000 or a MaxBalanceExceededException will be thrown.

ATM Withdraw Money

• decreases the balance of the account by given amount

Rules:

• cmd must have positive amount
• the amount is subtracted from the current balance
• the new current balance must not subceed 0 or an InsufficientBalanceException will be thrown.

Money transfer

• transfer an amount from one account to another

Rules:

• after the transfer ends successfully, the source account balance is decreased by the transferred amount
• after the transfer ends successfully, the target account balance is increased by the transferred amount
• the above min max rules apply for both accounts, so the transfer must not succeed when the target balance would exceed 1000 or the source balance would subceed 0
• the amount to be transferred is reserved for the source account, so while a transfer is in progress, the rules for withdrawal are applied to balance - transferAmount

Classes

The following branches are available for you to simplify the execution of classes:

• initial Working application without any tests.
• class/0-prepare Preparation for TDD-style fixture-based command model implementation.
• class/1-command-model Solution for command model tests, preparation for query model tests.
• class/2-query-model Solution for query model tests, preparation for Spring Integration tests.
• class/3-integration Solution for Spring integration tests, preparation for MockMVC REST E2E tests.
• class/4-rest-e2e Solution for MockMVC REST E2E tests.

Use the command git checkout <branch-name> to switch the branches. The branch represents the solution for the class. Check out the previous branch and work on the class. (For example, checkout class/0-prepare to execute the class 1 and then check the class/1-command-model to see the solution).