[E2E] Tests: Bridge/relayer (deposit + withdrawal)

[sadiq1971]

Context

Second batch of E2E tests covering the bridge/relayer: PROMPT token deposits from Ethereum to Canton, withdrawals from Canton back to Ethereum, and edge cases.

Files to Create

All in tests/e2e/tests/bridge/, all with //go:build e2e.

main_test.go

//go:build e2e

package bridge_test

import (
    "os"
    "testing"

    "github.com/chainsafe/canton-middleware/tests/e2e/devstack/presets"
)

func TestMain(m *testing.M) {
    os.Exit(presets.DoMain(m))
}

deposit_test.go

Test	Scenario
TestDeposit_PROMPT_EthereumToCanton	Register User1; DSL.Deposit 100 PROMPT; DSL.WaitForCantonBalance(User1, "PROMPT", "100")
TestDeposit_TwoUsers_Independent	Register User1 + User2; deposit different amounts; assert each has correct independent balance
TestDeposit_SmallAmount	Deposit 1 wei (smallest unit); verify non-zero Canton balance appears

withdrawal_test.go

Test	Scenario
TestWithdrawal_PROMPT_CantonToEthereum	Deposit then withdraw; WaitForCantonBalance(0); verify Ethereum PROMPT balance restored
TestWithdrawal_PartialAmount	Deposit 100, withdraw 40; verify Canton balance = 60, Ethereum balance increased by 40
TestWithdrawal_AfterTransfer	Deposit to User1, transfer 50 to User2 (via api-server), User2 withdraws 50

Makefile update

test-e2e-bridge:
	go test -v -tags e2e -timeout 15m ./tests/e2e/tests/bridge/...

Acceptance Criteria

• make test-e2e-bridge passes green against a running full stack.
• WaitForCantonBalance uses 30s timeout; withdrawal Ethereum balance checks use Anvil.ERC20Balance directly.
• Tests are idempotent when run against a fresh stack (no shared mutable state between tests).

Dependencies

• Issue [E2E] Devstack: Layers 4/5/6 (System + DSL + Presets) #181 ([E2E] Devstack: Layers 4/5/6) — presets.DoMain, presets.NewFullStack, sys.DSL.*.

Size

M (1 day)

[sadiq1971]

Depends on: #181