I test payment systems for a living. I build apps for businesses on the side.

1package bank.tests.steps2 3import io.cucumber.java.en.Given4import io.cucumber.java.en.Then5import io.cucumber.java.en.When6import org.assertj.core.api.Assertions.assertThat7import java.math.BigDecimal8 9class PaymentSteps(10    private val accounts: TestAccounts,   // test-data API11    private val gateway: PaymentGateway,  // ISO 20022 endpoint12    private val clearing: ClearingSim,    // clearing system simulator13) {14    private lateinit var debtor: String15    private lateinit var pacs008: Pacs00816 17    @Given("the debtor account {string} has {bigdecimal} EUR")18    fun debtorHas(iban: String, balance: BigDecimal) {19        debtor = iban.replace(" ", "")20        accounts.ensureBalance(debtor, balance, "EUR")21    }22 23    @When("the bank sends a pacs.008 credit transfer of {bigdecimal} EUR to {string}")24    fun sendCreditTransfer(amount: BigDecimal, creditor: String) {25        val mt103 = Mt103.creditTransfer(debtor, creditor.replace(" ", ""), amount)26        pacs008 = MtToMx.convert(mt103)   // MT103 -> pacs.008.001.0827        assertThat(pacs008.settlementAmount).isEqualByComparingTo(amount)28        gateway.send(pacs008)29    }30 31    @Then("the message is valid against the pacs.008 schema")32    fun messageIsValid() {33        assertThat(Xsd.PACS_008.validate(pacs008.xml)).isEmpty()34    }35 36    @Then("the clearing system replies with pacs.002 status {string}")37    fun clearingReplies(status: String) {38        val pacs002 = clearing.awaitStatusReport(pacs008.endToEndId)39        assertThat(pacs002.txStatus).isEqualTo(status)40    }41 42    @Then("the debtor account has {bigdecimal} EUR")43    fun debtorBalance(expected: BigDecimal) {44        assertThat(accounts.balance(debtor)).isEqualByComparingTo(expected)45    }46}