Transaction model

Transaction.tk

package blog.guidobarbaglia.models

import java.time.LocalDateTime

data class Transaction(val creditCardNumber: String, val amount: Double, val timestamp: LocalDateTime)

TransactionTest.tk

package blog.guidobarbaglia.models

import org.junit.BeforeClass
import org.junit.Test
import java.time.LocalDateTime
import kotlin.test.assertEquals

class TransactionTest {
    companion object {
        @JvmStatic
        private lateinit var transaction: Transaction

        private const val creditCardNumber: String = "123123123"
        private const val amount: Double = 12.34
        private val timestamp: LocalDateTime = LocalDateTime.now()

        @BeforeClass
        @JvmStatic
        fun initialize() {
            transaction = Transaction(creditCardNumber = creditCardNumber, amount = amount, timestamp = timestamp)
        }
    }

    @Test
    fun `It sets the hashed credit card number`() {
        assertEquals(creditCardNumber, transaction.creditCardNumber)
    }

    @Test
    fun `It sets the amount of the transaction`() {
        assertEquals(amount, transaction.amount)
    }

    @Test
    fun `It sets the timestamp of the transaction`() {
        assertEquals(timestamp, transaction.timestamp)
    }
}