Hello all! Has anyone had luck mocking Exposed usi...

# announcements

[tKw]

Hello all! Has anyone had luck mocking Exposed using MockK?

[tKw]

I will attach some example code (similar to what we are trying to test).

[tKw]

import com.zaxxer.hikari.HikariConfig
import com.zaxxer.hikari.HikariDataSource
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.withContext
import org.jetbrains.exposed.dao.IntIdTable
import org.jetbrains.exposed.sql.Database
import org.jetbrains.exposed.sql.ResultRow
import org.jetbrains.exposed.sql.Transaction
import org.jetbrains.exposed.sql.selectAll
import org.jetbrains.exposed.sql.transactions.transaction
import kotlin.coroutines.CoroutineContext


class DatabaseConnection(config: HikariConfig) {
    private val dispatcher: CoroutineContext = Dispatchers.Default
    private val connection: Database = Database.connect(HikariDataSource(config))

    suspend fun <T> query(transaction: Transaction.() -> T) =
        withContext(dispatcher) {
            transaction(db = connection, statement = transaction)
        }
}

interface DatabaseConnectionProvider {
    suspend fun <T> query(transaction: (Transaction.() -> T)): T
}

object DatabaseTest : DatabaseConnectionProvider {
    val config = HikariConfig().apply {
        driverClassName = "org.postgresql.Driver"
        jdbcUrl = "jdbc:<postgresql://localhost:5432/exposed>"
        username = "exposed"
        password = "exposed"
        maximumPoolSize = 3
        isAutoCommit = false
        transactionIsolation = "TRANSACTION_REPEATABLE_READ"
    }

    private val connection: DatabaseConnection = DatabaseConnection(config)

    override suspend fun <T> query(transaction: (Transaction.() -> T)) = connection.query(transaction)
}

object Peeps : IntIdTable("peeps") {
    data class Peep(val name: String, val role: String)

    val name = text("name")
    val role = text("role")

    fun toPeep(row: ResultRow): Peep = Peep(
        row[Peeps.name],
        row[Peeps.role]
    )
}

suspend fun main() {
    DatabaseTest.query {
        Peeps.selectAll().orderBy(Peeps.id).map { Peeps.toPeep(it) }.forEach { println("${it.name} - ${it.role}") }
    }
}

[tKw]

Below is what we have so far for testing.

[tKw]

import io.kotlintest.specs.DescribeSpec
import io.mockk.*
import kotlinx.coroutines.runBlocking
import org.jetbrains.exposed.sql.Transaction
import org.jetbrains.exposed.sql.selectAll
import org.jetbrains.exposed.sql.statements.InsertSelectStatement

class MainTests: DescribeSpec({
    describe("test migrateDatabase") {
        it("") {
            coEvery {
                DatabaseTest.query(any<Transaction.() -> Unit>())
            } returns mockk()

            runBlocking {
                DatabaseTest.query {
                    Peeps.selectAll().map { Peeps.toPeep(it) }.forEach { println(it.name) }
                }
            }

            coVerify {
                DatabaseTest.query { any<InsertSelectStatement>() }
            }
        }
    }
})

[Czar]

"Edit message" button + triple backticks 🙂

[tKw]

I think I need more coffee.

[MrNiamh]

#C9EJFT6DB may have some answers too