Patches in scalatest

Question

I'm new to scala and same for scalatest.

My aim is to write a Unit test for the following small piece of code:

import java.sql.SQLException

import com.typesafe.scalalogging.LazyLogging
import slick.jdbc.MySQLProfile.api._

import scala.concurrent.{ExecutionContext, ExecutionContextExecutor, Future}

object DbCreator extends LazyLogging {
  implicit val ex: ExecutionContextExecutor = ExecutionContext.global

  def createDatabaseIfNotExist(): Future[String] = {
    Database
      .forURL(url = "some host", user = "user", password = "pass", driver = "driver")
      .run(sqlu"CREATE DATABASE ...").map(_ => "created")
      .recover {
        case e: Throwable => {
          logger.error("Error!", e)
          throw new SQLException(e.getMessage)
        }
      }
  }
}

I've previously used python, which has the patch concept .

So my idea was to patch the Database class being imported and used in createDatabaseIfNotExist , so I can verify the different scenarios.

Unfortunately, I could not find equivalent/similar concept in scalatest.

Did I miss it?

Is my approach wrong? If so, how would u suggest me write a UT for the createDatabaseIfNotExist method?

Is the current DbCreator implementation not testable enough?

Many thanks for all help!

Answer 1

I see several options:

• scalamock or some java mocking library
• acolyte JDBC driver (has scala DSL)
• embedded mysql