Using scalamock outside of MockFactory - scala

Question

I want to add integration tests to my project using cucumber feature files. I have got this working using this project as an example: https://github.com/jecklgamis/cucumber-jvm-scala-example
The problem I am running into is when I want to mock some objects. ScalaMock and EasyMock all seem to need scalatest or something similar.
My build.sbt has these lines:
libraryDependencies ++= Seq(
"io.cucumber" %% "cucumber-scala" % "2.0.1" % Test,
"io.cucumber" % "cucumber-junit" % "2.0.1" % Test,
"org.scalamock" %% "scalamock" % "4.0.0" % Test,
"org.scalatest" %% "scalatest" % "3.0.1" % Test,
etc..
My stepdef file has this:
import com.typesafe.config.{Config, ConfigFactory}
import cucumber.api.scala.{EN, ScalaDsl}
import eu.xeli.jpigpio.JPigpio
class StepDefs extends ScalaDsl with EN {
var config: Config = null
var jpigpio: JPigpio = null
Given("""^an instance of pigpio$""") { () =>
jpigpio = mock[JPigpio]
}
}
The mock[JPigpio] call gives a symbol not found error. I assume because this class does not extend MockFactory.
How can I use scalamock outside of an MockFactory class?

Answer 1

Bit of a quick and dirty example that does not pull in Scalatest, but I'm sure you can piece the rest together. I'd actually be curious to see this working with Cucumber :)
import org.scalamock.MockFactoryBase
import org.scalamock.clazz.Mock
object NoScalaTestExample extends Mock {
trait Cat {
def meow(): Unit
def isHungry: Boolean
}
class MyMockFactoryBase extends MockFactoryBase {
override type ExpectationException = Exception
override protected def newExpectationException(message: String, methodName: Option[Symbol]): Exception =
throw new Exception(s"$message, $methodName")
def verifyAll(): Unit = withExpectations(() => ())
}
implicit var mc: MyMockFactoryBase = _
var cat: Cat = _
def main(args: Array[String]): Unit = {
// given: I have a mock context
mc = new MyMockFactoryBase
// and am mocking a cat
cat = mc.mock[Cat]
// and the cat meows
cat.meow _ expects() once()
// and the cat is always hungry
cat.isHungry _ expects() returning true anyNumberOfTimes()
// then the cat needs feeding
assert(cat.isHungry)
// and the mock verifies
mc.verifyAll()
}
}
This will actually throw as the meows expectation is not satisfied (just to demo)
Exception in thread "main" java.lang.Exception: Unsatisfied expectation:
Expected:
inAnyOrder {
<mock-1> Cat.meow() once (never called - UNSATISFIED)
<mock-1> Cat.isHungry() any number of times (called once)
}
Actual:
<mock-1> Cat.isHungry(), None
at NoScalaTestExample$MyMockFactoryBase.newExpectationException(NoScalaTestExample.scala:13)
at NoScalaTestExample$MyMockFactoryBase.newExpectationException(NoScalaTestExample.scala:10)
at org.scalamock.context.MockContext$class.reportUnsatisfiedExpectation(MockContext.scala:45)
at NoScalaTestExample$MyMockFactoryBase.reportUnsatisfiedExpectation(NoScalaTestExample.scala:10)