Fixed test for magnet pattern

Author: yadavan88

build.sbt

@@ -472,8 +472,9 @@ lazy val scala_strings = (project in file("scala-strings"))
 lazy val scala_design_patterns = (project in file("scala-design-patterns"))
   .settings(
     name := "scala-design-patterns",
+    scalaVersion := scala3Version,
     libraryDependencies ++= scalaTestDeps,
-    libraryDependencies += scalaMock,
+    libraryDependencies += "org.scalatestplus" %% "mockito-3-4" % "3.2.10.0" % Test,
     libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test
   )
 

scala-design-patterns/src/main/scala-2/com/baeldung/scala/cakepattern/CakePattern.scala renamed to scala-design-patterns/src/main/scala/com/baeldung/scala/cakepattern/CakePattern.scala

@@ -1,5 +1,7 @@
 package com.baeldung.scala.magnetpattern
 
+import scala.language.implicitConversions
+
 object MagnetPattern extends App {
 
   /*
@@ -20,11 +22,11 @@ object MagnetPattern extends App {
 
   def combineElements(magnet: CombineMagnet): magnet.Result = magnet()
 
-  implicit def intCombineMagnet(intList: List[Int]) = new CombineMagnet {
+  implicit def intCombineMagnet(intList: List[Int]): CombineMagnet {type Result = Int} = new CombineMagnet {
     override type Result = Int
     override def apply(): Result = intList.reduce((i, c) => i + c)
   }
-  implicit def strCombineMagnet(stringList: List[String]) = new CombineMagnet {
+  implicit def strCombineMagnet(stringList: List[String]): CombineMagnet {type Result = String} = new CombineMagnet {
     override type Result = String
     override def apply(): Result = stringList.reduce((s, c) => s.concat(c))
   }

scala-design-patterns/src/main/scala-2/com/baeldung/scala/magnetpattern/MagnetPattern.scala renamed to scala-design-patterns/src/main/scala/com/baeldung/scala/magnetpattern/MagnetPattern.scala

@@ -1,21 +1,22 @@
 package com.baeldung.scala.cakepattern
 
 import com.baeldung.scala.cakepattern.CakePattern.Test
-import org.scalamock.scalatest.MockFactory
+import org.mockito.Mockito.when
 import org.scalatest.flatspec.AnyFlatSpec
+import org.scalatestplus.mockito.MockitoSugar
 
 trait TestRegistry
   extends CakePattern.TestExecutorComponent
   with CakePattern.TestEnvironmentComponent
-  with MockFactory {
+  with MockitoSugar {
   override val env: TestEnvironment = mock[TestEnvironment]
   override val testExecutor: TestExecutor = new TestExecutor
 }
 
 class CakePatternUnitTest extends AnyFlatSpec with TestRegistry {
 
   "A TestExecutor" should "execute tests using a given environment" in {
-    (env.readEnvironmentProperties _).expects().returning(Map("ENV" -> "true"))
+    when(env.readEnvironmentProperties).thenReturn(Map("ENV" -> "true"))
     val test = Test(
       "test-1",
       { environment =>