Scala 2.11.12+Play框架下Mockito依赖配置问题求助

Hey there! Let's get to the bottom of why your Mockito imports aren't working and fix that compilation error once and for all.

The Root Cause #

Your main problem is an extremely outdated Mockito dependency version (v0.30 is from 2009—way too old for Scala 2.11 and your Play setup!) and a missing compatibility layer between ScalaTest and Mockito (since you're using MockitoSugar).

Step 1: Replace the Broken Mockito Dependency #

In your build.sbt, you've got this line that's causing the core issue:

libraryDependencies += "org.mockito" % "mockito-core" % "0.30" % "test"

Replace it with a stable, compatible Mockito Core version that works with Scala 2.11 (this was the latest stable release around 2019 when you posted):

libraryDependencies += "org.mockito" % "mockito-core" % "2.28.2" % Test

Step 2: Add ScalaTest-Mockito Compatibility (Recommended) #

Since you're using org.scalatest.mockito.MockitoSugar in your tests, adding this dedicated compatibility dependency will eliminate any version conflicts between ScalaTest and Mockito:

libraryDependencies += "org.scalatestplus" %% "mockito-2-10" % "3.1.0.0" % Test

This version is built to work perfectly with your existing scalatestplus-play 3.1.2 and Scala 2.11 setup.

Step 3: Clean and Rebuild Your Project #

Old compilation caches can cause weird issues even after fixing dependencies. Run these commands to refresh everything:

sbt clean test:compile test

• clean wipes old cached files
• test:compile ensures test dependencies are properly resolved
• test runs your test suite to confirm the fix

Step 4: Tweak Your Test Code (Optional but Best Practice) #

Quick note: Using thenReturn(null) isn't idiomatic Scala. If your getEmployeestructure method returns an Option (which it probably should), replace that line with:

when(mockedEmployeeDAO.getEmployeestructure(6)).thenReturn(None)

This aligns with Scala's null-safe practices.

Final Test Dependencies Section for build.sbt #

Here's how your test-related dependencies should look after all changes:

libraryDependencies += "org.scalatestplus.play" %% "scalatestplus-play" % "3.1.2" % Test
libraryDependencies += "org.scalatest" %% "scalatest" % "3.0.8" % Test
libraryDependencies += "com.novocode" % "junit-interface" % "0.11" % Test
libraryDependencies += "org.mockito" % "mockito-core" % "2.28.2" % Test
libraryDependencies += "org.scalatestplus" %% "mockito-2-10" % "3.1.0.0" % Test

内容的提问来源于stack exchange，提问作者Indu Chabada