<dependency>
  <groupId>org.specs2</groupId>
  <artifactId>specs2-mock_2.12.0-M4</artifactId>
  <version>3.8.3</version>
</dependency>

implementation 'org.specs2:specs2-mock_2.12.0-M4:3.8.3'

implementation("org.specs2:specs2-mock_2.12.0-M4:3.8.3")

libraryDependencies += "org.specs2" % "specs2-mock_2.12.0-M4" % "3.8.3"

@Grapes(
  @Grab(group='org.specs2', module='specs2-mock_2.12.0-M4', version='3.8.3')
)

<dependency org="org.specs2" name="specs2-mock_2.12.0-M4" rev="3.8.3" />

[org.specs2/specs2-mock_2.12.0-M4 "3.8.3"]

'org.specs2:specs2-mock_2.12.0-M4:jar:3.8.3'