<dependency>
  <groupId>org.log4s</groupId>
  <artifactId>log4s-testing_2.12</artifactId>
  <version>1.8.2</version>
</dependency>

implementation 'org.log4s:log4s-testing_2.12:1.8.2'

implementation("org.log4s:log4s-testing_2.12:1.8.2")

libraryDependencies += "org.log4s" % "log4s-testing_2.12" % "1.8.2"

@Grapes(
  @Grab(group='org.log4s', module='log4s-testing_2.12', version='1.8.2')
)

<dependency org="org.log4s" name="log4s-testing_2.12" rev="1.8.2" />

[org.log4s/log4s-testing_2.12 "1.8.2"]

'org.log4s:log4s-testing_2.12:jar:1.8.2'