<dependency>
  <groupId>io.grpc</groupId>
  <artifactId>grpc-testing-proto</artifactId>
  <version>1.21.0</version>
</dependency>

implementation 'io.grpc:grpc-testing-proto:1.21.0'

implementation("io.grpc:grpc-testing-proto:1.21.0")

libraryDependencies += "io.grpc" % "grpc-testing-proto" % "1.21.0"

@Grapes(
  @Grab(group='io.grpc', module='grpc-testing-proto', version='1.21.0')
)

<dependency org="io.grpc" name="grpc-testing-proto" rev="1.21.0" />

[io.grpc/grpc-testing-proto "1.21.0"]

'io.grpc:grpc-testing-proto:jar:1.21.0'