classpath 'com.android.tools.build:gradle:4.1.0' // used in subproject
    }
}

tasks.register('encode') {
    doLast {
        def byte[] encodedString = new Base64().encode('hello world\n'.getBytes())
        println new String(encodedString)
    }
}
----

And you can apply the globally declared dependencies in the subproject that needs it:

[source,subproject/build.gradle]
----
plugins {

	for _, ce := range []string{"gzip", "GZIP"} {
		ce := ce
		t.Run(ce, func(t *testing.T) {
			const encodedString = "Hello Gopher"
			ts := newClientServerTest(t, mode, HandlerFunc(func(w ResponseWriter, r *Request) {
				w.Header().Set("Content-Encoding", ce)
				gz := gzip.NewWriter(w)
				gz.Write([]byte(encodedString))
				gz.Close()
			})).ts

			res, err := ts.Client().Get(ts.URL)
			if err != nil {