diff --git a/docs/src/docs/asciidoc/testing.adoc b/docs/src/docs/asciidoc/testing.adoc
index 4502194a..7e3ae996 100644
--- a/docs/src/docs/asciidoc/testing.adoc
+++ b/docs/src/docs/asciidoc/testing.adoc
@@ -4,13 +4,19 @@ To write unit tests with MongoDB and Spock you can simply extend from `grails.te
 uses by default a `MongoClient` instance that connects to a MongoDB instance as defined in your configuration
 (by default, `localhost` and port `27017`, see <<gettingStarted>> for more details):
 
+It is preferable to use testcontainers to automatically run MongoDB in a containerized environment and not have to run a MongoDB instance locally. The following examples use testcontainers:
+
+[source,groovy]
+----
+include::{sourcedir}/examples/grails3-mongodb/src/test/groovy/functional/tests/EmbeddedMongoClient.groovy[]
+----
+
 [source,groovy]
 ----
 include::{sourcedir}/examples/grails3-mongodb/src/test/groovy/functional/tests/LocalMongoUnitSpec.groovy[tags=structure]
 ----
 
-You can also provide your own `MongoClient` instance to use something such as https://github.com/fakemongo/fongo[Fongo],
-as shown in the following example:
+You can also use your own low-level `MongoClient` instance, as shown in the following example:
 
 [source,groovy]
 ----