Improve testing doc

TESTING.md

@@ -1,33 +1,40 @@
 # Testing
 
-Tested using chef-workstation from Homebrew
+## Unit testing and liting
 
-# Lint and Style
+Tested using chef-workstation devcontainer.
+
+In the case you are not using the devcontainer you will probably need to install the dependencies before running the tests:
 
 ```sh
-CHEF_LICENSE=accept-no-persist delivery local lint
+berks install --except integration
 ```
 
-# Unit specs
+### Lint and Style
 
+```sh
+CHEF_LICENSE=accept-no-persist delivery local lint
 ```
-berks install --except integration
+
+### Unit specs
+
+```sh
 CHEF_LICENSE=accept-no-persist delivery local unit
 ```
 
-# Integration tests
+## Integration tests
 
 Check [Test Kitchen](https://kitchen.ci/docs/getting-started/running-test). Consider using the `--concurrency` flag when possible.
 
-## kitchen-vagrant
+### kitchen-vagrant
 
 Tested locally with macOS Monterrey 12.1, VirtualBox 6.1.30, and Vagrant 2.2.19.
 
 ```sh
 kitchen test
 ```
 
-## kitchen-dokken
+### kitchen-dokken
 
 Tested locally with macOS Monterrey 12.1, and Docker Desktop 4.3.1.
 Tested remotely with Github Actions.