Update Testing Guide

Testing-Guide.md

@@ -73,6 +73,10 @@ At this point, we have two choices:
 
 ## Development Servers
 
+**Note** it is important to read each service section linked in the list
+to get a fluent understanding of what each component offers us for
+testability.
+
 When a user runs `docker-compose up -d nginx`, a few things happen
 <small>(some services are omitted)</small>:
 
@@ -84,7 +88,6 @@ When a user runs `docker-compose up -d nginx`, a few things happen
 6. The [fastapi](#fastapi) service starts
 7. The [php-fpm](#php-fpm) service starts
 8. The [nginx](#nginx) service starts
-    - This last service depends on various other services.
 
 ###### Notes
 
@@ -96,6 +99,9 @@ currently; however, if you load up and rely on hot reload, you can
 do work and restart specific services if need be without concern
 (at least, until you add a dependency).
 
+* During checkouts to completely different branches, it is sometimes
+  necessary to restart the fastapi service: `docker-compose restart fastapi`.
+
 #### Certificate Authority
 
 The `ca` service will produce a `cache/ca.root.pem` file, which is used to
@@ -143,6 +149,11 @@ environment variable: `uvicorn` or `hypercorn`. It enables hot
 reloading of the server for changes in all directories in your tree,
 which automatically reflects on the [nginx](#nginx) service.
 
+###### Add Users
+
+You can create a user account in the database using the
+[util/adduser.py](https://gitlab.archlinux.org/archlinux/aurweb/-/tree/pu/util/adduser.py) script.
+
 This service is exposed on `localhost:18000`.
 
 #### php-fpm
@@ -186,10 +197,10 @@ its username (i.e. username: `kevin`, password: `kevin`).
 The `nginx` service will host two web servers (denoted below), both signed
 by the Root CA certificate `ca.root.pem`.
 
-| Backend | URL                    |
-|---------|------------------------|
-| PHP     | https://localhost:8443 |
-| FastAPI | https://localhost:8444 |
+| Backend             | URL                    |
+|---------------------|------------------------|
+| [php-fpm](#php-fpm) | https://localhost:8443 |
+| [fastapi](#fastapi) | https://localhost:8444 |
 
 ## User Experience