diff --git a/.gitignore b/.gitignore
index 1a64e05d3c..8a63988681 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,3 +62,7 @@ lib/
 output
 
 serverless-expansion.yml
+serverless.env
+
+lb-expansion.yml
+lb.env
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 481686bc66..c604141321 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -54,6 +54,7 @@ If you just want to get formatting and linting working automatically use these s
 - Start a mongod standalone with our [cluster_setup.sh](test/tools/cluster_setup.sh) script
   - Usage: `./test/tools/cluster_setup.sh server`
 - Run the tests with `npm test`
+- Read further in [test/readme.md](test/readme.md) if you need to test a special environment like CSFLE, or Serverless.
 
 ### Tests FAQ
 
diff --git a/README.md b/README.md
index ebcde5d233..3cc1e60c5b 100644
--- a/README.md
+++ b/README.md
@@ -2,19 +2,20 @@
 
 The official [MongoDB](https://www.mongodb.com/) driver for Node.js.
 
-**Upgrading to version 4? Take a look at our [upgrade guide here](https://github.com/mongodb/node-mongodb-native/blob/4.1/docs/CHANGES_4.0.0.md)!**
+**Upgrading to version 4? Take a look at our [upgrade guide here](https://github.com/mongodb/node-mongodb-native/blob/HEAD/docs/CHANGES_4.0.0.md)!**
 
 ## Quick Links
 
-| what          | where                                                                                                  |
-| ------------- | ------------------------------------------------------------------------------------------------------ |
-| documentation | [docs.mongodb.com/drivers/node](https://docs.mongodb.com/drivers/node)                                 |
-| api-doc       | [mongodb.github.io/node-mongodb-native/4.1/](https://mongodb.github.io/node-mongodb-native/4.1/)       |
-| npm package   | [www.npmjs.com/package/mongodb](https://www.npmjs.com/package/mongodb)                                 |
-| source        | [github.com/mongodb/node-mongodb-native](https://github.com/mongodb/node-mongodb-native)               |
-| mongodb       | [www.mongodb.com](https://www.mongodb.com)                                                             |
-| changelog     | [HISTORY.md](https://github.com/mongodb/node-mongodb-native/blob/4.1/HISTORY.md)                       |
-| upgrade to v4 | [docs/CHANGES_4.0.0.md](https://github.com/mongodb/node-mongodb-native/blob/4.1/docs/CHANGES_4.0.0.md) |
+| what          | where                                                                                                   |
+| ------------- | ------------------------------------------------------------------------------------------------------- |
+| documentation | [docs.mongodb.com/drivers/node](https://docs.mongodb.com/drivers/node)                                  |
+| api-doc       | [mongodb.github.io/node-mongodb-native/4.1/](https://mongodb.github.io/node-mongodb-native/4.1/)        |
+| npm package   | [www.npmjs.com/package/mongodb](https://www.npmjs.com/package/mongodb)                                  |
+| source        | [github.com/mongodb/node-mongodb-native](https://github.com/mongodb/node-mongodb-native)                |
+| mongodb       | [www.mongodb.com](https://www.mongodb.com)                                                              |
+| changelog     | [HISTORY.md](https://github.com/mongodb/node-mongodb-native/blob/HEAD/HISTORY.md)                       |
+| upgrade to v4 | [docs/CHANGES_4.0.0.md](https://github.com/mongodb/node-mongodb-native/blob/HEAD/docs/CHANGES_4.0.0.md) |
+| contributing  | [CONTRIBUTING.md](https://github.com/mongodb/node-mongodb-native/blob/HEAD/CONTRIBUTING.md)             |
 
 ### Bugs / Feature Requests
 
@@ -34,7 +35,7 @@ For issues with, questions about, or feedback for the Node.js driver, please loo
 
 ### Change Log
 
-Change history can be found in [`HISTORY.md`](https://github.com/mongodb/node-mongodb-native/blob/4.1/HISTORY.md).
+Change history can be found in [`HISTORY.md`](https://github.com/mongodb/node-mongodb-native/blob/HEAD/HISTORY.md).
 
 ### Compatibility
 
@@ -78,7 +79,7 @@ The MongoDB driver depends on several other packages. These are:
 - [kerberos](https://github.com/mongodb-js/kerberos)
 - [mongodb-client-encryption](https://github.com/mongodb/libmongocrypt#readme)
 
-Some of these packages include native C++ extensions, consult the [trouble shooting guide here](https://github.com/mongodb/node-mongodb-native/blob/4.1/docs/native-extensions.md) if you run into issues.
+Some of these packages include native C++ extensions. Consult the [trouble shooting guide here](https://github.com/mongodb/node-mongodb-native/blob/HEAD/docs/native-extensions.md) if you run into issues.
 
 ## Quick Start
 
@@ -239,7 +240,7 @@ For more detailed information, see the [indexing strategies page](https://docs.m
 
 ## Error Handling
 
-If you need to filter certain errors from our driver we have a helpful tree of errors described in [docs/errors.md](https://github.com/mongodb/node-mongodb-native/blob/4.1/docs/errors.md).
+If you need to filter certain errors from our driver we have a helpful tree of errors described in [docs/errors.md](https://github.com/mongodb/node-mongodb-native/blob/HEAD/docs/errors.md).
 
 It is our recommendation to use `instanceof` checks on errors and to avoid relying on parsing `error.message` and `error.name` strings in your code.
 We guarantee `instanceof` checks will pass according to semver guidelines, but errors may be sub-classed or their messages may change at any time, even patch releases, as we see fit to increase the helpfulness of the errors.
@@ -275,4 +276,4 @@ try {
 [Apache 2.0](LICENSE.md)
 
 © 2009-2012 Christian Amor Kvalheim
-© 2012-present MongoDB [Contributors](https://github.com/mongodb/node-mongodb-native/blob/4.1/CONTRIBUTORS.md)
+© 2012-present MongoDB [Contributors](https://github.com/mongodb/node-mongodb-native/blob/HEAD/CONTRIBUTORS.md)
diff --git a/test/readme.md b/test/readme.md
new file mode 100644
index 0000000000..c85aa13f4c
--- /dev/null
+++ b/test/readme.md
@@ -0,0 +1,118 @@
+# How to test
+
+## Special Environments
+
+There are collections of tests that test features requiring a specialized set of environment variables to be generated and set in order to run. Look below for the section that applies to the feature you are trying to test.
+
+### Serverless
+
+Find the following script in driver-evergreen-tools and make sure you have the following environment variables defined.
+_**Remember**_ some of these are sensitive credentials so keep them safe and only put them in your environment when you need them.
+
+- `PROJECT`
+- `SERVERLESS_DRIVERS_GROUP`
+- `SERVERLESS_API_PUBLIC_KEY`
+- `SERVERLESS_API_PRIVATE_KEY`
+- `SERVERLESS_ATLAS_USER`
+- `SERVERLESS_ATLAS_PASSWORD`
+- `LOADBALANCED`
+
+```sh
+$DRIVERS_TOOLS/.evergreen/serverless/create-instance.sh
+```
+
+this will output an evergreen expansion in `serverless-expansion.yml` in the current working directory.
+
+```yml
+MONGODB_URI: xxx
+MONGODB_SRV_URI: xxx
+SERVERLESS_INSTANCE_NAME: xxx
+SSL: xxx
+AUTH: xxx
+TOPOLOGY: xxx
+SERVERLESS: xxx
+MULTI_ATLASPROXY_SERVERLESS_URI: xxx
+SINGLE_ATLASPROXY_SERVERLESS_URI: xxx
+```
+
+Since it's a flat yaml file, you can run the following to get a sourceable environment file:
+
+```sh
+cat serverless-expansion.yml | sed 's/: /=/g' > serverless.env
+```
+
+Before sourcing `serverless.env`, make some adjustments that are equivalent to what our EVG does:
+
+- Change `MONGODB_URI` to be the same as `SINGLE_ATLASPROXY_SERVERLESS_URI`
+- Add `SINGLE_MONGOS_LB_URI` and `MULTI_MONGOS_LB_URI` and set them to `SINGLE_ATLASPROXY_SERVERLESS_URI`
+
+Lastly, comment out the `source` of `install-dependencies.sh` command in `.evergreen/run-serverless-tests.sh` and you can run that script directly to test serverless instances from your local machine.
+
+### Load Balanced
+
+You'll first need to start a sharded cluster using your favorite MongoDB orchestration tool of choice.
+The tool should create a cluster with two mongos so you have a uri like `MONGODB_URI=mongodb://host1,host2/`
+Then you need to start a load balancer: you can install `haproxy` on macos via `brew` and use the script provided in drivers-evergreen-tools.
+
+```sh
+$DRIVERS_TOOLS/.evergreen/run-load-balancer.sh start
+```
+
+This will output an evergreen expansion file: `lb-expansion.yml`
+
+```yaml
+SINGLE_MONGOS_LB_URI: "mongodb://127.0.0.1:8000/?loadBalanced=true"
+MULTI_MONGOS_LB_URI: "mongodb://127.0.0.1:8001/?loadBalanced=true"
+```
+
+Since it's a flat yaml file, you can run the following to get a sourceable environment file:
+
+```sh
+cat lb-expansion.yml | sed 's/: /=/g' > lb.env
+```
+
+You have to add an additional environment variable to the end of this `lb.env` file:
+
+```sh
+FAKE_MONGODB_SERVICE_ID="true"
+```
+
+This enables logic in the driver to stick in a fake service id on responses since that's what a real LB deployment is required to do.
+With those variables sourced, you can run the whole test suite as you normally would.
+
+> Please note, `FAKE_MONGODB_SERVICE_ID` will no longer be needed with the completion of [NODE-3431](https://jira.mongodb.org/browse/NODE-3431).
+
+```sh
+npm run check:test
+```
+
+Take note of the `[ topology type: load-balanced ]` printout from mocha to make sure it picked up the environment as expected.
+
+When you are done testing you can shutdown the haproxy load balancer with:
+
+```sh
+$DRIVERS_TOOLS/.evergreen/run-load-balancer.sh stop
+```
+
+### CSFLE
+
+As long as certain environment variables are present and mongodb-client-encryption is installed, FLE will run with a regular mocha execution: `npm run check:test`.
+
+Define the following variables in your environment:
+
+- `AWS_ACCESS_KEY_ID`
+- `AWS_SECRET_ACCESS_KEY`
+- `CSFLE_KMS_PROVIDERS`
+- `AWS_REGION`
+- `AWS_CMK_ID`
+
+### TODO Special Env Sections
+
+- Kerberos
+- AWS Authentication
+- OCSP
+- TLS
+- Atlas Data Lake
+- LDAP
+- Snappy (maybe in general, how to test optional dependencies)
+- Atlas connectivity