Merge pull request #4274 from cdr/jsjoeio-testing-guidelines

docs: update section around testing

docs/CONTRIBUTING.md

@@ -8,8 +8,9 @@
 - [Development workflow](#development-workflow)
   - [Updates to VS Code](#updates-to-vs-code)
   - [Build](#build)
-  - [Test](#test)
+- [Test](#test)
   - [Unit tests](#unit-tests)
+  - [Script tests](#script-tests)
   - [Integration tests](#integration-tests)
   - [End-to-end tests](#end-to-end-tests)
 - [Structure](#structure)
@@ -129,13 +130,14 @@ yarn package
 > If you need your builds to support older distros, run the build commands
 > inside a Docker container with all the build requirements installed.
 
-### Test
+## Test
 
-There are three kinds of tests in code-server:
+There are four kinds of tests in code-server:
 
 1. Unit tests
-2. Integration tests
+2. Script tests
-3. End-to-end tests
+3. Integration tests
+4. End-to-end tests
 
 ### Unit tests
 
@@ -146,6 +148,14 @@ These live under [test/unit](../test/unit).
 
 We use unit tests for functions and things that can be tested in isolation. The file structure is modeled closely after `/src` so it's easy for people to know where test files should live.
 
+### Script tests
+
+Our script tests are written in bash and run using [bats](https://github.com/bats-core/bats-core).
+
+These tests live under `test/scripts`.
+
+We use these to test anything related to our scripts (most of which live under `ci`).
+
 ### Integration tests
 
 These are a work in progress. We build code-server and run a script called

docs/MAINTAINING.md

@@ -19,6 +19,7 @@
     - [Docker](#docker)
     - [Homebrew](#homebrew)
     - [npm](#npm)
+- [Testing](#testing)
 - [Documentation](#documentation)
   - [Troubleshooting](#troubleshooting)
 
@@ -214,6 +215,20 @@ We publish code-server as a npm package [here](https://www.npmjs.com/package/cod
 
 This is currently automated with the release process.
 
+## Testing
+
+Our testing structure is laid out under our [Contributing docs](https://coder.com/docs/code-server/latest/CONTRIBUTING#test).
+
+We hope to eventually hit 100% test converage with our unit tests, and maybe one day our scripts (coverage not tracked currently).
+
+If you're ever looking to add more tests, here are a few ways to get started:
+
+- run `yarn test:unit` and look at the coverage chart. You'll see all the uncovered lines. This is a good place to start.
+- look at `test/scripts` to see which scripts are tested. We can always use more tests there.
+- look at `test/e2e`. We can always use more end-to-end tests.
+
+Otherwise, talk to a current maintainer and ask which part of the codebase is lacking most when it comes to tests.
+
 ## Documentation
 
 ### Troubleshooting