docs: add cache reset details to testing.mdx

Author: jescalada

README.md

@@ -116,6 +116,6 @@ If you can't access Slack, you can also [subscribe to our mailing list](mailto:g
 
 Otherwise, if you have a deeper query or require more support, please [raise an issue](https://github.com/finos/git-proxy/issues) 🧵
 
-🤝 Join our [fortnightly Zoom meeting](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595) on Monday, 4PM BST (odd week numbers). 
-🌍 [Convert to your local time](https://www.timeanddate.com/worldclock)
+🤝 Join our [fortnightly Zoom meeting](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595) on Monday, 4PM BST (odd week numbers).  
+🌍 [Convert to your local time](https://www.timeanddate.com/worldclock)  
 📅 [Click here](https://calendar.google.com/calendar/event?action=TEMPLATE&tmeid=MTRvbzM0NG01dWNvNGc4OGJjNWphM2ZtaTZfMjAyNTA2MDJUMTUwMDAwWiBzYW0uaG9sbWVzQGNvbnRyb2wtcGxhbmUuaW8&tmsrc=sam.holmes%40control-plane.io&scp=ALL) for the recurring Google Calendar meeting invite. Alternatively, send an e-mail to [help@finos.org](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595#:~:text=Need-,an,-invite%3F) to get a calendar invitation. 

website/docs/development/contributing.mdx

@@ -48,8 +48,8 @@ When updating the configuration schema, you must also re-generate the reference
 <!-- Notes around signing the CLA. See existing CONTRIBUTING.md -->
 
 ## Community Meetings
-Join our [fortnightly Zoom meeting](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595) on Monday, 4PM BST (odd week numbers). 
-🌍 [Convert to your local time](https://www.timeanddate.com/worldclock)
+Join our [fortnightly Zoom meeting](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595) on Monday, 4PM BST (odd week numbers).  
+🌍 [Convert to your local time](https://www.timeanddate.com/worldclock)  
 [Click here](https://calendar.google.com/calendar/event?action=TEMPLATE&tmeid=MTRvbzM0NG01dWNvNGc4OGJjNWphM2ZtaTZfMjAyNTA2MDJUMTUwMDAwWiBzYW0uaG9sbWVzQGNvbnRyb2wtcGxhbmUuaW8&tmsrc=sam.holmes%40control-plane.io&scp=ALL) for the recurring Google Calendar meeting invite. 
 Alternatively, send an e-mail to [help@finos.org](https://zoom-lfx.platform.linuxfoundation.org/meeting/95849833904?password=99413314-d03a-4b1c-b682-1ede2c399595#:~:text=Need-,an,-invite%3F) to get a calendar invitation. 
 

website/docs/development/testing.mdx

@@ -150,6 +150,33 @@ after(async function () {
   await db.deleteUser('u1');
   await db.deleteUser('u2');
 });
+
+afterEach(() => {
+  sinon.restore();
+});
+```
+
+Note that `after` will execute once after **all** the tests are complete, whereas `afterEach` will execute at the end of **each** test. 
+
+#### Reset sinon and proxyquire cache
+
+**It's very important to reset Sinon and the Proxyquire/require cache after each test** when necessary. This prevents old stubs from leaking into subsequent tests.
+
+Here is an example of a function that resets both of these after each test (`test/chain.test.js`):
+
+```js
+const clearCache = (sandbox) => {
+  delete require.cache[require.resolve('../src/proxy/processors')];
+  delete require.cache[require.resolve('../src/proxy/chain')];
+  sandbox.reset();
+};
+
+...
+
+afterEach(() => {
+  // Clear the module from the cache after each test
+  clearCache(sandboxSinon);
+});
 ```
 
 #### Focus on expected behaviour
@@ -185,7 +212,7 @@ expect(authMethods[0].type).to.equal('local');
 
 If test coverage is still insufficient after writing your tests, check out the [CodeCov report](https://app.codecov.io/gh/finos/git-proxy) after making the PR and take a look at which lines are missing coverage.
 
-### E2E testing with Cypress
+### UI testing with Cypress
 
 Although coverage is currently low, we have introduced Cypress testing to make sure that end-to-end flows are working as expected with every added feature.