Merge pull request #5616 from segmentio/lizkane222-patch-29

Update environment.md Testing a function section

Author: stayseesong

src/connections/functions/environment.md

@@ -35,6 +35,19 @@ If you're editing an existing function, you can **Save** changes without changin
 
 You can also choose to **Save & Deploy** to push changes to all, or specific functions in your workspace that are already deployed. You might need additional permissions to deploy these changes.
 
+## Testing a function
+You have the option to test your functions code with either a sample event or by loading a default event that you can customize yourself.
+* **Sample event**: When you click **Test with custom event** you can select a sample event from any of your workspace sources to test this function.
+* **Customize the event yourself**: When you click **customize the event yourself** a default event payload loads which you can modify with the desired data. You have the option to paste in a JSON event or click **Manual Mode** and type in the fields manually. If you'd like to locate a recent event from a source that's not available by following the sample event instruction: 
+     1. Navigate to the source debugger.
+     2. Click the event you want to test and copy the raw JSON payload.
+     3. Paste the raw JSON payload into your Function Editor.
+
+Once the payload you want to test is ready, click **Run**.
+
+> info ""
+> If you create settings in your function, then you need to fill in the setting values before clicking **Run**.
+
 ## Deploying source functions
 
 > note ""