Document testing chart locally

README.md

@@ -37,6 +37,21 @@ You can find documentation about the chart [here](./charts/trino/README.md).
 
 ## Development
 
+To test the chart, install it into a Kubernetes cluster. Use `kind` to create a
+Kubernetes cluster running in a container, and `chart-testing` to install the
+chart and run [tests](charts/trino/templates/tests).
+
+```console
+brew install helm kind chart-testing
+kind create cluster
+ct install
+```
+
+To run tests with specific values:
+```console
+ct install --helm-extra-set-args "--set image.tag:448"
+```
+
 The documentation is automatically generated from the chart files. Install a
 git hook to have it automatically updated when committing changes. Make sure
 you [install the pre-commit binary](https://pre-commit.com/#install), then run: