Make: Add `helm-test` target. (#13652)

Co-authored-by: marcel2012 <13705842+marcel2012@users.noreply.github.com>

Makefile

@@ -156,6 +156,10 @@ test:  ## Run go unit tests.
 		GOFLAGS="-buildvcs=false" \
 		test/test.sh
 
+.PHONY: helm-test
+helm-test: ## Run helm unit tests.
+	helm unittest charts/ingress-nginx --file "tests/**/*_test.yaml"
+
 .PHONY: lua-test
 lua-test: ## Run lua unit tests.
 	@build/run-in-docker.sh \

docs/developer-guide/getting-started.md

@@ -88,6 +88,12 @@ Valid values are defined in the describe definition of the e2e tests like [Defau
 
 The complete list of tests can be found [here](../e2e-tests.md)
 
+**Run Helm unit tests**
+
+```console
+make helm-test
+```
+
 ### Custom docker image
 
 In some cases, it can be useful to build a docker image and publish such an image to a private or custom registry location.