fly-by: Allow specifying packages to test (#83)

* fly-by: Allow specifying packages to test

* fly-by: Use k8s 1.28.0 binaries for testing

Makefile

@@ -2,7 +2,7 @@
 # Image URL to use all building/pushing image targets
 IMG ?= controller:latest
 # ENVTEST_K8S_VERSION refers to the version of kubebuilder assets to be downloaded by envtest binary.
-ENVTEST_K8S_VERSION = 1.26.1
+ENVTEST_K8S_VERSION = 1.28.0
 
 TOOLS_DIR := hack/tools
 
@@ -60,9 +60,12 @@ vet: ## Run go vet against code.
 lint: ## Run lint.
 	go run -modfile ./hack/tools/go.mod github.com/golangci/golangci-lint/cmd/golangci-lint run --timeout 5m -c .golangci.yml
 
+# Package names to test
+WHAT ?= ./...
+
 .PHONY: test
-test: manifests generate fmt vet envtest ## Run tests.
-	KUBEBUILDER_ASSETS="$(shell $(ENVTEST) use $(ENVTEST_K8S_VERSION) --bin-dir $(LOCALBIN) -p path)" go test ./... -coverprofile cover.out
+test: manifests generate fmt vet envtest ## Run tests. Specify packages to test using WHAT.
+	KUBEBUILDER_ASSETS="$(shell $(ENVTEST) use $(ENVTEST_K8S_VERSION) --bin-dir $(LOCALBIN) -p path)" go test $(WHAT) -coverprofile cover.out
 
 .PHONY: mockgen
 mockgen: ## Generate mocks.