added documentation and test cases for api-versions flag

Signed-off-by: Ashmit Bhardwaj <ashmit.bhardwaj@fmr.com>

pkg/cmd/template.go

@@ -201,7 +201,7 @@ func newTemplateCmd(cfg *action.Configuration, out io.Writer) *cobra.Command {
 	f.BoolVar(&skipTests, "skip-tests", false, "skip tests from templated output")
 	f.BoolVar(&client.IsUpgrade, "is-upgrade", false, "set .Release.IsUpgrade instead of .Release.IsInstall")
 	f.StringVar(&kubeVersion, "kube-version", "", "Kubernetes version used for Capabilities.KubeVersion")
-	f.StringSliceVarP(&extraAPIs, "api-versions", "a", []string{}, "Kubernetes api versions used for Capabilities.APIVersions")
+	f.StringSliceVarP(&extraAPIs, "api-versions", "a", []string{}, "Kubernetes api versions used for Capabilities.APIVersions ( Can specify multiple or separate values with commands. Example --api-versions value1 --api-versions value2 or --api-versions value1, value2)")
 	f.BoolVar(&client.UseReleaseName, "release-name", false, "use release name in the output-dir path.")
 	bindPostRenderFlag(cmd, &client.PostRenderer)
 

pkg/cmd/template_test.go

@@ -83,7 +83,12 @@ func TestTemplateCmd(t *testing.T) {
 		},
 		{
 			name:   "check kube api versions",
-			cmd:    fmt.Sprintf("template --api-versions helm.k8s.io/test '%s'", chartPath),
+			cmd:    fmt.Sprintf("template --api-versions helm.k8s.io/test,helm.k8s.io/test2 '%s'", chartPath),
+			golden: "output/template-with-api-version.txt",
+		},
+		{
+			name:   "check kube api versions",
+			cmd:    fmt.Sprintf("template --api-versions helm.k8s.io/test --api-versions helm.k8s.io/test2 '%s'", chartPath),
 			golden: "output/template-with-api-version.txt",
 		},
 		{

pkg/cmd/testdata/output/template-with-api-version.txt

@@ -75,6 +75,7 @@ metadata:
     kube-version/minor: "20"
     kube-version/version: "v1.20.0"
     kube-api-version/test: v1
+    kube-api-version/test2: v2
 spec:
   type: ClusterIP
   ports:

pkg/cmd/testdata/testcharts/subchart/templates/service.yaml

@@ -11,6 +11,9 @@ metadata:
 {{- if .Capabilities.APIVersions.Has "helm.k8s.io/test" }}
     kube-api-version/test: v1
 {{- end }}
+{{- if .Capabilities.APIVersions.Has "helm.k8s.io/test2" }}
+    kube-api-version/test2: v2
+{{- end }}
 spec:
   type: {{ .Values.service.type }}
   ports: