Fix capabilities changes leaking into other tests

Signed-off-by: Thomas Dy <thatsmydoing@gmail.com>

cmd/helm/testdata/output/template-show-only-multiple.txt

@@ -10,7 +10,6 @@ metadata:
     kube-version/major: "1"
     kube-version/minor: "20"
     kube-version/version: "v1.20.0"
-    kube-api-version/test: v1
 spec:
   type: ClusterIP
   ports:

cmd/helm/testdata/output/template-show-only-one.txt

@@ -10,7 +10,6 @@ metadata:
     kube-version/major: "1"
     kube-version/minor: "20"
     kube-version/version: "v1.20.0"
-    kube-api-version/test: v1
 spec:
   type: ClusterIP
   ports:

cmd/helm/testdata/output/template-skip-tests.txt

@@ -74,7 +74,6 @@ metadata:
     kube-version/major: "1"
     kube-version/minor: "20"
     kube-version/version: "v1.20.0"
-    kube-api-version/test: v1
 spec:
   type: ClusterIP
   ports:

cmd/helm/testdata/output/template-with-crds.txt

@@ -91,7 +91,6 @@ metadata:
     kube-version/major: "1"
     kube-version/minor: "20"
     kube-version/version: "v1.20.0"
-    kube-api-version/test: v1
 spec:
   type: ClusterIP
   ports:

cmd/helm/testdata/output/template-with-kube-version.txt

@@ -11,7 +11,8 @@ kind: Role
 metadata:
   name: subchart-role
 rules:
-- resources: ["*"]
+- apiGroups: [""]
+  resources: ["pods"]
   verbs: ["get","list","watch"]
 ---
 # Source: subchart/templates/subdir/rolebinding.yaml
@@ -82,3 +83,32 @@ spec:
     name: nginx
   selector:
     app.kubernetes.io/name: subchart
+---
+# Source: subchart/templates/tests/test-config.yaml
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: "RELEASE-NAME-testconfig"
+  annotations:
+    "helm.sh/hook": test
+data:
+  message: Hello World
+---
+# Source: subchart/templates/tests/test-nothing.yaml
+apiVersion: v1
+kind: Pod
+metadata:
+  name: "RELEASE-NAME-test"
+  annotations:
+    "helm.sh/hook": test
+spec:
+  containers:
+    - name: test
+      image: "alpine:latest"
+      envFrom:
+        - configMapRef:
+            name: "RELEASE-NAME-testconfig"
+      command:
+        - echo
+        - "$message"
+  restartPolicy: Never

pkg/action/install.go

@@ -198,7 +198,7 @@ func (i *Install) Run(chrt *chart.Chart, vals map[string]interface{}) (*release.
 	if i.ClientOnly {
 		// Add mock objects in here so it doesn't use Kube API server
 		// NOTE(bacongobbler): used for `helm template`
-		i.cfg.Capabilities = chartutil.DefaultCapabilities
+		i.cfg.Capabilities = chartutil.DefaultCapabilities.Copy()
 		if i.KubeVersion != nil {
 			i.cfg.Capabilities.KubeVersion = *i.KubeVersion
 		}

pkg/chartutil/capabilities.go

@@ -59,6 +59,14 @@ type Capabilities struct {
 	HelmVersion helmversion.BuildInfo
 }
 
+func (capabilities *Capabilities) Copy() *Capabilities {
+	return &Capabilities{
+		KubeVersion: capabilities.KubeVersion,
+		APIVersions: capabilities.APIVersions,
+		HelmVersion: capabilities.HelmVersion,
+	}
+}
+
 // KubeVersion is the Kubernetes version.
 type KubeVersion struct {
 	Version string // Kubernetes version