add validate_hostpath testrunner

examples/best_practices/resources/resource_validate_host_path.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Pod
+metadata:
+  name: image-with-hostpath
+  labels:
+    app.type: prod
+    namespace: "my-namespace"
+spec:
+  containers:
+  - name: image-with-hostpath
+    image: docker.io/nautiker/curl
+    volumeMounts:
+    - name: var-lib-etcd
+      mountPath: /var/lib
+  volumes:
+  - name: var-lib-etcd
+    hostPath:
+      path: /var/lib

pkg/testrunner/testrunner_test.go

@@ -83,3 +83,7 @@ func Test_mutate_pod_disable_automoutingapicred_pass(t *testing.T) {
 func Test_validate_default_namespace(t *testing.T) {
 	testScenario(t, "test/scenarios/test/scenario_validate_default_namespace.yaml")
 }
+
+func Test_validate_host_path(t *testing.T) {
+	testScenario(t, "test/scenarios/test/scenario_validate_host_path.yaml")
+}

test/scenarios/test/scenario_validate_host_path.yaml

@@ -0,0 +1,18 @@
+# file path relative to project root
+input:
+  policy: examples/best_practices/policy_validate_host_path.yaml
+  resource: examples/best_practices/resources/resource_validate_host_path.yaml
+expected:
+  validation:
+    policyresponse:
+      policy: validate-host-path
+      resource:
+        kind: Pod
+        apiVersion: v1
+        namespace: ''
+        name: "image-with-hostpath"
+      rules:
+        - name: validate-host-path
+          type: Validation
+          message: Validation rule 'validate-host-path' failed at '/spec/volumes/0/hostPath/path/' for resource Pod//image-with-hostpath. Host path '/var/lib/' is not allowed
+          success: false