Add builtin JSON patch transformer

plugin/builtin/patchjson6902transformer/PatchJson6902Transformer_test.go

@@ -0,0 +1,55 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package main_test
+
+import (
+	"testing"
+
+	"sigs.k8s.io/kustomize/pkg/kusttest"
+	"sigs.k8s.io/kustomize/plugin"
+)
+
+func TestPatchJson6902Transformer(t *testing.T) {
+	tc := plugin.NewEnvForTest(t).Set()
+	defer tc.Reset()
+
+	tc.BuildGoPlugin(
+		"builtin", "", "PatchJson6902Transformer")
+
+	th := kusttest_test.NewKustTestPluginHarness(t, "/app")
+
+	th.WriteF("/app/jsonpatch.json", `[
+    {"op": "add", "path": "/spec/replica", "value": "3"}
+]`)
+
+	rm := th.LoadAndRunTransformer(`
+apiVersion: builtin
+kind: PatchJson6902Transformer
+metadata:
+  name: notImportantHere
+patches:
+- target:
+    group: apps
+    version: v1
+    kind: Deployment
+    name: myDeploy
+  path: jsonpatch.json
+`, `
+apiVersion: apps/v1
+metadata:
+  name: myDeploy
+kind: Deployment
+spec:
+  replica: 1
+`)
+
+	th.AssertActualEqualsExpected(rm, `
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: myDeploy
+spec:
+  replica: "3"
+`)
+}