Cut more ties to k8sdeps

Add tests for all the plugins.

plugin/someteam.example.com/v1/stringprefixer/StringPrefixer_test.go

@@ -0,0 +1,39 @@
+// 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 TestStringPrefixerPlugin(t *testing.T) {
+	tc := plugin.NewEnvForTest(t).Set()
+	defer tc.Reset()
+
+	tc.BuildGoPlugin(
+		"someteam.example.com", "v1", "StringPrefixer")
+	th := kusttest_test.NewKustTestPluginHarness(t, "/app")
+
+	m := th.LoadAndRunTransformer(`
+apiVersion: someteam.example.com/v1
+kind: StringPrefixer
+metadata:
+  name: wowsa
+`,
+		`apiVersion: apps/v1
+kind: MeatBall
+metadata:
+  name: meatball
+`)
+
+	th.AssertActualEqualsExpected(m, `
+apiVersion: apps/v1
+kind: MeatBall
+metadata:
+  name: wowsa-meatball
+`)
+}