diff --git a/controllers/kustomization_controller_patch_test.go b/controllers/kustomization_controller_patch_test.go
index 18ed621e..b90ec202 100644
--- a/controllers/kustomization_controller_patch_test.go
+++ b/controllers/kustomization_controller_patch_test.go
@@ -244,88 +244,4 @@ metadata:
 			Expect(*deployment.Spec.Replicas).To(Equal(int32(2)))
 		})
 	})
-
-	Context("Kustomize functions", func() {
-		var (
-			namespace        *corev1.Namespace
-			kubeconfig       *kustomizev1.KubeConfig
-			artifactFile     string
-			artifactChecksum string
-			artifactURL      string
-			kustomization    *kustomizev1.Kustomization
-		)
-
-		BeforeEach(func() {
-			namespace = &corev1.Namespace{}
-			namespace.Name = "patch-" + randStringRunes(5)
-			Expect(k8sClient.Create(context.Background(), namespace)).To(Succeed())
-
-			kubecfgSecret, err := kubeConfigSecret()
-			Expect(err).ToNot(HaveOccurred())
-			kubecfgSecret.Namespace = namespace.Name
-			Expect(k8sClient.Create(context.Background(), kubecfgSecret)).To(Succeed())
-			kubeconfig = &kustomizev1.KubeConfig{
-				SecretRef: meta.LocalObjectReference{
-					Name: kubecfgSecret.Name,
-				},
-			}
-
-			artifactFile = "patch-" + randStringRunes(5)
-			artifactChecksum, err = initArtifact(artifactServer, "testdata/replacement", artifactFile)
-			Expect(err).ToNot(HaveOccurred())
-			artifactURL, err = artifactServer.URLForFile(artifactFile)
-			Expect(err).ToNot(HaveOccurred())
-
-			gitRepoKey := client.ObjectKey{
-				Name:      fmt.Sprintf("patch-%s", randStringRunes(5)),
-				Namespace: namespace.Name,
-			}
-			gitRepo := readyGitRepository(gitRepoKey, artifactURL, "main/"+artifactChecksum, artifactChecksum)
-			Expect(k8sClient.Create(context.Background(), gitRepo)).To(Succeed())
-			Expect(k8sClient.Status().Update(context.Background(), gitRepo)).To(Succeed())
-
-			kustomizationKey := types.NamespacedName{
-				Name:      "patch-" + randStringRunes(5),
-				Namespace: namespace.Name,
-			}
-			kustomization = &kustomizev1.Kustomization{
-				ObjectMeta: metav1.ObjectMeta{
-					Name:      kustomizationKey.Name,
-					Namespace: kustomizationKey.Namespace,
-				},
-				Spec: kustomizev1.KustomizationSpec{
-					Path:       "./",
-					KubeConfig: kubeconfig,
-					SourceRef: kustomizev1.CrossNamespaceSourceReference{
-						Name:      gitRepoKey.Name,
-						Namespace: gitRepoKey.Namespace,
-						Kind:      sourcev1.GitRepositoryKind,
-					},
-					TargetNamespace: namespace.Name,
-				},
-			}
-		})
-
-		AfterEach(func() {
-			Expect(k8sClient.Delete(context.Background(), namespace)).To(Succeed())
-		})
-
-		It("kustomize replacement transformer", func() {
-			Expect(k8sClient.Create(context.TODO(), kustomization)).To(Succeed())
-
-			Eventually(func() bool {
-				var obj kustomizev1.Kustomization
-				_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), &obj)
-				return obj.Status.LastAppliedRevision == "main/"+artifactChecksum
-			}, timeout, time.Second).Should(BeTrue())
-
-			var quota corev1.ResourceQuota
-			Expect(k8sClient.Get(context.TODO(), client.ObjectKey{
-				Name:      "common",
-				Namespace: namespace.Name,
-			}, &quota)).To(Succeed())
-			val := quota.Spec.Hard[corev1.ResourceLimitsMemory]
-			Expect(val.String()).To(Equal("24Gi"))
-		})
-	})
 })
diff --git a/controllers/kustomization_controller_transformers_test.go b/controllers/kustomization_controller_transformers_test.go
new file mode 100644
index 00000000..292aac96
--- /dev/null
+++ b/controllers/kustomization_controller_transformers_test.go
@@ -0,0 +1,376 @@
+/*
+Copyright 2021 The Flux authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controllers
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"strings"
+	"time"
+
+	sourcev1 "github.com/fluxcd/source-controller/api/v1beta1"
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+	appsv1 "k8s.io/api/apps/v1"
+	corev1 "k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/types"
+	"sigs.k8s.io/controller-runtime/pkg/client"
+
+	"github.com/fluxcd/pkg/apis/meta"
+	"github.com/fluxcd/pkg/testserver"
+
+	kustomizev1 "github.com/fluxcd/kustomize-controller/api/v1beta1"
+)
+
+var _ = Describe("KustomizationReconciler", func() {
+	var (
+		artifactServer *testserver.ArtifactServer
+	)
+
+	BeforeEach(func() {
+		var err error
+		artifactServer, err = testserver.NewTempArtifactServer()
+		Expect(err).ToNot(HaveOccurred())
+		artifactServer.Start()
+	})
+
+	AfterEach(func() {
+		artifactServer.Stop()
+		os.RemoveAll(artifactServer.Root())
+	})
+
+	Context("Kustomize transformers", func() {
+		var (
+			namespace        *corev1.Namespace
+			kubeconfig       *kustomizev1.KubeConfig
+			artifactFile     string
+			artifactChecksum string
+			artifactURL      string
+			kustomization    *kustomizev1.Kustomization
+			deployNamespace  *corev1.Namespace
+		)
+
+		BeforeEach(func() {
+			namespace = &corev1.Namespace{}
+			namespace.Name = "patch-" + randStringRunes(5)
+			Expect(k8sClient.Create(context.Background(), namespace)).To(Succeed())
+
+			deployNamespace = &corev1.Namespace{}
+			deployNamespace.Name = "deploy-system"
+			Expect(k8sClient.Create(context.Background(), deployNamespace)).To(Succeed())
+
+			kubecfgSecret, err := kubeConfigSecret()
+			Expect(err).ToNot(HaveOccurred())
+			kubecfgSecret.Namespace = namespace.Name
+			Expect(k8sClient.Create(context.Background(), kubecfgSecret)).To(Succeed())
+			kubeconfig = &kustomizev1.KubeConfig{
+				SecretRef: meta.LocalObjectReference{
+					Name: kubecfgSecret.Name,
+				},
+			}
+
+			artifactFile = "patch-" + randStringRunes(5)
+			artifactChecksum, err = initArtifact(artifactServer, "testdata/transformers", artifactFile)
+			Expect(err).ToNot(HaveOccurred())
+			artifactURL, err = artifactServer.URLForFile(artifactFile)
+			Expect(err).ToNot(HaveOccurred())
+
+			gitRepoKey := client.ObjectKey{
+				Name:      fmt.Sprintf("patch-%s", randStringRunes(5)),
+				Namespace: namespace.Name,
+			}
+			gitRepo := readyGitRepository(gitRepoKey, artifactURL, "main/"+artifactChecksum, artifactChecksum)
+			Expect(k8sClient.Create(context.Background(), gitRepo)).To(Succeed())
+			Expect(k8sClient.Status().Update(context.Background(), gitRepo)).To(Succeed())
+
+			kustomizationKey := types.NamespacedName{
+				Name:      "patch-" + randStringRunes(5),
+				Namespace: namespace.Name,
+			}
+			kustomization = &kustomizev1.Kustomization{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      kustomizationKey.Name,
+					Namespace: kustomizationKey.Namespace,
+				},
+				Spec: kustomizev1.KustomizationSpec{
+					Path:       "./",
+					KubeConfig: kubeconfig,
+					SourceRef: kustomizev1.CrossNamespaceSourceReference{
+						Name:      gitRepoKey.Name,
+						Namespace: gitRepoKey.Namespace,
+						Kind:      sourcev1.GitRepositoryKind,
+					},
+				},
+			}
+
+			Expect(k8sClient.Create(context.TODO(), kustomization)).To(Succeed())
+
+			Eventually(func() bool {
+				var obj kustomizev1.Kustomization
+				_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), &obj)
+				return obj.Status.LastAppliedRevision == "main/"+artifactChecksum
+			}, timeout, time.Second).Should(BeTrue())
+
+		})
+
+		AfterEach(func() {
+			Expect(k8sClient.Delete(context.Background(), kustomization)).To(Succeed())
+			Expect(k8sClient.Delete(context.Background(), deployNamespace)).To(Succeed())
+			Expect(k8sClient.Delete(context.Background(), namespace)).To(Succeed())
+		})
+
+		It("kustomize transformers", func() {
+			quota := &corev1.ResourceQuota{}
+
+			By("namespace and prefix transformers", func() {
+				Expect(k8sClient.Get(context.TODO(), client.ObjectKey{
+					Name:      "test-common-transform",
+					Namespace: deployNamespace.Name,
+				}, quota)).To(Succeed())
+			})
+
+			By("replacement transformer", func() {
+				val := quota.Spec.Hard[corev1.ResourceLimitsMemory]
+				Expect(val.String()).To(Equal("24Gi"))
+			})
+
+			By("annotations transformer", func() {
+				Expect(quota.Annotations["test"]).To(Equal("annotations"))
+			})
+
+			By("label transformer", func() {
+				Expect(quota.Labels["test"]).To(Equal("labels"))
+			})
+
+			By("configmap generator", func() {
+				var configMapList corev1.ConfigMapList
+				Expect(k8sClient.List(context.TODO(), &configMapList)).To(Succeed())
+				Expect(checkConfigMap(&configMapList, "test-metas-transform")).To(Equal(true))
+			})
+
+			By("secret generator", func() {
+				var secretList corev1.SecretList
+				Expect(k8sClient.List(context.TODO(), &secretList)).To(Succeed())
+				Expect(checkSecret(&secretList, "test-secret-transform")).To(Equal(true))
+			})
+
+			deployment := &appsv1.Deployment{}
+			Expect(k8sClient.Get(context.TODO(), types.NamespacedName{
+				Name:      "test-podinfo-transform",
+				Namespace: deployNamespace.Name,
+			}, deployment)).To(Succeed())
+
+			By("patch6902 transformer", func() {
+				Expect(deployment.Labels["patch"]).To(Equal("json6902"))
+			})
+
+			By("patches transformer", func() {
+				Expect(deployment.Labels["app.kubernetes.io/version"]).To(Equal("1.21.0"))
+			})
+
+			By("patchStrategicMerge transformer", func() {
+				Expect(deployment.Spec.Template.Spec.ServiceAccountName).
+					To(Equal("test"))
+			})
+
+			By("image transformer", func() {
+				Expect(deployment.Spec.Template.Spec.Containers[0].Image).
+					To(Equal("podinfo:6.0.0"))
+			})
+
+			By("replica transformer", func() {
+				Expect(int(*deployment.Spec.Replicas)).
+					To(Equal(2))
+			})
+		})
+	})
+
+	Context("Kustomize file transformers", func() {
+		var (
+			namespace        *corev1.Namespace
+			kubeconfig       *kustomizev1.KubeConfig
+			artifactFile     string
+			artifactChecksum string
+			artifactURL      string
+			kustomization    *kustomizev1.Kustomization
+			deployNamespace  *corev1.Namespace
+		)
+
+		BeforeEach(func() {
+			namespace = &corev1.Namespace{}
+			namespace.Name = "patch-" + randStringRunes(5)
+			Expect(k8sClient.Create(context.Background(), namespace)).To(Succeed())
+
+			deployNamespace = &corev1.Namespace{}
+			deployNamespace.Name = "second-system"
+			Expect(k8sClient.Create(context.Background(), deployNamespace)).To(Succeed())
+
+			kubecfgSecret, err := kubeConfigSecret()
+			Expect(err).ToNot(HaveOccurred())
+			kubecfgSecret.Namespace = namespace.Name
+			Expect(k8sClient.Create(context.Background(), kubecfgSecret)).To(Succeed())
+			kubeconfig = &kustomizev1.KubeConfig{
+				SecretRef: meta.LocalObjectReference{
+					Name: kubecfgSecret.Name,
+				},
+			}
+
+			artifactFile = "patch-" + randStringRunes(5)
+			artifactChecksum, err = initArtifact(artifactServer, "testdata/file-transformer", artifactFile)
+			Expect(err).ToNot(HaveOccurred())
+			artifactURL, err = artifactServer.URLForFile(artifactFile)
+			Expect(err).ToNot(HaveOccurred())
+
+			gitRepoKey := client.ObjectKey{
+				Name:      fmt.Sprintf("patch-%s", randStringRunes(5)),
+				Namespace: namespace.Name,
+			}
+			gitRepo := readyGitRepository(gitRepoKey, artifactURL, "main/"+artifactChecksum, artifactChecksum)
+			Expect(k8sClient.Create(context.Background(), gitRepo)).To(Succeed())
+			Expect(k8sClient.Status().Update(context.Background(), gitRepo)).To(Succeed())
+
+			kustomizationKey := types.NamespacedName{
+				Name:      "patch-" + randStringRunes(5),
+				Namespace: namespace.Name,
+			}
+			kustomization = &kustomizev1.Kustomization{
+				ObjectMeta: metav1.ObjectMeta{
+					Name:      kustomizationKey.Name,
+					Namespace: kustomizationKey.Namespace,
+				},
+				Spec: kustomizev1.KustomizationSpec{
+					Path:       "./",
+					KubeConfig: kubeconfig,
+					SourceRef: kustomizev1.CrossNamespaceSourceReference{
+						Name:      gitRepoKey.Name,
+						Namespace: gitRepoKey.Namespace,
+						Kind:      sourcev1.GitRepositoryKind,
+					},
+				},
+			}
+
+			Expect(k8sClient.Create(context.TODO(), kustomization)).To(Succeed())
+
+			Eventually(func() bool {
+				var obj kustomizev1.Kustomization
+				_ = k8sClient.Get(context.Background(), client.ObjectKeyFromObject(kustomization), &obj)
+				return obj.Status.LastAppliedRevision == "main/"+artifactChecksum
+			}, timeout, time.Second).Should(BeTrue())
+
+		})
+
+		AfterEach(func() {
+			Expect(k8sClient.Delete(context.Background(), deployNamespace)).To(Succeed())
+			Expect(k8sClient.Delete(context.Background(), namespace)).To(Succeed())
+		})
+
+		It("kustomize file transformers", func() {
+			quota := &corev1.ResourceQuota{}
+
+			By("namespace and prefix transformers", func() {
+				Expect(k8sClient.Get(context.TODO(), client.ObjectKey{
+					Name:      "test-common-transform",
+					Namespace: deployNamespace.Name,
+				}, quota)).To(Succeed())
+			})
+
+			By("replacement transformer", func() {
+				val := quota.Spec.Hard[corev1.ResourceLimitsMemory]
+				Expect(val.String()).To(Equal("24Gi"))
+			})
+
+			By("annotations transformer", func() {
+				Expect(quota.Annotations["test"]).To(Equal("annotations"))
+			})
+
+			By("label transformer", func() {
+				Expect(quota.Labels["test"]).To(Equal("labels"))
+			})
+
+			By("configmap generator", func() {
+				var configMapList corev1.ConfigMapList
+				Expect(k8sClient.List(context.TODO(), &configMapList)).To(Succeed())
+				Expect(checkConfigMap(&configMapList, "test-metas-transform")).To(Equal(true))
+			})
+
+			By("secret generator", func() {
+				var secretList corev1.SecretList
+				Expect(k8sClient.List(context.TODO(), &secretList)).To(Succeed())
+				Expect(checkSecret(&secretList, "test-secret-transform")).To(Equal(true))
+			})
+
+			deployment := &appsv1.Deployment{}
+			Expect(k8sClient.Get(context.TODO(), types.NamespacedName{
+				Name:      "test-podinfo-transform",
+				Namespace: deployNamespace.Name,
+			}, deployment)).To(Succeed())
+
+			By("patch6902 transformer", func() {
+				Expect(deployment.Labels["patch"]).To(Equal("json6902"))
+			})
+
+			By("patches transformer", func() {
+				Expect(deployment.Labels["app.kubernetes.io/version"]).To(Equal("1.21.0"))
+			})
+
+			By("patchStrategicMerge transformer", func() {
+				Expect(deployment.Spec.Template.Spec.ServiceAccountName).
+					To(Equal("test"))
+			})
+
+			By("image transformer", func() {
+				Expect(deployment.Spec.Template.Spec.Containers[0].Image).
+					To(Equal("podinfo:6.0.0"))
+			})
+
+			By("replica transformer", func() {
+				Expect(int(*deployment.Spec.Replicas)).
+					To(Equal(2))
+			})
+		})
+	})
+})
+
+func checkConfigMap(list *corev1.ConfigMapList, name string) bool {
+	if list == nil {
+		return false
+	}
+
+	for _, configMap := range list.Items {
+		if strings.Contains(configMap.Name, name) {
+			return true
+		}
+	}
+
+	return false
+}
+
+func checkSecret(list *corev1.SecretList, name string) bool {
+	if list == nil {
+		return false
+	}
+
+	for _, secret := range list.Items {
+		if strings.Contains(secret.Name, name) {
+			return true
+		}
+	}
+
+	return false
+}
diff --git a/controllers/testdata/file-transformer/annotation-transformer.yaml b/controllers/testdata/file-transformer/annotation-transformer.yaml
new file mode 100644
index 00000000..abac25fc
--- /dev/null
+++ b/controllers/testdata/file-transformer/annotation-transformer.yaml
@@ -0,0 +1,9 @@
+apiVersion: builtin
+kind: AnnotationsTransformer
+metadata:
+  name: notImportantHere
+annotations:
+  test: annotations
+fieldSpecs:
+  - path: metadata/annotations
+    create: true
diff --git a/controllers/testdata/file-transformer/configmap-generator.yaml b/controllers/testdata/file-transformer/configmap-generator.yaml
new file mode 100644
index 00000000..f9903362
--- /dev/null
+++ b/controllers/testdata/file-transformer/configmap-generator.yaml
@@ -0,0 +1,7 @@
+apiVersion: builtin
+kind: ConfigMapGenerator
+metadata:
+  name: metas
+literals:
+  - limits.cpu=16
+  - limits.memory=24Gi
diff --git a/controllers/testdata/file-transformer/deployment.yaml b/controllers/testdata/file-transformer/deployment.yaml
new file mode 100644
index 00000000..73eabc01
--- /dev/null
+++ b/controllers/testdata/file-transformer/deployment.yaml
@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: podinfo
+  labels:
+    app: podinfo
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: podinfo
+  template:
+    metadata:
+      labels:
+        app: podinfo
+    spec:
+      containers:
+        - name: podinfo
+          image: podinfo
diff --git a/controllers/testdata/file-transformer/imagetag-transformer.yaml b/controllers/testdata/file-transformer/imagetag-transformer.yaml
new file mode 100644
index 00000000..36dc27ec
--- /dev/null
+++ b/controllers/testdata/file-transformer/imagetag-transformer.yaml
@@ -0,0 +1,9 @@
+apiVersion: builtin
+kind: ImageTagTransformer
+metadata:
+  name: notImportantHere
+imageTag:
+  name: podinfo
+  newTag: 6.0.0
+fieldSpecs:
+  - path: spec/template/spec/containers[]/image
diff --git a/controllers/testdata/file-transformer/kustomization.yaml b/controllers/testdata/file-transformer/kustomization.yaml
new file mode 100644
index 00000000..14a81bb8
--- /dev/null
+++ b/controllers/testdata/file-transformer/kustomization.yaml
@@ -0,0 +1,21 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - quota.yaml
+  - deployment.yaml
+
+generators:
+  - configmap-generator.yaml
+  - secret-generator.yaml
+
+transformers:
+  - annotation-transformer.yaml
+  - label-transformer.yaml
+  - imagetag-transformer.yaml
+  - namespace-transformer.yaml
+  - patch-transformer.yaml
+  - patchjson6902-transformer.yaml
+  - patchStrategicMerge-transformer.yaml
+  - prefixsuffix-transformer.yaml
+  - replicas-transformer.yaml
+  - replacement-transformer.yaml
diff --git a/controllers/testdata/file-transformer/label-transformer.yaml b/controllers/testdata/file-transformer/label-transformer.yaml
new file mode 100644
index 00000000..ebe23ea3
--- /dev/null
+++ b/controllers/testdata/file-transformer/label-transformer.yaml
@@ -0,0 +1,15 @@
+apiVersion: builtin
+kind: LabelTransformer
+metadata:
+  name: notImportantHere
+labels:
+  test: labels
+fieldSpecs:
+  - path: metadata/labels
+    create: true
+  - path: spec/selector/matchLabels
+    create: true
+    kind: Deployment
+  - path: spec/template/metadata/labels
+    create: true
+    kind: Deployment
diff --git a/controllers/testdata/file-transformer/namespace-transformer.yaml b/controllers/testdata/file-transformer/namespace-transformer.yaml
new file mode 100644
index 00000000..e594bd1a
--- /dev/null
+++ b/controllers/testdata/file-transformer/namespace-transformer.yaml
@@ -0,0 +1,8 @@
+apiVersion: builtin
+kind: NamespaceTransformer
+metadata:
+  name: notImportantHere
+  namespace: second-system
+fieldSpecs:
+  - path: metadata/namespace
+    create: true
diff --git a/controllers/testdata/file-transformer/patch-transformer.yaml b/controllers/testdata/file-transformer/patch-transformer.yaml
new file mode 100644
index 00000000..4e1971e9
--- /dev/null
+++ b/controllers/testdata/file-transformer/patch-transformer.yaml
@@ -0,0 +1,5 @@
+apiVersion: builtin
+kind: PatchTransformer
+metadata:
+  name: notImportantHere
+path: patch.yaml
diff --git a/controllers/testdata/file-transformer/patch.yaml b/controllers/testdata/file-transformer/patch.yaml
new file mode 100644
index 00000000..c36fcfd2
--- /dev/null
+++ b/controllers/testdata/file-transformer/patch.yaml
@@ -0,0 +1,6 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: podinfo
+  labels:
+    app.kubernetes.io/version: 1.21.0
diff --git a/controllers/testdata/file-transformer/patchStrategicMerge-transformer.yaml b/controllers/testdata/file-transformer/patchStrategicMerge-transformer.yaml
new file mode 100644
index 00000000..f7ce2a78
--- /dev/null
+++ b/controllers/testdata/file-transformer/patchStrategicMerge-transformer.yaml
@@ -0,0 +1,13 @@
+apiVersion: builtin
+kind: PatchStrategicMergeTransformer
+metadata:
+  name: notImportantHere
+patches: |-
+  apiVersion: apps/v1
+  kind: Deployment
+  metadata:
+    name: podinfo
+  spec:
+    template:
+      spec:
+        serviceAccountName: test
diff --git a/controllers/testdata/file-transformer/patchjson6902-transformer.yaml b/controllers/testdata/file-transformer/patchjson6902-transformer.yaml
new file mode 100644
index 00000000..7d2bdcae
--- /dev/null
+++ b/controllers/testdata/file-transformer/patchjson6902-transformer.yaml
@@ -0,0 +1,10 @@
+apiVersion: builtin
+kind: PatchJson6902Transformer
+metadata:
+  name: notImportantHere
+target:
+  group: apps
+  version: v1
+  kind: Deployment
+  name: podinfo
+jsonOp: '[{"op": "add", "path": "/metadata/labels/patch", "value": "json6902"}]'
diff --git a/controllers/testdata/file-transformer/prefixsuffix-transformer.yaml b/controllers/testdata/file-transformer/prefixsuffix-transformer.yaml
new file mode 100644
index 00000000..5778dcb2
--- /dev/null
+++ b/controllers/testdata/file-transformer/prefixsuffix-transformer.yaml
@@ -0,0 +1,8 @@
+apiVersion: builtin
+kind: PrefixSuffixTransformer
+metadata:
+  name: notImportantHere
+prefix: test-
+suffix: -transform
+fieldSpecs:
+  - path: metadata/name
diff --git a/controllers/testdata/replacement/quota.yaml b/controllers/testdata/file-transformer/quota.yaml
similarity index 100%
rename from controllers/testdata/replacement/quota.yaml
rename to controllers/testdata/file-transformer/quota.yaml
diff --git a/controllers/testdata/replacement/kustomization.yaml b/controllers/testdata/file-transformer/replacement-transformer.yaml
similarity index 53%
rename from controllers/testdata/replacement/kustomization.yaml
rename to controllers/testdata/file-transformer/replacement-transformer.yaml
index faf05ebc..7188b4a6 100644
--- a/controllers/testdata/replacement/kustomization.yaml
+++ b/controllers/testdata/file-transformer/replacement-transformer.yaml
@@ -1,15 +1,7 @@
-apiVersion: kustomize.config.k8s.io/v1beta1
-kind: Kustomization
-resources:
-  - quota.yaml
-
-namespace: integrations
-configMapGenerator:
-  - name: metas
-    literals:
-      - limits.cpu=16
-      - limits.memory=24Gi
-
+apiVersion: builtin
+kind: ReplacementTransformer
+metadata:
+  name: notImportantHere
 replacements:
   - source:
       kind: ConfigMap
diff --git a/controllers/testdata/file-transformer/replicas-transformer.yaml b/controllers/testdata/file-transformer/replicas-transformer.yaml
new file mode 100644
index 00000000..211b15c4
--- /dev/null
+++ b/controllers/testdata/file-transformer/replicas-transformer.yaml
@@ -0,0 +1,20 @@
+apiVersion: builtin
+kind: ReplicaCountTransformer
+metadata:
+  name: notImportantHere
+replica:
+  count: 2
+  name: podinfo
+fieldSpecs:
+  - path: spec/replicas
+    create: true
+    kind: Deployment
+  - path: spec/replicas
+    create: true
+    kind: ReplicationController
+  - path: spec/replicas
+    create: true
+    kind: ReplicaSet
+  - path: spec/replicas
+    create: true
+    kind: StatefulSet
diff --git a/controllers/testdata/file-transformer/secret-generator.yaml b/controllers/testdata/file-transformer/secret-generator.yaml
new file mode 100644
index 00000000..a11e4a78
--- /dev/null
+++ b/controllers/testdata/file-transformer/secret-generator.yaml
@@ -0,0 +1,7 @@
+apiVersion: builtin
+kind: SecretGenerator
+metadata:
+  name: secret
+literals:
+  - username=admin
+  - password=password
diff --git a/controllers/testdata/transformers/deployment.yaml b/controllers/testdata/transformers/deployment.yaml
new file mode 100644
index 00000000..73eabc01
--- /dev/null
+++ b/controllers/testdata/transformers/deployment.yaml
@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: podinfo
+  labels:
+    app: podinfo
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: podinfo
+  template:
+    metadata:
+      labels:
+        app: podinfo
+    spec:
+      containers:
+        - name: podinfo
+          image: podinfo
diff --git a/controllers/testdata/transformers/kustomization.yaml b/controllers/testdata/transformers/kustomization.yaml
new file mode 100644
index 00000000..b9f6a682
--- /dev/null
+++ b/controllers/testdata/transformers/kustomization.yaml
@@ -0,0 +1,77 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - quota.yaml
+  - deployment.yaml
+
+namespace: deploy-system
+
+namePrefix: test-
+
+nameSuffix: -transform
+
+commonAnnotations:
+  test: annotations
+
+commonLabels:
+  test: labels
+
+images:
+  - name: podinfo
+    newTag: 6.0.0
+
+replicas:
+  - name: podinfo
+    count: 2
+
+configMapGenerator:
+  - name: metas
+    literals:
+      - limits.cpu=16
+      - limits.memory=24Gi
+
+secretGenerator:
+  - name: secret
+    literals:
+      - username=admin
+      - password=password
+
+patchesStrategicMerge:
+  - |-
+    apiVersion: apps/v1
+    kind: Deployment
+    metadata:
+      name: podinfo
+    spec:
+      template:
+        spec:
+          serviceAccountName: test
+
+patchesJson6902:
+  - target:
+      version: v1
+      kind: Deployment
+      name: podinfo
+    patch: |-
+      - op: add
+        path: /metadata/labels/patch
+        value: json6902
+
+patches:
+  - path: patch.yaml
+    target:
+      kind: Deployment
+      name: podinfo
+
+
+replacements:
+  - source:
+      kind: ConfigMap
+      name: metas
+      fieldPath: data.[limits.memory]
+    targets:
+      - select:
+          name: common
+          kind: ResourceQuota
+        fieldPaths:
+          - spec.hard.[limits.memory]
diff --git a/controllers/testdata/transformers/patch.yaml b/controllers/testdata/transformers/patch.yaml
new file mode 100644
index 00000000..f9f8e864
--- /dev/null
+++ b/controllers/testdata/transformers/patch.yaml
@@ -0,0 +1,6 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: podinfo
+  labels:
+    app.kubernetes.io/version: 1.21.0
\ No newline at end of file
diff --git a/controllers/testdata/transformers/quota.yaml b/controllers/testdata/transformers/quota.yaml
new file mode 100644
index 00000000..9cc0c624
--- /dev/null
+++ b/controllers/testdata/transformers/quota.yaml
@@ -0,0 +1,10 @@
+apiVersion: v1
+kind: ResourceQuota
+metadata:
+  name: common
+  namespace: $NAMESPACE
+spec:
+  hard:
+    limits.cpu: "1"
+    limits.memory: "1Gi"
+    resourcequotas: "1"