diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/main.go b/pkg/app/pipedv1/plugin/kubernetes_multicluster/main.go
index 04e7d3fc5d..5cd8f8eb0e 100644
--- a/pkg/app/pipedv1/plugin/kubernetes_multicluster/main.go
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/main.go
@@ -21,6 +21,7 @@ import (
 
 	"github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/deployment"
 	"github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/livestate"
+	"github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview"
 )
 
 func main() {
@@ -28,6 +29,7 @@ func main() {
 		"0.0.1",
 		sdk.WithDeploymentPlugin(&deployment.Plugin{}),
 		sdk.WithLivestatePlugin(&livestate.Plugin{}),
+		sdk.WithPlanPreviewPlugin(&planpreview.Plugin{}),
 	)
 	if err != nil {
 		log.Fatalln(err)
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin.go b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin.go
new file mode 100644
index 0000000000..1dfe936a03
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin.go
@@ -0,0 +1,203 @@
+// Copyright 2025 The PipeCD 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 planpreview
+
+import (
+	"context"
+	"fmt"
+
+	sdk "github.com/pipe-cd/piped-plugin-sdk-go"
+	"github.com/pipe-cd/piped-plugin-sdk-go/diff"
+
+	kubeconfig "github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/config"
+	"github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/provider"
+	"github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/toolregistry"
+)
+
+var (
+	_ sdk.PlanPreviewPlugin[sdk.ConfigNone, kubeconfig.KubernetesDeployTargetConfig, kubeconfig.KubernetesApplicationSpec] = (*Plugin)(nil)
+)
+
+// Plugin implements the sdk.PlanPreviewPlugin interface for the kubernetes_multicluster plugin.
+type Plugin struct{}
+
+// GetPlanPreview returns the plan preview result showing what will change across all deploy targets.
+func (p *Plugin) GetPlanPreview(ctx context.Context, _ *sdk.ConfigNone, dts []*sdk.DeployTarget[kubeconfig.KubernetesDeployTargetConfig], input *sdk.GetPlanPreviewInput[kubeconfig.KubernetesApplicationSpec]) (*sdk.GetPlanPreviewResponse, error) {
+	toolRegistry := toolregistry.NewRegistry(input.Client.ToolRegistry())
+	loader := provider.NewLoader(toolRegistry)
+
+	targetDS := input.Request.TargetDeploymentSource
+	targetAppCfg, err := targetDS.AppConfig()
+	if err != nil {
+		return nil, err
+	}
+	targetSpec := targetAppCfg.Spec
+
+	runningDS := input.Request.RunningDeploymentSource
+
+	multiTargets := targetSpec.Input.MultiTargets
+
+	// Single-target fallback: no multiTargets configured — load manifests once and return one result.
+	if len(multiTargets) == 0 {
+		newManifests, err := loadManifests(ctx, loader, input, &targetDS, targetSpec, nil)
+		if err != nil {
+			return nil, err
+		}
+
+		var oldManifests []provider.Manifest
+		if runningDS.CommitHash != "" {
+			runningAppCfg, err := runningDS.AppConfig()
+			if err != nil {
+				return nil, err
+			}
+			oldManifests, err = loadManifests(ctx, loader, input, &runningDS, runningAppCfg.Spec, nil)
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		result, err := provider.DiffList(
+			oldManifests,
+			newManifests,
+			input.Logger,
+			diff.WithEquateEmpty(),
+			diff.WithCompareNumberAndNumericString(),
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		deployTargetName := ""
+		if len(dts) > 0 {
+			deployTargetName = dts[0].Name
+		}
+		return &sdk.GetPlanPreviewResponse{
+			Results: []sdk.PlanPreviewResult{toResult(result, deployTargetName)},
+		}, nil
+	}
+
+	// Multi-target: produce one PlanPreviewResult per deploy target.
+	results := make([]sdk.PlanPreviewResult, 0, len(dts))
+	for _, dt := range dts {
+		// Find the matching KubernetesMultiTarget config for this deploy target.
+		var mt *kubeconfig.KubernetesMultiTarget
+		for i := range multiTargets {
+			if multiTargets[i].Target.Name == dt.Name {
+				mt = &multiTargets[i]
+				break
+			}
+		}
+
+		newManifests, err := loadManifests(ctx, loader, input, &targetDS, targetSpec, mt)
+		if err != nil {
+			results = append(results, sdk.PlanPreviewResult{
+				DeployTarget: dt.Name,
+				NoChange:     false,
+				Summary:      fmt.Sprintf("Failed to load target manifests: %v", err),
+				DiffLanguage: "diff",
+			})
+			continue
+		}
+
+		var oldManifests []provider.Manifest
+		if runningDS.CommitHash != "" {
+			runningAppCfg, err := runningDS.AppConfig()
+			if err != nil {
+				return nil, err
+			}
+			oldManifests, err = loadManifests(ctx, loader, input, &runningDS, runningAppCfg.Spec, mt)
+			if err != nil {
+				results = append(results, sdk.PlanPreviewResult{
+					DeployTarget: dt.Name,
+					NoChange:     false,
+					Summary:      fmt.Sprintf("Failed to load running manifests: %v", err),
+					DiffLanguage: "diff",
+				})
+				continue
+			}
+		}
+
+		result, err := provider.DiffList(
+			oldManifests,
+			newManifests,
+			input.Logger,
+			diff.WithEquateEmpty(),
+			diff.WithCompareNumberAndNumericString(),
+		)
+		if err != nil {
+			results = append(results, sdk.PlanPreviewResult{
+				DeployTarget: dt.Name,
+				NoChange:     false,
+				Summary:      fmt.Sprintf("Failed to diff manifests: %v", err),
+				DiffLanguage: "diff",
+			})
+			continue
+		}
+
+		results = append(results, toResult(result, dt.Name))
+	}
+
+	return &sdk.GetPlanPreviewResponse{Results: results}, nil
+}
+
+// loadManifests loads manifests from the given deployment source, optionally overriding
+// the manifest paths from the multiTarget config.
+func loadManifests(ctx context.Context, loader *provider.Loader, input *sdk.GetPlanPreviewInput[kubeconfig.KubernetesApplicationSpec], ds *sdk.DeploymentSource[kubeconfig.KubernetesApplicationSpec], spec *kubeconfig.KubernetesApplicationSpec, mt *kubeconfig.KubernetesMultiTarget) ([]provider.Manifest, error) {
+	manifestPaths := spec.Input.Manifests
+	if mt != nil && len(mt.Manifests) > 0 {
+		manifestPaths = mt.Manifests
+	}
+
+	return loader.LoadManifests(ctx, provider.LoaderInput{
+		PipedID:          input.Request.PipedID,
+		AppID:            input.Request.ApplicationID,
+		CommitHash:       ds.CommitHash,
+		AppName:          input.Request.ApplicationName,
+		AppDir:           ds.ApplicationDirectory,
+		ConfigFilename:   ds.ApplicationConfigFilename,
+		Manifests:        manifestPaths,
+		Namespace:        spec.Input.Namespace,
+		KustomizeVersion: spec.Input.KustomizeVersion,
+		KustomizeOptions: spec.Input.KustomizeOptions,
+		HelmVersion:      spec.Input.HelmVersion,
+		HelmChart:        spec.Input.HelmChart,
+		HelmOptions:      spec.Input.HelmOptions,
+		Logger:           input.Logger,
+	})
+}
+
+// toResult converts a DiffListResult into a PlanPreviewResult for the given deploy target.
+func toResult(result *provider.DiffListResult, deployTarget string) sdk.PlanPreviewResult {
+	if result.NoChanges() {
+		return sdk.PlanPreviewResult{
+			DeployTarget: deployTarget,
+			NoChange:     true,
+			Summary:      "No changes were detected",
+			DiffLanguage: "diff",
+		}
+	}
+
+	details := result.Render(provider.DiffRenderOptions{
+		MaskSecret: true,
+	})
+
+	return sdk.PlanPreviewResult{
+		DeployTarget: deployTarget,
+		NoChange:     false,
+		Summary:      fmt.Sprintf("%d added manifests, %d changed manifests, %d deleted manifests", len(result.Adds), len(result.Changes), len(result.Deletes)),
+		DiffLanguage: "diff",
+		Details:      []byte(details),
+	}
+}
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin_test.go b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin_test.go
new file mode 100644
index 0000000000..9372df6fc2
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/plugin_test.go
@@ -0,0 +1,230 @@
+// Copyright 2025 The PipeCD 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 planpreview
+
+import (
+	"context"
+	"path/filepath"
+	"testing"
+
+	sdk "github.com/pipe-cd/piped-plugin-sdk-go"
+	"github.com/pipe-cd/piped-plugin-sdk-go/logpersister/logpersistertest"
+	"github.com/pipe-cd/piped-plugin-sdk-go/toolregistry/toolregistrytest"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"go.uber.org/zap/zaptest"
+
+	kubeconfig "github.com/pipe-cd/pipecd/pkg/app/pipedv1/plugin/kubernetes_multicluster/config"
+)
+
+const (
+	pluginName    = "kubernetes_multicluster"
+	runningCommit = "abc000"
+	targetCommit  = "abc123"
+)
+
+func makeDeployTargets(names ...string) []*sdk.DeployTarget[kubeconfig.KubernetesDeployTargetConfig] {
+	dts := make([]*sdk.DeployTarget[kubeconfig.KubernetesDeployTargetConfig], 0, len(names))
+	for _, name := range names {
+		dts = append(dts, &sdk.DeployTarget[kubeconfig.KubernetesDeployTargetConfig]{Name: name})
+	}
+	return dts
+}
+
+func makeInput(
+	t *testing.T,
+	appConfigFile string,
+	targetAppDir string,
+	runningAppDir string,
+) *sdk.GetPlanPreviewInput[kubeconfig.KubernetesApplicationSpec] {
+	t.Helper()
+
+	appCfg := sdk.LoadApplicationConfigForTest[kubeconfig.KubernetesApplicationSpec](t, appConfigFile, pluginName)
+	testRegistry := toolregistrytest.NewTestToolRegistry(t)
+
+	targetDS := sdk.DeploymentSource[kubeconfig.KubernetesApplicationSpec]{
+		ApplicationDirectory:      targetAppDir,
+		CommitHash:                targetCommit,
+		ApplicationConfig:         appCfg,
+		ApplicationConfigFilename: "app.pipecd.yaml",
+	}
+
+	input := &sdk.GetPlanPreviewInput[kubeconfig.KubernetesApplicationSpec]{
+		Request: sdk.GetPlanPreviewRequest[kubeconfig.KubernetesApplicationSpec]{
+			ApplicationID:          "app-id",
+			ApplicationName:        "simple",
+			TargetDeploymentSource: targetDS,
+		},
+		Client: sdk.NewClient(nil, pluginName, "app-id", "", logpersistertest.NewTestLogPersister(t), testRegistry),
+		Logger: zaptest.NewLogger(t),
+	}
+
+	if runningAppDir != "" {
+		input.Request.RunningDeploymentSource = sdk.DeploymentSource[kubeconfig.KubernetesApplicationSpec]{
+			ApplicationDirectory:      runningAppDir,
+			CommitHash:                runningCommit,
+			ApplicationConfig:         appCfg,
+			ApplicationConfigFilename: "app.pipecd.yaml",
+		}
+	}
+
+	return input
+}
+
+func TestPlugin_GetPlanPreview_SingleTarget(t *testing.T) {
+	t.Parallel()
+
+	appCfgFile := filepath.Join("testdata", "single", "app.pipecd.yaml")
+	runningDir := filepath.Join("testdata", "single", "running")
+	targetDir := filepath.Join("testdata", "single", "target")
+	p := &Plugin{}
+
+	tests := []struct {
+		name          string
+		targetDir     string
+		runningDir    string
+		wantNoChange  bool
+		wantSummary   string
+		wantInDetails []string
+	}{
+		{
+			name:         "first deployment (no running source)",
+			targetDir:    targetDir,
+			runningDir:   "",
+			wantNoChange: false,
+			wantSummary:  "1 added manifests, 0 changed manifests, 0 deleted manifests",
+			wantInDetails: []string{
+				"simple",
+				"Deployment",
+			},
+		},
+		{
+			name:         "no change (same files)",
+			targetDir:    runningDir,
+			runningDir:   runningDir,
+			wantNoChange: true,
+			wantSummary:  "No changes were detected",
+		},
+		{
+			name:         "image tag changed",
+			targetDir:    targetDir,
+			runningDir:   runningDir,
+			wantNoChange: false,
+			wantSummary:  "0 added manifests, 1 changed manifests, 0 deleted manifests",
+			wantInDetails: []string{
+				"v0.1.0",
+				"v0.2.0",
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			input := makeInput(t, appCfgFile, tc.targetDir, tc.runningDir)
+
+			resp, err := p.GetPlanPreview(context.Background(), nil, makeDeployTargets("default"), input)
+			require.NoError(t, err)
+			require.Len(t, resp.Results, 1)
+
+			result := resp.Results[0]
+			assert.Equal(t, tc.wantNoChange, result.NoChange)
+			assert.Equal(t, tc.wantSummary, result.Summary)
+			assert.Equal(t, "diff", result.DiffLanguage)
+
+			for _, s := range tc.wantInDetails {
+				assert.Contains(t, string(result.Details), s)
+			}
+			if tc.wantNoChange {
+				assert.Nil(t, result.Details)
+			}
+		})
+	}
+}
+
+func TestPlugin_GetPlanPreview_MultiTarget(t *testing.T) {
+	t.Parallel()
+
+	appCfgFile := filepath.Join("testdata", "multi", "app.pipecd.yaml")
+	runningDir := filepath.Join("testdata", "multi", "running")
+	targetDir := filepath.Join("testdata", "multi", "target")
+	p := &Plugin{}
+	dts := makeDeployTargets("cluster1", "cluster2")
+
+	tests := []struct {
+		name   string
+		checks []struct {
+			deployTarget  string
+			wantNoChange  bool
+			wantSummary   string
+			wantInDetails []string
+		}
+	}{
+		{
+			name: "cluster1 changed, cluster2 unchanged",
+			checks: []struct {
+				deployTarget  string
+				wantNoChange  bool
+				wantSummary   string
+				wantInDetails []string
+			}{
+				{
+					deployTarget:  "cluster1",
+					wantNoChange:  false,
+					wantSummary:   "0 added manifests, 1 changed manifests, 0 deleted manifests",
+					wantInDetails: []string{"v0.1.0", "v0.2.0"},
+				},
+				{
+					deployTarget: "cluster2",
+					wantNoChange: true,
+					wantSummary:  "No changes were detected",
+				},
+			},
+		},
+	}
+
+	for _, tc := range tests {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			input := makeInput(t, appCfgFile, targetDir, runningDir)
+
+			resp, err := p.GetPlanPreview(context.Background(), nil, dts, input)
+			require.NoError(t, err)
+			require.Len(t, resp.Results, 2)
+
+			for _, check := range tc.checks {
+				var result *sdk.PlanPreviewResult
+				for i := range resp.Results {
+					if resp.Results[i].DeployTarget == check.deployTarget {
+						result = &resp.Results[i]
+						break
+					}
+				}
+				require.NotNil(t, result, "result for deploy target %q not found", check.deployTarget)
+
+				assert.Equal(t, check.wantNoChange, result.NoChange)
+				assert.Equal(t, check.wantSummary, result.Summary)
+				assert.Equal(t, "diff", result.DiffLanguage)
+
+				for _, s := range check.wantInDetails {
+					assert.Contains(t, string(result.Details), s)
+				}
+				if check.wantNoChange {
+					assert.Nil(t, result.Details)
+				}
+			}
+		})
+	}
+}
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/app.pipecd.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/app.pipecd.yaml
new file mode 100644
index 0000000000..1c276ff724
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/app.pipecd.yaml
@@ -0,0 +1,16 @@
+apiVersion: pipecd.dev/v1beta1
+kind: KubernetesApp
+spec:
+  name: simple
+  plugins:
+    kubernetes_multicluster:
+      input:
+        multiTargets:
+          - target:
+              name: cluster1
+            manifests:
+              - cluster1/deployment.yaml
+          - target:
+              name: cluster2
+            manifests:
+              - cluster2/deployment.yaml
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster1/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster1/deployment.yaml
new file mode 100644
index 0000000000..948615b320
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster1/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple-cluster1
+  labels:
+    app: simple-cluster1
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple-cluster1
+  template:
+    metadata:
+      labels:
+        app: simple-cluster1
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.1.0
+        ports:
+        - containerPort: 9085
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster2/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster2/deployment.yaml
new file mode 100644
index 0000000000..7c4bf2b98a
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/running/cluster2/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple-cluster2
+  labels:
+    app: simple-cluster2
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple-cluster2
+  template:
+    metadata:
+      labels:
+        app: simple-cluster2
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.1.0
+        ports:
+        - containerPort: 9085
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster1/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster1/deployment.yaml
new file mode 100644
index 0000000000..aec2241e56
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster1/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple-cluster1
+  labels:
+    app: simple-cluster1
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple-cluster1
+  template:
+    metadata:
+      labels:
+        app: simple-cluster1
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.2.0
+        ports:
+        - containerPort: 9085
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster2/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster2/deployment.yaml
new file mode 100644
index 0000000000..7c4bf2b98a
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/multi/target/cluster2/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple-cluster2
+  labels:
+    app: simple-cluster2
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple-cluster2
+  template:
+    metadata:
+      labels:
+        app: simple-cluster2
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.1.0
+        ports:
+        - containerPort: 9085
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/app.pipecd.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/app.pipecd.yaml
new file mode 100644
index 0000000000..b17a64f39f
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/app.pipecd.yaml
@@ -0,0 +1,9 @@
+apiVersion: pipecd.dev/v1beta1
+kind: KubernetesApp
+spec:
+  name: simple
+  plugins:
+    kubernetes_multicluster:
+      input:
+        manifests:
+          - deployment.yaml
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/running/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/running/deployment.yaml
new file mode 100644
index 0000000000..6c13dc1cd7
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/running/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple
+  labels:
+    app: simple
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple
+  template:
+    metadata:
+      labels:
+        app: simple
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.1.0
+        ports:
+        - containerPort: 9085
diff --git a/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/target/deployment.yaml b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/target/deployment.yaml
new file mode 100644
index 0000000000..a55df1dfbb
--- /dev/null
+++ b/pkg/app/pipedv1/plugin/kubernetes_multicluster/planpreview/testdata/single/target/deployment.yaml
@@ -0,0 +1,21 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: simple
+  labels:
+    app: simple
+spec:
+  replicas: 2
+  selector:
+    matchLabels:
+      app: simple
+  template:
+    metadata:
+      labels:
+        app: simple
+    spec:
+      containers:
+      - name: helloworld
+        image: ghcr.io/pipe-cd/helloworld:v0.2.0
+        ports:
+        - containerPort: 9085