diff --git a/api/krusty/generatorplugin_test.go b/api/krusty/generatorplugin_test.go
new file mode 100644
index 00000000000..68d5b3ec612
--- /dev/null
+++ b/api/krusty/generatorplugin_test.go
@@ -0,0 +1,132 @@
+package krusty_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+	"sigs.k8s.io/kustomize/kyaml/filesys"
+)
+
+func TestGeneratorHashSuffixWithMergeBehavior(t *testing.T) {
+	fSys := filesys.MakeFsOnDisk()
+	generatorFilename := "generateWithHashRequest.sh"
+
+	th := kusttest_test.MakeHarnessWithFs(t, fSys)
+	o := th.MakeOptionsPluginsEnabled()
+	o.PluginConfig.FnpLoadingOptions.EnableExec = true
+
+	tmpDir, err := filesys.NewTmpConfirmedDir()
+	assert.NoError(t, err)
+	th.WriteK(tmpDir.String(), `
+resources: 
+- configmap.yaml
+generators:
+- |-
+  kind: Executable
+  metadata:
+    name: demo
+    annotations:
+      config.kubernetes.io/function: |
+        exec:
+          path: ./`+generatorFilename+`
+`)
+
+	th.WriteF(filepath.Join(tmpDir.String(), "configmap.yaml"), `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cmap
+data:
+  a: b
+`)
+	th.WriteF(filepath.Join(tmpDir.String(), generatorFilename), `#!/bin/sh
+
+cat <<EOF
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cmap
+  annotations:
+    kustomize.config.k8s.io/needs-hash: "true"
+    kustomize.config.k8s.io/behavior: "merge"
+data:
+  c: d
+EOF
+`)
+	assert.NoError(t, os.Chmod(filepath.Join(tmpDir.String(), generatorFilename), 0777))
+	m := th.Run(tmpDir.String(), o)
+	assert.NoError(t, err)
+	yml, err := m.AsYaml()
+	assert.NoError(t, err)
+	assert.Equal(t, `apiVersion: v1
+data:
+  a: b
+  c: d
+kind: ConfigMap
+metadata:
+  name: cmap-fh478f99mk
+`, string(yml))
+}
+
+func TestGeneratorHashSuffixWithReplaceBehavior(t *testing.T) {
+	fSys := filesys.MakeFsOnDisk()
+	generatorFilename := "generateWithHashRequest.sh"
+
+	th := kusttest_test.MakeHarnessWithFs(t, fSys)
+	o := th.MakeOptionsPluginsEnabled()
+	o.PluginConfig.FnpLoadingOptions.EnableExec = true
+
+	tmpDir, err := filesys.NewTmpConfirmedDir()
+	assert.NoError(t, err)
+	th.WriteK(tmpDir.String(), `
+resources: 
+- configmap.yaml
+generators:
+- |-
+  kind: Executable
+  metadata:
+    name: demo
+    annotations:
+      config.kubernetes.io/function: |
+        exec:
+          path: ./`+generatorFilename+`
+`)
+
+	th.WriteF(filepath.Join(tmpDir.String(), "configmap.yaml"), `
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cmap
+data:
+  a: b
+`)
+	th.WriteF(filepath.Join(tmpDir.String(), generatorFilename), `#!/bin/sh
+
+cat <<EOF
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: cmap
+  annotations:
+    kustomize.config.k8s.io/needs-hash: "true"
+    kustomize.config.k8s.io/behavior: "replace"
+data:
+  c: d
+EOF
+`)
+	assert.NoError(t, os.Chmod(filepath.Join(tmpDir.String(), generatorFilename), 0777))
+	m := th.Run(tmpDir.String(), o)
+	assert.NoError(t, err)
+	yml, err := m.AsYaml()
+	assert.NoError(t, err)
+	assert.Equal(t, `apiVersion: v1
+data:
+  c: d
+kind: ConfigMap
+metadata:
+  name: cmap-gbdtcf54mt
+`, string(yml))
+}