test simple generateName metadata behavior

fix issue number

api/krusty/generatename_test.go

@@ -0,0 +1,54 @@
+// Copyright 2019 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package krusty_test
+
+import (
+	"testing"
+
+	kusttest_test "sigs.k8s.io/kustomize/api/testutils/kusttest"
+)
+
+// Coverage for issue #641
+func TestGenerateName(t *testing.T) {
+	th := kusttest_test.MakeHarness(t)
+
+	th.WriteK(".", `
+resources:
+- job.yaml
+namePrefix: pre-
+nameSuffix: -post
+`)
+	th.WriteF("job.yaml", `
+apiVersion: batch/v1
+kind: Job
+metadata:
+  generateName: job-
+spec:
+  template:
+    spec:
+      containers:
+      - name: job
+        image: run/job:1.0
+        command:
+        - echo
+        - done
+`)
+
+	m := th.Run(".", th.MakeDefaultOptions())
+	th.AssertActualEqualsExpected(m, `
+apiVersion: batch/v1
+kind: Job
+metadata:
+  generateName: job-
+spec:
+  template:
+    spec:
+      containers:
+      - command:
+        - echo
+        - done
+        image: run/job:1.0
+        name: job
+`)
+}