add unit test and address comments

pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml

@@ -1,4 +1,4 @@
-namePrefix: com1-
+namePrefix: p1-
 configMapGenerator:
 - name: com1
   behavior: create

pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml

@@ -1,6 +1,6 @@
-namePrefix: com2-
+namePrefix: p2-
 configMapGenerator:
 - name: com2
   behavior: create
   literals:
-    - from=base
+    - from=base

pkg/commands/testdata/testcase-configmaps/expected.diff

@@ -12,5 +12,5 @@ diff -u -N /tmp/noop/v1_ConfigMap_com1.yaml /tmp/transformed/v1_ConfigMap_com1.y
    annotations: {}
    creationTimestamp: null
    labels: {}
--  name: com1-com1-8mk424df76
-+  name: com1-com1-687g9gmkdf
+-  name: p1-com1-cmdb776d5b
++  name: p1-com1-dhbbm922gd

pkg/commands/testdata/testcase-configmaps/expected.yaml

@@ -8,7 +8,7 @@ metadata:
   annotations: {}
   creationTimestamp: null
   labels: {}
-  name: com1-com1-687g9gmkdf
+  name: p1-com1-dhbbm922gd
 ---
 apiVersion: v1
 data:
@@ -18,4 +18,4 @@ metadata:
   annotations: {}
   creationTimestamp: null
   labels: {}
-  name: com2-com2-bcd85m642t
+  name: p2-com2-c4b8md75k9