diff --git a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
new file mode 100644
index 000000000..a1dafe5fb
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
@@ -0,0 +1,6 @@
+namePrefix: com1-
+configMapGenerator:
+- name: com1
+  behavior: create
+  literals:
+    - from=base
diff --git a/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
new file mode 100644
index 000000000..2228e5053
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
@@ -0,0 +1,6 @@
+namePrefix: com2-
+configMapGenerator:
+- name: com2
+  behavior: create
+  literals:
+    - from=base
\ No newline at end of file
diff --git a/pkg/commands/testdata/testcase-configmaps/expected.diff b/pkg/commands/testdata/testcase-configmaps/expected.diff
new file mode 100644
index 000000000..d47a3ee21
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/expected.diff
@@ -0,0 +1,16 @@
+diff -u -N /tmp/noop/v1_ConfigMap_com1.yaml /tmp/transformed/v1_ConfigMap_com1.yaml
+--- /tmp/noop/v1_ConfigMap_com1.yaml	YYYY-MM-DD HH:MM:SS
++++ /tmp/transformed/v1_ConfigMap_com1.yaml	YYYY-MM-DD HH:MM:SS
+@@ -1,9 +1,11 @@
+ apiVersion: v1
+ data:
++  baz: qux
++  foo: bar
+   from: overlay
+ kind: ConfigMap
+ metadata:
+   annotations: {}
+   creationTimestamp: null
+   labels: {}
+-  name: com1-com1-8mk424df76
++  name: com1-com1-687g9gmkdf
diff --git a/pkg/commands/testdata/testcase-configmaps/expected.yaml b/pkg/commands/testdata/testcase-configmaps/expected.yaml
new file mode 100644
index 000000000..ed24ea891
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/expected.yaml
@@ -0,0 +1,21 @@
+apiVersion: v1
+data:
+  baz: qux
+  foo: bar
+  from: overlay
+kind: ConfigMap
+metadata:
+  annotations: {}
+  creationTimestamp: null
+  labels: {}
+  name: com1-com1-687g9gmkdf
+---
+apiVersion: v1
+data:
+  from: overlay
+kind: ConfigMap
+metadata:
+  annotations: {}
+  creationTimestamp: null
+  labels: {}
+  name: com2-com2-bcd85m642t
diff --git a/pkg/commands/testdata/testcase-configmaps/overlay/dev/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/overlay/dev/kustomization.yaml
new file mode 100644
index 000000000..1ccbeefb7
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/overlay/dev/kustomization.yaml
@@ -0,0 +1,9 @@
+bases:
+- myapp/mycomponent
+- myapp/mycomponent2
+configMapGenerator:
+- name: com1
+  behavior: merge
+  literals:
+    - foo=bar
+    - baz=qux
\ No newline at end of file
diff --git a/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml
new file mode 100644
index 000000000..0ff7d2083
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml
@@ -0,0 +1,7 @@
+bases:
+- ../../../../base/myapp/mycomponent
+configMapGenerator:
+- name: com1
+  behavior: merge
+  literals:
+    - from=overlay
diff --git a/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml b/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml
new file mode 100644
index 000000000..45d1eedd1
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml
@@ -0,0 +1,7 @@
+bases:
+- ../../../../base/myapp/mycomponent2
+configMapGenerator:
+- name: com2
+  behavior: merge
+  literals:
+    - from=overlay
diff --git a/pkg/commands/testdata/testcase-configmaps/test.yaml b/pkg/commands/testdata/testcase-configmaps/test.yaml
new file mode 100644
index 000000000..633d415a7
--- /dev/null
+++ b/pkg/commands/testdata/testcase-configmaps/test.yaml
@@ -0,0 +1,5 @@
+description: configmap generator overlay
+args: []
+filename: testdata/testcase-configmaps/overlay/dev
+expectedStdout: testdata/testcase-configmaps/expected.yaml
+expectedDiff: testdata/testcase-configmaps/expected.diff