diff --git a/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml b/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
deleted file mode 100644
index fe386b14b..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent/kustomization.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
-apiVersion: v1beta1
-kind: Kustomization
-namePrefix: p1-
-configMapGenerator:
-- name: com1
-  behavior: create
-  literals:
-    - from=base
diff --git a/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml b/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
deleted file mode 100644
index 18b0347bb..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/base/myapp/mycomponent2/kustomization.yaml
+++ /dev/null
@@ -1,8 +0,0 @@
-apiVersion: v1beta1
-kind: Kustomization
-namePrefix: p2-
-configMapGenerator:
-- name: com2
-  behavior: create
-  literals:
-    - from=base
diff --git a/pkg/commands/build/testdata/testcase-configmaps/expected.diff b/pkg/commands/build/testdata/testcase-configmaps/expected.diff
deleted file mode 100644
index 7803718cb..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/expected.diff
+++ /dev/null
@@ -1,16 +0,0 @@
-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: p1-com1-cmdb776d5b
-+  name: p1-com1-dhbbm922gd
diff --git a/pkg/commands/build/testdata/testcase-configmaps/expected.yaml b/pkg/commands/build/testdata/testcase-configmaps/expected.yaml
deleted file mode 100644
index 59656f4ee..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/expected.yaml
+++ /dev/null
@@ -1,19 +0,0 @@
-apiVersion: v1
-data:
-  baz: qux
-  foo: bar
-  from: overlay
-kind: ConfigMap
-metadata:
-  annotations: {}
-  labels: {}
-  name: p1-com1-dhbbm922gd
----
-apiVersion: v1
-data:
-  from: overlay
-kind: ConfigMap
-metadata:
-  annotations: {}
-  labels: {}
-  name: p2-com2-c4b8md75k9
diff --git a/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/kustomization.yaml b/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/kustomization.yaml
deleted file mode 100644
index e34a4767b..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/kustomization.yaml
+++ /dev/null
@@ -1,11 +0,0 @@
-apiVersion: v1beta1
-kind: Kustomization
-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/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml b/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml
deleted file mode 100644
index f14834eab..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent/kustomization.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-apiVersion: v1beta1
-kind: Kustomization
-bases:
-- ../../../../base/myapp/mycomponent
-configMapGenerator:
-- name: com1
-  behavior: merge
-  literals:
-    - from=overlay
diff --git a/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml b/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml
deleted file mode 100644
index f66340c38..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/overlay/dev/myapp/mycomponent2/kustomization.yaml
+++ /dev/null
@@ -1,9 +0,0 @@
-apiVersion: v1beta1
-kind: Kustomization
-bases:
-- ../../../../base/myapp/mycomponent2
-configMapGenerator:
-- name: com2
-  behavior: merge
-  literals:
-    - from=overlay
diff --git a/pkg/commands/build/testdata/testcase-configmaps/test.yaml b/pkg/commands/build/testdata/testcase-configmaps/test.yaml
deleted file mode 100644
index 633d415a7..000000000
--- a/pkg/commands/build/testdata/testcase-configmaps/test.yaml
+++ /dev/null
@@ -1,5 +0,0 @@
-description: configmap generator overlay
-args: []
-filename: testdata/testcase-configmaps/overlay/dev
-expectedStdout: testdata/testcase-configmaps/expected.yaml
-expectedDiff: testdata/testcase-configmaps/expected.diff
diff --git a/pkg/target/configmaps_test.go b/pkg/target/configmaps_test.go
new file mode 100644
index 000000000..4de2ae326
--- /dev/null
+++ b/pkg/target/configmaps_test.go
@@ -0,0 +1,105 @@
+/*
+Copyright 2018 The Kubernetes 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 target
+
+import (
+	"testing"
+)
+
+func TestGenerator1(t *testing.T) {
+	th := NewKustTestHarness(t, "/app/overlay")
+	th.writeK("/app/base1", `
+apiVersion: v1beta1
+kind: Kustomization
+namePrefix: p1-
+configMapGenerator:
+- name: com1
+  behavior: create
+  literals:
+    - from=base
+`)
+	th.writeK("/app/base2", `
+apiVersion: v1beta1
+kind: Kustomization
+namePrefix: p2-
+configMapGenerator:
+- name: com2
+  behavior: create
+  literals:
+    - from=base
+`)
+	th.writeK("/app/overlay/o1", `
+apiVersion: v1beta1
+kind: Kustomization
+bases:
+- ../../base1
+configMapGenerator:
+- name: com1
+  behavior: merge
+  literals:
+    - from=overlay
+`)
+	th.writeK("/app/overlay/o2", `
+apiVersion: v1beta1
+kind: Kustomization
+bases:
+- ../../base2
+configMapGenerator:
+- name: com2
+  behavior: merge
+  literals:
+    - from=overlay
+`)
+	th.writeK("/app/overlay", `
+apiVersion: v1beta1
+kind: Kustomization
+bases:
+- o1
+- o2
+configMapGenerator:
+- name: com1
+  behavior: merge
+  literals:
+    - foo=bar
+    - baz=qux
+`)
+	m, err := th.makeKustTarget().MakeCustomizedResMap()
+	if err != nil {
+		t.Fatalf("Err: %v", err)
+	}
+	th.assertActualEqualsExpected(m, `
+apiVersion: v1
+data:
+  baz: qux
+  foo: bar
+  from: overlay
+kind: ConfigMap
+metadata:
+  annotations: {}
+  labels: {}
+  name: p1-com1-dhbbm922gd
+---
+apiVersion: v1
+data:
+  from: overlay
+kind: ConfigMap
+metadata:
+  annotations: {}
+  labels: {}
+  name: p2-com2-c4b8md75k9
+`)
+}