diff --git a/networking/filtering-proxy/README.md b/networking/filtering-proxy/README.md
index 5df1d0ee0..02a36fb69 100644
--- a/networking/filtering-proxy/README.md
+++ b/networking/filtering-proxy/README.md
@@ -22,11 +22,12 @@ You can optionally deploy the Squid server as [Managed Instance Group](https://c
 |---|---|:---: |:---:|:---:|
 | billing_account | Billing account id used as default for new projects. | <code title="">string</code> | ✓ |  |
 | prefix | Prefix used for resources that need unique names. | <code title="">string</code> | ✓ |  |
-| region | Default region for resources | <code title="">string</code> | ✓ |  |
 | root_node | Root node for the new hierarchy, either 'organizations/org_id' or 'folders/folder_id'. | <code title="">string</code> | ✓ |  |
+| *allowed_domains* | List of domains allowed by the squid proxy. | <code title="list&#40;string&#41;">list(string)</code> |  | <code title="&#91;&#10;&#34;.google.com&#34;,&#10;&#34;.github.com&#34;&#10;&#93;">...</code> |
 | *cidrs* | CIDR ranges for subnets | <code title="map&#40;string&#41;">map(string)</code> |  | <code title="&#123;&#10;apps  &#61; &#34;10.0.0.0&#47;24&#34;&#10;proxy &#61; &#34;10.0.1.0&#47;28&#34;&#10;&#125;">...</code> |
 | *mig* | Enables the creation of an autoscaling managed instance group of squid instances. | <code title="">bool</code> |  | <code title="">false</code> |
 | *nat_logging* | Enables Cloud NAT logging if not null, value is one of 'ERRORS_ONLY', 'TRANSLATIONS_ONLY', 'ALL'. | <code title="">string</code> |  | <code title="">ERRORS_ONLY</code> |
+| *region* | Default region for resources | <code title="">string</code> |  | <code title="">europe-west1</code> |
 
 ## Outputs
 
diff --git a/networking/filtering-proxy/main.tf b/networking/filtering-proxy/main.tf
index b36daeeca..812aa1dec 100644
--- a/networking/filtering-proxy/main.tf
+++ b/networking/filtering-proxy/main.tf
@@ -124,10 +124,8 @@ module "service-account-squid" {
 }
 
 module "cos-squid" {
-  source = "../../modules/cloud-config-container/squid"
-  allow = [
-    ".github.com",
-  ]
+  source  = "../../modules/cloud-config-container/squid"
+  allow   = var.allowed_domains
   clients = [var.cidrs.apps]
 }
 
@@ -250,7 +248,7 @@ module "folder-apps" {
 module "project-app" {
   source          = "../../modules/project"
   billing_account = var.billing_account
-  name            = "app"
+  name            = "app1"
   parent          = module.folder-apps.id
   prefix          = var.prefix
   services        = ["compute.googleapis.com"]
diff --git a/networking/filtering-proxy/variables.tf b/networking/filtering-proxy/variables.tf
index 9b66bd354..99abfb0fb 100644
--- a/networking/filtering-proxy/variables.tf
+++ b/networking/filtering-proxy/variables.tf
@@ -32,6 +32,7 @@ variable "root_node" {
 variable "region" {
   description = "Default region for resources"
   type        = string
+  default     = "europe-west1"
 }
 
 variable "cidrs" {
@@ -54,3 +55,12 @@ variable "mig" {
   type        = bool
   default     = false
 }
+
+variable "allowed_domains" {
+  description = "List of domains allowed by the squid proxy."
+  type        = list(string)
+  default = [
+    ".google.com",
+    ".github.com"
+  ]
+}
diff --git a/tests/networking/filtering_proxy/__init__.py b/tests/networking/filtering_proxy/__init__.py
new file mode 100644
index 000000000..d46dbae5e
--- /dev/null
+++ b/tests/networking/filtering_proxy/__init__.py
@@ -0,0 +1,13 @@
+# Copyright 2021 Google LLC
+#
+# 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.
diff --git a/tests/networking/filtering_proxy/fixture/main.tf b/tests/networking/filtering_proxy/fixture/main.tf
new file mode 100644
index 000000000..62451c801
--- /dev/null
+++ b/tests/networking/filtering_proxy/fixture/main.tf
@@ -0,0 +1,23 @@
+/**
+ * Copyright 2021 Google LLC
+ *
+ * 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.
+ */
+
+module "test" {
+  source          = "../../../../networking/filtering-proxy"
+  billing_account = "123456-123456-123456"
+  mig             = var.mig
+  prefix          = "fabric"
+  root_node       = "folders/123456789"
+}
diff --git a/tests/networking/filtering_proxy/fixture/variables.tf b/tests/networking/filtering_proxy/fixture/variables.tf
new file mode 100644
index 000000000..a01f36741
--- /dev/null
+++ b/tests/networking/filtering_proxy/fixture/variables.tf
@@ -0,0 +1,18 @@
+# Copyright 2021 Google LLC
+#
+# 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
+#
+#     https://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.
+
+variable "mig" {
+  type    = bool
+  default = false
+}
diff --git a/tests/networking/filtering_proxy/test_plan.py b/tests/networking/filtering_proxy/test_plan.py
new file mode 100644
index 000000000..7c92c4c0a
--- /dev/null
+++ b/tests/networking/filtering_proxy/test_plan.py
@@ -0,0 +1,31 @@
+# Copyright 2021 Google LLC
+#
+# 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.
+
+
+import os
+import pytest
+
+
+FIXTURES_DIR = os.path.join(os.path.dirname(__file__), "fixture")
+
+
+def test_resources(e2e_plan_runner):
+    "Test that plan works and the numbers of resources is as expected."
+    modules, resources = e2e_plan_runner(FIXTURES_DIR)
+    assert len(modules) == 10
+    assert len(resources) == 26
+
+    modules, resources = e2e_plan_runner(FIXTURES_DIR, mig="true")
+    assert len(modules) == 12
+    assert len(resources) == 32