Update readme and add module tests

tests/modules/net_lb_ext/defaults.tfvars

@@ -0,0 +1,7 @@
+project_id = "my-project"
+region     = "europe-west1"
+name       = "nlb-test"
+backends = [{
+  group    = "foo"
+  failover = false
+}]

tests/modules/net_lb_ext/defaults.yaml

@@ -0,0 +1,46 @@
+# Copyright 2023 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.
+
+values:
+  google_compute_forwarding_rule.forwarding_rules[""]:
+    all_ports: true
+    ip_protocol: TCP
+    labels: null
+    load_balancing_scheme: EXTERNAL
+    name: nlb-test
+    project: my-project
+    region: europe-west1
+  google_compute_region_backend_service.default:
+    backend:
+    - balancing_mode: CONNECTION
+      capacity_scaler: null
+      description: Terraform managed.
+      failover: false
+      group: foo
+      max_connections: null
+      max_connections_per_endpoint: null
+      max_connections_per_instance: null
+      max_rate: null
+      max_rate_per_endpoint: null
+      max_rate_per_instance: null
+      max_utilization: null
+    load_balancing_scheme: EXTERNAL
+    name: nlb-test
+    project: my-project
+    protocol: UNSPECIFIED
+    region: europe-west1
+
+counts:
+  google_compute_forwarding_rule: 1
+  google_compute_region_backend_service: 1

tests/modules/net_lb_ext/dual-stack.tfvars

@@ -0,0 +1,15 @@
+project_id = "my-project"
+region     = "europe-west1"
+name       = "nlb-test"
+backends = [{
+  group    = "foo"
+  failover = false
+}]
+forwarding_rules_config = {
+  ipv4 = {
+    ip_version = "IPV4"
+  }
+  ipv6 = {
+    ip_version = "IPV6"
+  }
+}

tests/modules/net_lb_ext/dual-stack.yaml

@@ -0,0 +1,23 @@
+# Copyright 2023 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.
+
+values:
+  google_compute_forwarding_rule.forwarding_rules["ipv4"]:
+    ip_version: "IPV4"
+  google_compute_forwarding_rule.forwarding_rules["ipv6"]:
+    ip_version: "IPV6"
+
+counts:
+  google_compute_forwarding_rule: 2
+  google_compute_region_backend_service: 1

tests/modules/net_lb_ext/forwarding-rule.tfvars

@@ -0,0 +1,13 @@
+project_id = "my-project"
+region     = "europe-west1"
+name       = "nlb-test"
+backends = [{
+  group    = "foo"
+  failover = false
+}]
+forwarding_rules_config = {
+  "port-80" = {
+    ports = [80]
+  }
+}
+

tests/modules/net_lb_ext/forwarding-rule.yaml

@@ -0,0 +1,23 @@
+# Copyright 2023 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.
+
+values:
+  google_compute_forwarding_rule.forwarding_rules["port-80"]:
+    all_ports: null
+    ports:
+    - '80'
+
+counts:
+  google_compute_forwarding_rule: 1
+  google_compute_region_backend_service: 1

tests/modules/net_lb_ext/tftest.yaml

@@ -0,0 +1,20 @@
+# Copyright 2023 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: modules/net-lb-ext
+
+tests:
+  defaults:
+  dual-stack:
+  forwarding-rule: