Integration tests for invalid group name.

test/integration/targets/inventory-invalid-group/aliases

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+shippable/posix/group5
+context/controller

test/integration/targets/inventory-invalid-group/inventory.ini

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+[local-]
+testhost ansible_connection=local
+
+[all:vars]
+ansible_python_interpreter="{{ ansible_playbook_python }}"

test/integration/targets/inventory-invalid-group/runme.sh

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+#!/usr/bin/env bash
+
+set -eux
+set -o pipefail
+
+command=(ansible-playbook -v -i inventory.ini test.yml)
+ never='Invalid characters were found in group names but not replaced'
+always='Invalid characters were found in group names and automatically'
+
+ANSIBLE_TRANSFORM_INVALID_GROUP_CHARS=never    "${command[@]}" -l "local-" 2>&1 | grep -c  -e "${never}"
+ANSIBLE_TRANSFORM_INVALID_GROUP_CHARS=always   "${command[@]}" -l "local_" 2>&1 | grep -c  -e "${always}"
+ANSIBLE_TRANSFORM_INVALID_GROUP_CHARS=ignore   "${command[@]}" -l "local-" 2>&1 | grep -cv -e "${never}" -e "${always}"
+ANSIBLE_TRANSFORM_INVALID_GROUP_CHARS=silently "${command[@]}" -l "local_" 2>&1 | grep -cv -e "${never}" -e "${always}"

test/integration/targets/inventory-invalid-group/test.yml

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+- hosts: testhost
+  gather_facts: no
+  tasks: []