dig: Fix evaluation of boolean parameters (#5129) (#5137)

* Add lookup_dig tests

* Fix boolean evaluation

* Add changelog fragment

* Apply review changes

* Add license

(cherry picked from commit 3c2d7eb193)

Co-authored-by: Michal Hybner <76526074+mu1f407@users.noreply.github.com>

tests/integration/targets/lookup_dig/aliases

@@ -0,0 +1,6 @@
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+shippable/posix/group1
+skip/python2.6  # lookups are controller only, and we no longer support Python 2.6 on the controller

tests/integration/targets/lookup_dig/meta/main.yml

@@ -0,0 +1,7 @@
+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dependencies:
+  - setup_remote_constraints

tests/integration/targets/lookup_dig/tasks/main.yml

@@ -0,0 +1,37 @@
+---
+####################################################################
+# WARNING: These are designed specifically for Ansible tests       #
+# and should not be used as examples of how to write Ansible roles #
+####################################################################
+
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+- name: Install dnspython library
+  pip:
+    name: dnspython
+    state: present
+    extra_args: "-c {{ remote_constraints }}"
+
+- name: Test dig lookup with existing domain
+  set_fact:
+    dig_existing: "{{ lookup('community.general.dig', 'github.com.') }}"
+
+- name: Test dig lookup with non-existing domain and fail_on_error=no
+  set_fact:
+    dig_nonexisting_fail_no: "{{ lookup('community.general.dig', 'non-existing.domain.', 'fail_on_error=no') }}"
+
+- name: Verify that NXDOMAIN was returned
+  assert:
+    that: dig_nonexisting_fail_no == 'NXDOMAIN'
+
+- name: Test dig lookup with non-existing domain and fail_on_error=yes
+  set_fact:
+    dig_nonexisting_fail_yes: "{{ lookup('community.general.dig', 'non-existing.domain.', 'fail_on_error=yes') }}"
+  ignore_errors: yes
+  register: dig_nonexisting_fail_yes_result
+
+- name: Verify that the task failed
+  assert:
+    that: dig_nonexisting_fail_yes_result is failed