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diff --git a/lib/ansible/modules/assert.py b/lib/ansible/modules/assert.py
new file mode 100644
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+++ b/lib/ansible/modules/assert.py
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+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2012, Dag Wieers <dag@wieers.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import absolute_import, division, print_function
+__metaclass__ = type
+
+
+DOCUMENTATION = r'''
+---
+module: assert
+short_description: Asserts given expressions are true
+description:
+     - This module asserts that given expressions are true with an optional custom message.
+     - This module is also supported for Windows targets.
+version_added: "1.5"
+options:
+  that:
+    description:
+      - A list of string expressions of the same form that can be passed to the 'when' statement.
+    type: list
+    elements: str
+    required: true
+  fail_msg:
+    description:
+      - The customized message used for a failing assertion.
+      - This argument was called 'msg' before Ansible 2.7, now it is renamed to 'fail_msg' with alias 'msg'.
+    type: str
+    aliases: [ msg ]
+    version_added: "2.7"
+  success_msg:
+    description:
+      - The customized message used for a successful assertion.
+    type: str
+    version_added: "2.7"
+  quiet:
+    description:
+      - Set this to C(true) to avoid verbose output.
+    type: bool
+    default: no
+    version_added: "2.8"
+extends_documentation_fragment:
+  - action_common_attributes
+  - action_common_attributes.conn
+  - action_common_attributes.flow
+attributes:
+    action:
+        support: full
+    async:
+        support: none
+    become:
+        support: none
+    bypass_host_loop:
+        support: none
+    connection:
+        support: none
+    check_mode:
+        support: full
+    delegation:
+        support: none
+        details: Aside from C(register) and/or in combination with C(delegate_facts), it has little effect.
+    diff_mode:
+        support: none
+    platform:
+        platforms: all
+seealso:
+- module: ansible.builtin.debug
+- module: ansible.builtin.fail
+- module: ansible.builtin.meta
+author:
+    - Ansible Core Team
+    - Michael DeHaan
+'''
+
+EXAMPLES = r'''
+- ansible.builtin.assert: { that: "ansible_os_family != 'RedHat'" }
+
+- ansible.builtin.assert:
+    that:
+      - "'foo' in some_command_result.stdout"
+      - number_of_the_counting == 3
+
+- name: After version 2.7 both 'msg' and 'fail_msg' can customize failing assertion message
+  ansible.builtin.assert:
+    that:
+      - my_param <= 100
+      - my_param >= 0
+    fail_msg: "'my_param' must be between 0 and 100"
+    success_msg: "'my_param' is between 0 and 100"
+
+- name: Please use 'msg' when ansible version is smaller than 2.7
+  ansible.builtin.assert:
+    that:
+      - my_param <= 100
+      - my_param >= 0
+    msg: "'my_param' must be between 0 and 100"
+
+- name: Use quiet to avoid verbose output
+  ansible.builtin.assert:
+    that:
+      - my_param <= 100
+      - my_param >= 0
+    quiet: true
+'''