Command Runner (#4476)

* initial commit, passing unit tests

* passing one very silly integration test

* multiple changes:

- updated copyright year
- cmd_runner
  - added fmt_optval
  - created specific exceptions
  - fixed bug in context class where values from module params were not
    being used for resolving cmd arguments
  - changed order of class declaration for readability purpose
- tests
  - minor improvements in integration test code
  - removed some extraneous code in msimple.yml
  - minor improvements in unit tests
  - added few missing cases to unit test

* multiple changes

cmd_runner.py

- renamed InvalidParameterName to MissingArgumentFormat
  - improved exception parameters
- added repr and str to all exceptions
- added unpacking decorator for fmt functions
- CmdRunner
  - improved parameter validation
- _CmdRunnerContext
  - Context runs must now pass named arguments
  - Simplified passing of additional arguments to module.run_command()
  - Provided multiple context variables with info about the run

Integration tests

- rename msimple.py to cmd_echo.py for clarity
- added more test cases

* cmd_runner: env update can be passed to runner

* adding runner context info to output

* added comment on OrderedDict

* wrong variable

* refactored all fmt functions into static methods of a class

Imports should be simpler now, only one object fmt, with attr access to all callables

* added unit tests for CmdRunner

* fixed sanity checks

* fixed mock imports

* added more unit tests for CmdRunner

* terminology consistency

* multiple adjustments:

- remove extraneous imports
- renamed some variables
- added wrapper around arg formatters to handle individual arg ignore_none behaviour

* removed old code commented out in test

* multiple changes:

- ensure fmt functions return list of strings
- renamed fmt parameter from `option` to `args`
- renamed fmt.mapped to fmt.as_map
- simplified fmt.as_map
- added tests for fmt.as_fixed

* more improvements in formats

* fixed sanity

* args_order can be a string (to be split())

and improved integration test

* simplified integration test

* removed overkill str() on values - run_command does that for us

* as_list makes more sense than as_str in that context

* added changelog fragment

* Update plugins/module_utils/cmd_runner.py

Co-authored-by: Felix Fontein <felix@fontein.de>

* adjusted __repr__ output for the exceptions

* added superclass object to classes

* added additional comment on the testcase sample/example

* suggestion from PR

Co-authored-by: Felix Fontein <felix@fontein.de>

changelogs/fragments/4476-cmd_runner.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - cmd_runner module util - reusable command runner with consistent argument formatting and sensible defaults (https://github.com/ansible-collections/community.general/pull/4476).

plugins/module_utils/cmd_runner.py

@@ -0,0 +1,291 @@
+# -*- coding: utf-8 -*-
+# (c) 2022, Alexei Znamensky <russoz@gmail.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
+
+from functools import wraps
+
+from ansible.module_utils.common.collections import is_sequence
+from ansible.module_utils.six import iteritems
+
+
+def _ensure_list(value):
+    return list(value) if is_sequence(value) else [value]
+
+
+def _process_as_is(rc, out, err):
+    return rc, out, err
+
+
+class CmdRunnerException(Exception):
+    pass
+
+
+class MissingArgumentFormat(CmdRunnerException):
+    def __init__(self, arg, args_order, args_formats):
+        self.args_order = args_order
+        self.arg = arg
+        self.args_formats = args_formats
+
+    def __repr__(self):
+        return "MissingArgumentFormat({0!r}, {1!r}, {2!r})".format(
+            self.arg,
+            self.args_order,
+            self.args_formats,
+        )
+
+    def __str__(self):
+        return "Cannot find format for parameter {0} {1} in: {2}".format(
+            self.arg,
+            self.args_order,
+            self.args_formats,
+        )
+
+
+class MissingArgumentValue(CmdRunnerException):
+    def __init__(self, args_order, arg):
+        self.args_order = args_order
+        self.arg = arg
+
+    def __repr__(self):
+        return "MissingArgumentValue({0!r}, {1!r})".format(
+            self.args_order,
+            self.arg,
+        )
+
+    def __str__(self):
+        return "Cannot find value for parameter {0} in {1}".format(
+            self.arg,
+            self.args_order,
+        )
+
+
+class FormatError(CmdRunnerException):
+    def __init__(self, name, value, args_formats, exc):
+        self.name = name
+        self.value = value
+        self.args_formats = args_formats
+        self.exc = exc
+        super(FormatError, self).__init__()
+
+    def __repr__(self):
+        return "FormatError({0!r}, {1!r}, {2!r}, {3!r})".format(
+            self.name,
+            self.value,
+            self.args_formats,
+            self.exc,
+        )
+
+    def __str__(self):
+        return "Failed to format parameter {0} with value {1}: {2}".format(
+            self.name,
+            self.value,
+            self.exc,
+        )
+
+
+class _ArgFormat(object):
+    def __init__(self, func, ignore_none=None):
+        self.func = func
+        self.ignore_none = ignore_none
+
+    def __call__(self, value, ctx_ignore_none):
+        ignore_none = self.ignore_none if self.ignore_none is not None else ctx_ignore_none
+        if value is None and ignore_none:
+            return []
+        f = self.func
+        return [str(x) for x in f(value)]
+
+
+class _Format(object):
+    @staticmethod
+    def as_bool(args):
+        return _ArgFormat(lambda value: _ensure_list(args) if value else [])
+
+    @staticmethod
+    def as_bool_not(args):
+        return _ArgFormat(lambda value: [] if value else _ensure_list(args), ignore_none=False)
+
+    @staticmethod
+    def as_optval(arg, ignore_none=None):
+        return _ArgFormat(lambda value: ["{0}{1}".format(arg, value)], ignore_none=ignore_none)
+
+    @staticmethod
+    def as_opt_val(arg, ignore_none=None):
+        return _ArgFormat(lambda value: [arg, value], ignore_none=ignore_none)
+
+    @staticmethod
+    def as_opt_eq_val(arg, ignore_none=None):
+        return _ArgFormat(lambda value: ["{0}={1}".format(arg, value)], ignore_none=ignore_none)
+
+    @staticmethod
+    def as_list(ignore_none=None):
+        return _ArgFormat(_ensure_list, ignore_none=ignore_none)
+
+    @staticmethod
+    def as_fixed(args):
+        return _ArgFormat(lambda value: _ensure_list(args), ignore_none=False)
+
+    @staticmethod
+    def as_func(func, ignore_none=None):
+        return _ArgFormat(func, ignore_none=ignore_none)
+
+    @staticmethod
+    def as_map(_map, default=None, ignore_none=None):
+        return _ArgFormat(lambda value: _ensure_list(_map.get(value, default)), ignore_none=ignore_none)
+
+    @staticmethod
+    def as_default_type(_type, arg="", ignore_none=None):
+        fmt = _Format
+        if _type == "dict":
+            return fmt.as_func(lambda d: ["--{0}={1}".format(*a) for a in iteritems(d)],
+                               ignore_none=ignore_none)
+        if _type == "list":
+            return fmt.as_func(lambda value: ["--{0}".format(x) for x in value], ignore_none=ignore_none)
+        if _type == "bool":
+            return fmt.as_bool("--{0}".format(arg))
+
+        return fmt.as_opt_val("--{0}".format(arg), ignore_none=ignore_none)
+
+    @staticmethod
+    def unpack_args(func):
+        @wraps(func)
+        def wrapper(v):
+            return func(*v)
+        return wrapper
+
+    @staticmethod
+    def unpack_kwargs(func):
+        @wraps(func)
+        def wrapper(v):
+            return func(**v)
+        return wrapper
+
+
+class CmdRunner(object):
+    """
+    Wrapper for ``AnsibleModule.run_command()``.
+
+    It aims to provide a reusable runner with consistent argument formatting
+    and sensible defaults.
+    """
+
+    @staticmethod
+    def _prepare_args_order(order):
+        return tuple(order) if is_sequence(order) else tuple(order.split())
+
+    def __init__(self, module, command, arg_formats=None, default_args_order=(),
+                 check_rc=False, force_lang="C", path_prefix=None, environ_update=None):
+        self.module = module
+        self.command = _ensure_list(command)
+        self.default_args_order = self._prepare_args_order(default_args_order)
+        if arg_formats is None:
+            arg_formats = {}
+        self.arg_formats = dict(arg_formats)
+        self.check_rc = check_rc
+        self.force_lang = force_lang
+        self.path_prefix = path_prefix
+        if environ_update is None:
+            environ_update = {}
+        self.environ_update = environ_update
+
+        self.command[0] = module.get_bin_path(command[0], opt_dirs=path_prefix, required=True)
+
+        for mod_param_name, spec in iteritems(module.argument_spec):
+            if mod_param_name not in self.arg_formats:
+                self.arg_formats[mod_param_name] = _Format.as_default_type(spec['type'], mod_param_name)
+
+    def context(self, args_order=None, output_process=None, ignore_value_none=True, **kwargs):
+        if output_process is None:
+            output_process = _process_as_is
+        if args_order is None:
+            args_order = self.default_args_order
+        args_order = self._prepare_args_order(args_order)
+        for p in args_order:
+            if p not in self.arg_formats:
+                raise MissingArgumentFormat(p, args_order, tuple(self.arg_formats.keys()))
+        return _CmdRunnerContext(runner=self,
+                                 args_order=args_order,
+                                 output_process=output_process,
+                                 ignore_value_none=ignore_value_none, **kwargs)
+
+    def has_arg_format(self, arg):
+        return arg in self.arg_formats
+
+
+class _CmdRunnerContext(object):
+    def __init__(self, runner, args_order, output_process, ignore_value_none, **kwargs):
+        self.runner = runner
+        self.args_order = tuple(args_order)
+        self.output_process = output_process
+        self.ignore_value_none = ignore_value_none
+        self.run_command_args = dict(kwargs)
+
+        self.environ_update = runner.environ_update
+        self.environ_update.update(self.run_command_args.get('environ_update', {}))
+        if runner.force_lang:
+            self.environ_update.update({
+                'LANGUAGE': runner.force_lang,
+                'LC_ALL': runner.force_lang,
+            })
+        self.run_command_args['environ_update'] = self.environ_update
+
+        if 'check_rc' not in self.run_command_args:
+            self.run_command_args['check_rc'] = runner.check_rc
+        self.check_rc = self.run_command_args['check_rc']
+
+        self.cmd = None
+        self.results_rc = None
+        self.results_out = None
+        self.results_err = None
+        self.results_processed = None
+
+    def run(self, **kwargs):
+        runner = self.runner
+        module = self.runner.module
+        self.cmd = list(runner.command)
+        self.context_run_args = dict(kwargs)
+
+        named_args = dict(module.params)
+        named_args.update(kwargs)
+        for arg_name in self.args_order:
+            value = None
+            try:
+                value = named_args[arg_name]
+                self.cmd.extend(runner.arg_formats[arg_name](value, ctx_ignore_none=self.ignore_value_none))
+            except KeyError:
+                raise MissingArgumentValue(self.args_order, arg_name)
+            except Exception as e:
+                raise FormatError(arg_name, value, runner.arg_formats[arg_name], e)
+
+        results = module.run_command(self.cmd, **self.run_command_args)
+        self.results_rc, self.results_out, self.results_err = results
+        self.results_processed = self.output_process(*results)
+        return self.results_processed
+
+    @property
+    def run_info(self):
+        return dict(
+            ignore_value_none=self.ignore_value_none,
+            check_rc=self.check_rc,
+            environ_update=self.environ_update,
+            args_order=self.args_order,
+            cmd=self.cmd,
+            run_command_args=self.run_command_args,
+            context_run_args=self.context_run_args,
+            results_rc=self.results_rc,
+            results_out=self.results_out,
+            results_err=self.results_err,
+            results_processed=self.results_processed,
+        )
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        return False
+
+
+fmt = _Format()

tests/integration/targets/cmd_runner/aliases

@@ -0,0 +1 @@
+shippable/posix/group2

tests/integration/targets/cmd_runner/library/cmd_echo.py

@@ -0,0 +1,78 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# (c) 2022, Alexei Znamensky <russoz@gmail.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
+
+import sys
+
+DOCUMENTATION = '''
+module: cmd_echo
+author: "Alexei Znamensky (@russoz)"
+short_description: Simple module for testing
+description:
+  - Simple module test description.
+options:
+  command:
+    description: aaa
+    type: list
+    elements: str
+    required: true
+  arg_formats:
+    description: bbb
+    type: dict
+    required: true
+  arg_order:
+    description: ccc
+    type: raw
+    required: true
+  arg_values:
+    description: ddd
+    type: list
+    required: true
+  aa:
+    description: eee
+    type: raw
+'''
+
+EXAMPLES = ""
+
+RETURN = ""
+
+from ansible.module_utils.basic import AnsibleModule
+from ansible_collections.community.general.plugins.module_utils.cmd_runner import CmdRunner, fmt
+
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            arg_formats=dict(type="dict", default={}),
+            arg_order=dict(type="raw", required=True),
+            arg_values=dict(type="dict", default={}),
+            aa=dict(type="raw"),
+        ),
+    )
+    p = module.params
+
+    arg_formats = {}
+    for arg, fmt_spec in p['arg_formats'].items():
+        func = getattr(fmt, fmt_spec['func'])
+        args = fmt_spec.get("args", [])
+
+        arg_formats[arg] = func(*args)
+
+    runner = CmdRunner(module, ['echo', '--'], arg_formats=arg_formats)
+
+    info = None
+    with runner.context(p['arg_order']) as ctx:
+        result = ctx.run(**p['arg_values'])
+        info = ctx.run_info
+    rc, out, err = result
+
+    module.exit_json(rc=rc, out=out, err=err, info=info)
+
+
+if __name__ == '__main__':
+    main()

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

@@ -0,0 +1,7 @@
+# (c) 2022, Alexei Znamensky
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+- name: parameterized test cmd_echo
+  ansible.builtin.include_tasks:
+    file: test_cmd_echo.yml
+  loop: "{{ cmd_echo_tests }}"

tests/integration/targets/cmd_runner/tasks/test_cmd_echo.yml

@@ -0,0 +1,13 @@
+---
+- name: test cmd_echo [{{ item.name }}]
+  cmd_echo:
+    arg_formats: "{{ item.arg_formats|default(omit) }}"
+    arg_order: "{{ item.arg_order }}"
+    arg_values: "{{ item.arg_values|default(omit) }}"
+    aa: "{{ item.aa|default(omit) }}"
+  register: test_result
+  ignore_errors: "{{ item.expect_error|default(omit) }}"
+
+- name: check results [{{ item.name }}]
+  assert:
+    that: "{{ item.assertions }}"

tests/integration/targets/cmd_runner/vars/main.yml

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+# (c) 2022, Alexei Znamensky
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+cmd_echo_tests:
+  - name: set aa and bb value
+    arg_formats:
+      aa:
+        func: as_opt_eq_val
+        args: [--answer]
+      bb:
+        func: as_bool
+        args: [--bb-here]
+    arg_order: 'aa bb'
+    arg_values:
+      bb: true
+    aa: 11
+    assertions:
+      - test_result.rc == 0
+      - test_result.out == "-- --answer=11 --bb-here\n"
+      - test_result.err == ""
+
+  - name: default aa value
+    arg_formats:
+      aa:
+        func: as_opt_eq_val
+        args: [--answer]
+      bb:
+        func: as_bool
+        args: [--bb-here]
+    arg_order: ['aa', 'bb']
+    arg_values:
+      aa: 43
+      bb: true
+    assertions:
+      - test_result.rc == 0
+      - test_result.out == "-- --answer=43 --bb-here\n"
+      - test_result.err == ""
+
+  - name: implicit aa format
+    arg_formats:
+      bb:
+        func: as_bool
+        args: [--bb-here]
+    arg_order: ['aa', 'bb']
+    arg_values:
+      bb: true
+    aa: 1984
+    assertions:
+      - test_result.rc == 0
+      - test_result.out == "-- --aa 1984 --bb-here\n"
+      - test_result.err == ""
+
+  - name: missing bb format
+    arg_order: ['aa', 'bb']
+    arg_values:
+      bb: true
+    aa: 1984
+    expect_error: true
+    assertions:
+      - test_result is failed
+      - test_result.rc == 1
+      - '"out" not in test_result'
+      - '"err" not in test_result'
+      - >-
+        "MissingArgumentFormat: Cannot find format for parameter bb"
+        in test_result.module_stderr
+
+  - name: missing bb value
+    arg_formats:
+      bb:
+        func: as_bool
+        args: [--bb-here]
+    arg_order: 'aa bb'
+    aa: 1984
+    expect_error: true
+    assertions:
+      - test_result is failed
+      - test_result.rc == 1
+      - '"out" not in test_result'
+      - '"err" not in test_result'
+      - >-
+        "MissingArgumentValue: Cannot find value for parameter bb"
+        in test_result.module_stderr

tests/unit/plugins/module_utils/test_cmd_runner.py

@@ -0,0 +1,306 @@
+# -*- coding: utf-8 -*-
+# (c) 2022, Alexei Znamensky <russoz@gmail.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
+
+from sys import version_info
+
+import pytest
+
+from ansible_collections.community.general.tests.unit.compat.mock import MagicMock, PropertyMock
+from ansible_collections.community.general.plugins.module_utils.cmd_runner import CmdRunner, fmt
+
+
+TC_FORMATS = dict(
+    simple_boolean__true=(fmt.as_bool, ("--superflag",), True, ["--superflag"]),
+    simple_boolean__false=(fmt.as_bool, ("--superflag",), False, []),
+    simple_boolean__none=(fmt.as_bool, ("--superflag",), None, []),
+    simple_boolean_not__true=(fmt.as_bool_not, ("--superflag",), True, []),
+    simple_boolean_not__false=(fmt.as_bool_not, ("--superflag",), False, ["--superflag"]),
+    simple_boolean_not__none=(fmt.as_bool_not, ("--superflag",), None, ["--superflag"]),
+    simple_optval__str=(fmt.as_optval, ("-t",), "potatoes", ["-tpotatoes"]),
+    simple_optval__int=(fmt.as_optval, ("-t",), 42, ["-t42"]),
+    simple_opt_val__str=(fmt.as_opt_val, ("-t",), "potatoes", ["-t", "potatoes"]),
+    simple_opt_val__int=(fmt.as_opt_val, ("-t",), 42, ["-t", "42"]),
+    simple_opt_eq_val__str=(fmt.as_opt_eq_val, ("--food",), "potatoes", ["--food=potatoes"]),
+    simple_opt_eq_val__int=(fmt.as_opt_eq_val, ("--answer",), 42, ["--answer=42"]),
+    simple_list_potato=(fmt.as_list, (), "literal_potato", ["literal_potato"]),
+    simple_list_42=(fmt.as_list, (), 42, ["42"]),
+    simple_map=(fmt.as_map, ({'a': 1, 'b': 2, 'c': 3},), 'b', ["2"]),
+    simple_default_type__list=(fmt.as_default_type, ("list",), [1, 2, 3, 5, 8], ["--1", "--2", "--3", "--5", "--8"]),
+    simple_default_type__bool_true=(fmt.as_default_type, ("bool", "what"), True, ["--what"]),
+    simple_default_type__bool_false=(fmt.as_default_type, ("bool", "what"), False, []),
+    simple_default_type__potato=(fmt.as_default_type, ("any-other-type", "potato"), "42", ["--potato", "42"]),
+    simple_fixed_true=(fmt.as_fixed, [("--always-here", "--forever")], True, ["--always-here", "--forever"]),
+    simple_fixed_false=(fmt.as_fixed, [("--always-here", "--forever")], False, ["--always-here", "--forever"]),
+    simple_fixed_none=(fmt.as_fixed, [("--always-here", "--forever")], None, ["--always-here", "--forever"]),
+    simple_fixed_str=(fmt.as_fixed, [("--always-here", "--forever")], "something", ["--always-here", "--forever"]),
+)
+if tuple(version_info) >= (3, 1):
+    from collections import OrderedDict
+
+    # needs OrderedDict to provide a consistent key order
+    TC_FORMATS["simple_default_type__dict"] = (  # type: ignore
+        fmt.as_default_type,
+        ("dict",),
+        OrderedDict((('a', 1), ('b', 2))),
+        ["--a=1", "--b=2"]
+    )
+TC_FORMATS_IDS = sorted(TC_FORMATS.keys())
+
+
+@pytest.mark.parametrize('func, fmt_opt, value, expected',
+                         (TC_FORMATS[tc] for tc in TC_FORMATS_IDS),
+                         ids=TC_FORMATS_IDS)
+def test_arg_format(func, fmt_opt, value, expected):
+    fmt_func = func(*fmt_opt)
+    actual = fmt_func(value, ctx_ignore_none=True)
+    print("formatted string = {0}".format(actual))
+    assert actual == expected, "actual = {0}".format(actual)
+
+
+TC_RUNNER = dict(
+    # SAMPLE: This shows all possible elements of a test case. It does not actually run.
+    #
+    # testcase_name=(
+    #     # input
+    #     dict(
+    #         args_bundle = dict(
+    #             param1=dict(
+    #                 type="int",
+    #                 value=11,
+    #                 fmt_func=fmt.as_opt_eq_val,
+    #                 fmt_arg="--answer",
+    #             ),
+    #             param2=dict(
+    #                 fmt_func=fmt.as_bool,
+    #                 fmt_arg="--bb-here",
+    #             )
+    #         ),
+    #         runner_init_args = dict(
+    #             command="testing",
+    #             default_args_order=(),
+    #             check_rc=False,
+    #             force_lang="C",
+    #             path_prefix=None,
+    #             environ_update=None,
+    #         ),
+    #         runner_ctx_args = dict(
+    #             args_order=['aa', 'bb'],
+    #             output_process=None,
+    #             ignore_value_none=True,
+    #         ),
+    #     ),
+    #     # command execution
+    #     dict(
+    #         runner_ctx_run_args = dict(bb=True),
+    #         rc = 0,
+    #         out = "",
+    #         err = "",
+    #     ),
+    #     # expected
+    #     dict(
+    #         results=(),
+    #         run_info=dict(
+    #             cmd=['/mock/bin/testing', '--answer=11', '--bb-here'],
+    #             environ_update={'LANGUAGE': 'C', 'LC_ALL': 'C'},
+    #         ),
+    #         exc=None,
+    #     ),
+    # ),
+    #
+    aa_bb=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=11, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(),
+            runner_ctx_args=dict(args_order=['aa', 'bb']),
+        ),
+        dict(runner_ctx_run_args=dict(bb=True), rc=0, out="", err=""),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=11', '--bb-here'],
+                environ_update={'LANGUAGE': 'C', 'LC_ALL': 'C'},
+                args_order=('aa', 'bb'),
+            ),
+        ),
+    ),
+    aa_bb_default_order=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=11, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(default_args_order=['bb', 'aa']),
+            runner_ctx_args=dict(),
+        ),
+        dict(runner_ctx_run_args=dict(bb=True), rc=0, out="", err=""),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--bb-here', '--answer=11'],
+                environ_update={'LANGUAGE': 'C', 'LC_ALL': 'C'},
+                args_order=('bb', 'aa'),
+            ),
+        ),
+    ),
+    aa_bb_default_order_args_order=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=11, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(default_args_order=['bb', 'aa']),
+            runner_ctx_args=dict(args_order=['aa', 'bb']),
+        ),
+        dict(runner_ctx_run_args=dict(bb=True), rc=0, out="", err=""),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=11', '--bb-here'],
+                environ_update={'LANGUAGE': 'C', 'LC_ALL': 'C'},
+                args_order=('aa', 'bb'),
+            ),
+        ),
+    ),
+    aa_bb_dup_in_args_order=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=11, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(),
+            runner_ctx_args=dict(args_order=['aa', 'bb', 'aa']),
+        ),
+        dict(runner_ctx_run_args=dict(bb=True), rc=0, out="", err=""),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=11', '--bb-here', '--answer=11'],
+            ),
+        ),
+    ),
+    aa_bb_process_output=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=11, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(default_args_order=['bb', 'aa']),
+            runner_ctx_args=dict(
+                args_order=['aa', 'bb'],
+                output_process=lambda rc, out, err: '-/-'.join([str(rc), out, err])
+            ),
+        ),
+        dict(runner_ctx_run_args=dict(bb=True), rc=0, out="ni", err="nu"),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=11', '--bb-here'],
+            ),
+            results="0-/-ni-/-nu"
+        ),
+    ),
+    aa_bb_ignore_none_with_none=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=49, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(default_args_order=['bb', 'aa']),
+            runner_ctx_args=dict(
+                args_order=['aa', 'bb'],
+                ignore_value_none=True,  # default
+            ),
+        ),
+        dict(runner_ctx_run_args=dict(bb=None), rc=0, out="ni", err="nu"),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=49'],
+            ),
+        ),
+    ),
+    aa_bb_ignore_not_none_with_none=(
+        dict(
+            args_bundle=dict(
+                aa=dict(type="int", value=49, fmt_func=fmt.as_opt_eq_val, fmt_arg="--answer"),
+                bb=dict(fmt_func=fmt.as_bool, fmt_arg="--bb-here"),
+            ),
+            runner_init_args=dict(default_args_order=['bb', 'aa']),
+            runner_ctx_args=dict(
+                args_order=['aa', 'bb'],
+                ignore_value_none=False,
+            ),
+        ),
+        dict(runner_ctx_run_args=dict(aa=None, bb=True), rc=0, out="ni", err="nu"),
+        dict(
+            run_info=dict(
+                cmd=['/mock/bin/testing', '--answer=None', '--bb-here'],
+            ),
+        ),
+    ),
+)
+TC_RUNNER_IDS = sorted(TC_RUNNER.keys())
+
+
+@pytest.mark.parametrize('runner_input, cmd_execution, expected',
+                         (TC_RUNNER[tc] for tc in TC_RUNNER_IDS),
+                         ids=TC_RUNNER_IDS)
+def test_runner(runner_input, cmd_execution, expected):
+    arg_spec = {}
+    params = {}
+    arg_formats = {}
+    for k, v in runner_input['args_bundle'].items():
+        try:
+            arg_spec[k] = {'type': v['type']}
+        except KeyError:
+            pass
+        try:
+            params[k] = v['value']
+        except KeyError:
+            pass
+        try:
+            arg_formats[k] = v['fmt_func'](v['fmt_arg'])
+        except KeyError:
+            pass
+
+    orig_results = tuple(cmd_execution[x] for x in ('rc', 'out', 'err'))
+
+    print("arg_spec={0}\nparams={1}\narg_formats={2}\n".format(
+        arg_spec,
+        params,
+        arg_formats,
+    ))
+
+    module = MagicMock()
+    type(module).argument_spec = PropertyMock(return_value=arg_spec)
+    type(module).params = PropertyMock(return_value=params)
+    module.get_bin_path.return_value = '/mock/bin/testing'
+    module.run_command.return_value = orig_results
+
+    runner = CmdRunner(
+        module=module,
+        command="testing",
+        arg_formats=arg_formats,
+        **runner_input['runner_init_args']
+    )
+
+    def _assert_run_info(actual, expected):
+        reduced = dict((k, actual[k]) for k in expected.keys())
+        assert reduced == expected, "{0}".format(reduced)
+
+    def _assert_run(runner_input, cmd_execution, expected, ctx, results):
+        _assert_run_info(ctx.run_info, expected['run_info'])
+        assert results == expected.get('results', orig_results)
+
+    exc = expected.get("exc")
+    if exc:
+        with pytest.raises(exc):
+            with runner.context(**runner_input['runner_ctx_args']) as ctx:
+                results = ctx.run(**cmd_execution['runner_ctx_run_args'])
+                _assert_run(runner_input, cmd_execution, expected, ctx, results)
+
+    else:
+        with runner.context(**runner_input['runner_ctx_args']) as ctx:
+            results = ctx.run(**cmd_execution['runner_ctx_run_args'])
+            _assert_run(runner_input, cmd_execution, expected, ctx, results)