cli.TestInjiCmd.test_12factor_config_sourcing() - Code Metrics - Inspection of "503712e9356e47738a8db334331ec52f144ed660" - shalomb/inji - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — develop (503712)

by Shalom

created 2020-08-18 07:44 UTC

cli.TestInjiCmd.test_12factor_config_sourcing() B

↳ Parent: cli

Complexity

Conditions

Size

Total Lines	110
Code Lines	81

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	81
nop	1
dl	0
loc	110
rs	7.6218
c	0
b	0
f	0

How to fix Long Method

#!/usr/bin/python3

# -*- coding: utf-8 -*-

import atexit
import json
import os
from   os.path import abspath, dirname, join
import pytest
import re
import shutil
import signal
import subprocess
import sys
import tempfile
import unittest

sys.path.insert(0, join(dirname(abspath(__file__)), '../..'))
sys.path.insert(0, join(dirname(abspath(__file__)), '../../inji'))

import inji
inji = abspath(join(sys.path[0], 'inji'))

def check_output(*args, **kwargs):
  os.environ['PYTHONUNBUFFERED'] = "1"
  return subprocess.check_output( [*args], **kwargs ).decode('utf-8')

def run_negative_test( command=[ inji ],
                        exit_code=2,
                        errors=None,
                        stderr=subprocess.STDOUT,
                        input=None
                      ):
  """ Run an inji command checking for the provided exit code
      and strings in stderr
  """
  class NegativeTestException(Exception): pass
  with pytest.raises(NegativeTestException) as e_info:
    try:
      check_output(*command, stderr=stderr, input=input)
    except subprocess.CalledProcessError as exc:
      msg = 'exit_code:{} output:{}'.format(exc.returncode, exc.output)
      raise NegativeTestException(msg) from exc
  e = str(e_info)
  assert f"exit_code:{exit_code} " in e
  for string in errors:
    assert re.search(f'{string}', e)
  return True

def file_from_text(*args, **kwargs):
  """ Write args to a tempfile and return the filename """

  fqdir=kwargs.get('dir', tempfile.tempdir)

  if kwargs.get('name') is None:
    _, filename = tempfile.mkstemp( text=True, dir=fqdir)
  else:
    filename = join(fqdir, kwargs.get('name'))

  atexit.register(os.remove, filename)
  with open(filename, "a+") as f:
    f.write('\n'.join(args))

  return abspath(filename)

class TestFixtureHelloWorld(unittest.TestCase):

  def test_hello_world(self):
    assert check_output('/bin/echo', 'hello', 'world') == "hello world\n"

  def test_check_output(self):
    out = check_output( 'sed', 's/foo/bar/', input=b'foo' )
    assert "bar" in out

class TestInjiCmd(unittest.TestCase):

  def test_help(self):
    """Test help message is emitted"""
    assert re.search('usage: inji', check_output(inji, '-h'))

  def test_stdin(self):
    """Templates should be read in from STDIN (-) by default"""
    assert check_output( inji,
                          input=b"{% set foo='world!' %}Hola {{ foo }}"
      ) == "Hola world!\n"

  def test_stdin_empty_input(self):
    """Empty template string should return a newline"""
    assert '\n' == check_output( inji, input=b"" )

  def test_json_config_args(self):
    """Config passed as JSON string"""
    assert check_output(
        inji, '-j', '{"foo": "world!"}',
          input=b"Hola {{ foo }}"
      ) == "Hola world!\n"

  def test_invalid_json_config_args(self):
    """Empty json config args should cause an error"""
    input_cases = [ '', '}{', '{@}' ] # invalid JSON inputs
    for json in input_cases:
      run_negative_test(
        command=[ inji, '-j', json ],
        errors=[ 'Error parsing JSON config:' ]
      )

  def test_kv_config_args(self):
    """ Config passed as KV strings """
    assert check_output(
        inji,
          '-k', 'foo=bar',
          '-k', 'foo=world!',  # valid, last declaration wins
          input=b"Hola {{ foo }}"
      ) == "Hola world!\n"
    assert check_output(
        inji, '-k', 'foo=',    # valid, sets foo to be empty
          input=b"Hola {{ foo }}"
      ) ==  "Hola \n"

  def test_invalid_kv_config_args(self):
    """Invalid KV config args should cause an error"""
    input_cases = [ '', '=', '=baz' ] # invalid KV inputs
    for kv in input_cases:
      run_negative_test(
        command=[ inji, '-k', kv ],
        errors=[ 'Invalid key found parsing' ]
      )

  def test_12factor_config_sourcing(self):
    """Test config sourcing precendence should adhere to 12-factor app expectations"""
    tmpdir = tempfile.mkdtemp(prefix='param-')
    atexit.register(shutil.rmtree, tmpdir)

    for item in ['dev', 'prod', 'stage']:
      cdir = os.path.join(tmpdir, item)
      os.mkdir(cdir)
      for file in 'a.yml', 'b.yaml', 'c.yaml':
        fqn = os.path.join(cdir, file)
        file_from_text(f"zoo: {file}\nitem: {item}", dir=cdir, name=fqn)

    cfg_file = file_from_text(
        f"zar: bella\nzoo: cfg",
        dir=tmpdir, name='inji.yml' )

    param_file = file_from_text(
        f"zar: zella\nzoo: zorg",
        dir=tmpdir, name='vars.yaml' )

    # needed to source the default config from ./inji.y?ml
    OLDPWD=os.getcwd()
    os.chdir(tmpdir)

    # test we are able to recursively source params
    # but also source from the default (low-precedence) config file relative to PWD
    assert re.search('Hola \w+ from bella',
      check_output(
        inji,
          '-o', f"{tmpdir}/dev",
          input=b"Hola {{ item }} from {{ zar }}"
      )
    )

    # dev/c.yaml should be last file sourced
    assert check_output(
        inji, '-o', f"{tmpdir}/dev",
          input=b"Hola {{ zoo }}"
      ) == "Hola c.yaml\n"

    # prod/ should be the last overlay sourced
    assert check_output(
        inji,
          '-o', f"{tmpdir}/stage",
          '-o', f"{tmpdir}/dev",
          '-o', f"{tmpdir}/prod",
          input=b"Hola {{ item }}"
      ) == "Hola prod\n"

    # named config file trumps overlays, arg position is irrelevant
    assert check_output(
        inji,
          '-o', f"{tmpdir}/stage",
          '-o', f"{tmpdir}/prod",
          '-v', param_file,
          '-o', f"{tmpdir}/dev",
          input=b"Hola {{ zar }} from {{ zoo }}"
      ) == "Hola zella from zorg\n"

    # env vars trump named config files
    os.environ['zoo']='env'
    assert check_output(
        inji,
          '-o', f"{tmpdir}/stage",
          '-o', f"{tmpdir}/prod",
          '-v', param_file,
          '-o', f"{tmpdir}/dev",
          input=b"Hola {{ zar }} from {{ zoo }}"
      ) == "Hola zella from env\n"

    # cli params passed in as JSON strings at the CLI trump all files
    assert check_output(
        inji,
          '-o', f"{tmpdir}/stage",
          '-j', '{"zoo": "world!"}',
          '-o', f"{tmpdir}/prod",
          '-v', param_file,
          '-o', f"{tmpdir}/dev",
          input=b"Hola {{ zar }} from {{ zoo }}"
      ) == "Hola zella from world!\n"

    # cli params passed in as KV pairs take ultimate precendence
    # Q: why do KV pairs take precendece over JSON?
    # A: the use-case is overriding particular values from a JSON blurb sourced
    #    from a file or external system.
    assert check_output(
        inji,
          '-k', 'zar=della',
          '-o', f"{tmpdir}/stage",
          '-j', '{"zoo": "world!"}',
          '-o', f"{tmpdir}/prod",
          '-v', param_file,
          '-o', f"{tmpdir}/dev",
          input=b"Hola {{ zar }} from {{ zoo }}"
      ) == "Hola della from world!\n"

    # except when params are defined in the templates themselves, off course!
    assert check_output(
        inji,
          '-k', 'zar=della',
          '-o', f"{tmpdir}/stage",
          '-j', '{"zoo": "mars"}',
          '-o', f"{tmpdir}/prod",
          '-v', param_file,
          '-o', f"{tmpdir}/dev",
          input=b"{% set zar='quux' %}Hola {{ zar }} from {{ zoo }}"
      ) == "Hola quux from mars\n"

    os.environ.pop('zoo')
    os.chdir(OLDPWD)

  def test_undefined_variables(self):
    """ Undefined variables should cause a failure """
    run_negative_test(
      input=b"{% set foo='world!' %}Hola {{ bar }}",
      exit_code=1,
      errors=[
        'UndefinedError',
        'variable \W{4}bar\W{4} is undefined in template'
      ]
    )

  def test_keep_undefined_var(self):
    """Undefined variable placeholders in keep mode should be kept"""
    assert check_output( inji, '-s', 'keep',
                          input=b"[Hola {{ foo }}]"
      ) == '[Hola {{ foo }}]\n'

  def test_empty_undefined_var(self):
    """Undefined variables in empty mode should leave spaces behind placeholders"""
    assert check_output( inji, '-s', 'empty',
                          input=b"[Hola {{ foo }}]"
      ) == '[Hola ]\n'

  def test_template_render_with_envvars(self):
    """Environment variables should be referenceable as parameters"""
    template = file_from_text("Hola {{ foo }}")
    os.environ['foo'] = 'world!'
    assert check_output( inji, '-t', template ) == 'Hola world!\n'
    os.environ.pop('foo')

  def test_template_render_with_internal_vars(self):
    """
    Jinja template should render correctly
    referencing those variables set in the templates themselves
    """
    template = file_from_text("{% set foo='world!' %}Hola {{ foo }}")
    assert check_output( inji, '-t', template ) == 'Hola world!\n'

  def test_template_missing(self):
    """ Missing template files should cause an error """
    run_negative_test(
      command=[ inji, '-t', 'nonexistent-template.j2' ],
      errors=[
        'nonexistent-template.j2.. does not exist'
      ]
    )

  def test_template_directory(self):
    """ Using a directory as a template source should cause an error"""
    run_negative_test(
      command=[ inji, '-t', '/' ],
      errors=[
        'error: argument',
        'path ../.. is not a file',
      ]
    )

  def test_template_render_with_varsfile(self):
    """Params from params files should be rendered on the template output"""
    template = file_from_text("Hola {{ foo }}")
    varsfile = file_from_text("foo: world!")
    assert check_output(
            inji, '-t', template, '-v', varsfile
        ) == 'Hola world!\n'

  def test_template_render_with_multiple_varsfiles(self):
    """Params from multiple files should be merged before rendering"""
    template = file_from_text("Hola {{ foo }}, Hello {{ bar }}, t{{ t }}")
    varsfile1 = file_from_text("foo: world!\nt: quux")
    varsfile2 = file_from_text("bar: metaverse\nt: moocow")
    assert check_output(
          inji, '-t', template,
                '-v', varsfile1,
                '-v', varsfile2
      ) == 'Hola world!, Hello metaverse, tmoocow\n'

  def test_error_with_empty_varsfile(self):
    """ An empty vars file is an error, we ought to fail early """
    """
    There may be a case for allowing this to just be a warning and so
    we may change this behaviour in the future. For now, it definitely
    is something we should fail-early on.
    """
    assert run_negative_test(
      command=[
        inji, '-t', file_from_text("Hola {{ foo }}"),
              '-v', file_from_text('')
      ],
      exit_code=1,
      errors=[
        'TypeError: .* contains no data'
      ]
    )

  def test_error_with_malformed_varsfile(self):
    """ An invalid varsfile is a fail-early error """
    run_negative_test(
      command=[
        inji, '-t', file_from_text("Hola {{ foo }}"),
              '-v', file_from_text('@')
      ],
      exit_code=1,
      errors=[
        'cannot start any token'
      ]
    )

  def test_sigint(self):
    """ Test that ctrl-c's are caught properly """
    with subprocess.Popen([inji]) as proc:
      proc.send_signal(signal.SIGINT)
      proc.wait(3)
      # exit status -N to indicate killed by signal N
      assert proc.returncode == -1 * signal.SIGINT # SIGINT == 2

if __name__ == '__main__':
  TestInjiCmd().test_sigint()



1			#!/usr/bin/python3
2
3			# -- coding: utf-8 --
4
5			import atexit
6			import json
7			import os
8			from os.path import abspath, dirname, join
9			import pytest
10			import re
11			import shutil
12			import signal
13			import subprocess
14			import sys
15			import tempfile
16			import unittest
17
18			sys.path.insert(0, join(dirname(abspath(__file__)), '../..'))
19			sys.path.insert(0, join(dirname(abspath(__file__)), '../../inji'))
20
21			import inji
22			inji = abspath(join(sys.path[0], 'inji'))
23
24			def check_output(args, *kwargs):
25			os.environ['PYTHONUNBUFFERED'] = "1"
26			return subprocess.check_output( [args], *kwargs ).decode('utf-8')
27
28			def run_negative_test( command=[ inji ],
29			exit_code=2,
30			errors=None,
31			stderr=subprocess.STDOUT,
32			input=None
33			):
34			""" Run an inji command checking for the provided exit code
35			and strings in stderr
36			"""
37			class NegativeTestException(Exception): pass
38			with pytest.raises(NegativeTestException) as e_info:
39			try:
40			check_output(*command, stderr=stderr, input=input)
41			except subprocess.CalledProcessError as exc:
42			msg = 'exit_code:{} output:{}'.format(exc.returncode, exc.output)
43			raise NegativeTestException(msg) from exc
44			e = str(e_info)
45			assert f"exit_code:{exit_code} " in e
46			for string in errors:
47			assert re.search(f'{string}', e)
48			return True
49
50			def file_from_text(args, *kwargs):
51			""" Write args to a tempfile and return the filename """
52
53			fqdir=kwargs.get('dir', tempfile.tempdir)
54
55			if kwargs.get('name') is None:
56			_, filename = tempfile.mkstemp( text=True, dir=fqdir)
57			else:
58			filename = join(fqdir, kwargs.get('name'))
59
60			atexit.register(os.remove, filename)
61			with open(filename, "a+") as f:
62			f.write('\n'.join(args))
63
64			return abspath(filename)
65
66			class TestFixtureHelloWorld(unittest.TestCase):
67
68			def test_hello_world(self):
69			assert check_output('/bin/echo', 'hello', 'world') == "hello world\n"
70
71			def test_check_output(self):
72			out = check_output( 'sed', 's/foo/bar/', input=b'foo' )
73			assert "bar" in out
74
75			class TestInjiCmd(unittest.TestCase):
76
77			def test_help(self):
78			"""Test help message is emitted"""
79			assert re.search('usage: inji', check_output(inji, '-h'))
80
81			def test_stdin(self):
82			"""Templates should be read in from STDIN (-) by default"""
83			assert check_output( inji,
84			input=b"{% set foo='world!' %}Hola {{ foo }}"
85			) == "Hola world!\n"
86
87			def test_stdin_empty_input(self):
88			"""Empty template string should return a newline"""
89			assert '\n' == check_output( inji, input=b"" )
90
91			def test_json_config_args(self):
92			"""Config passed as JSON string"""
93			assert check_output(
94			inji, '-j', '{"foo": "world!"}',
95			input=b"Hola {{ foo }}"
96			) == "Hola world!\n"
97
98			def test_invalid_json_config_args(self):
99			"""Empty json config args should cause an error"""
100			input_cases = [ '', '}{', '{@}' ] # invalid JSON inputs
101			for json in input_cases:
102			run_negative_test(
103			command=[ inji, '-j', json ],
104			errors=[ 'Error parsing JSON config:' ]
105			)
106
107			def test_kv_config_args(self):
108			""" Config passed as KV strings """
109			assert check_output(
110			inji,
111			'-k', 'foo=bar',
112			'-k', 'foo=world!', # valid, last declaration wins
113			input=b"Hola {{ foo }}"
114			) == "Hola world!\n"
115			assert check_output(
116			inji, '-k', 'foo=', # valid, sets foo to be empty
117			input=b"Hola {{ foo }}"
118			) == "Hola \n"
119
120			def test_invalid_kv_config_args(self):
121			"""Invalid KV config args should cause an error"""
122			input_cases = [ '', '=', '=baz' ] # invalid KV inputs
123			for kv in input_cases:
124			run_negative_test(
125			command=[ inji, '-k', kv ],
126			errors=[ 'Invalid key found parsing' ]
127			)
128
129			def test_12factor_config_sourcing(self):
130			"""Test config sourcing precendence should adhere to 12-factor app expectations"""
131			tmpdir = tempfile.mkdtemp(prefix='param-')
132			atexit.register(shutil.rmtree, tmpdir)
133
134			for item in ['dev', 'prod', 'stage']:
135			cdir = os.path.join(tmpdir, item)
136			os.mkdir(cdir)
137			for file in 'a.yml', 'b.yaml', 'c.yaml':
138			fqn = os.path.join(cdir, file)
139			file_from_text(f"zoo: {file}\nitem: {item}", dir=cdir, name=fqn)
140
141			cfg_file = file_from_text(
142			f"zar: bella\nzoo: cfg",
143			dir=tmpdir, name='inji.yml' )
144
145			param_file = file_from_text(
146			f"zar: zella\nzoo: zorg",
147			dir=tmpdir, name='vars.yaml' )
148
149			# needed to source the default config from ./inji.y?ml
150			OLDPWD=os.getcwd()
151			os.chdir(tmpdir)
152
153			# test we are able to recursively source params
154			# but also source from the default (low-precedence) config file relative to PWD
155			assert re.search('Hola \w+ from bella',
156			check_output(
157			inji,
158			'-o', f"{tmpdir}/dev",
159			input=b"Hola {{ item }} from {{ zar }}"
160			)
161			)
162
163			# dev/c.yaml should be last file sourced
164			assert check_output(
165			inji, '-o', f"{tmpdir}/dev",
166			input=b"Hola {{ zoo }}"
167			) == "Hola c.yaml\n"
168
169			# prod/ should be the last overlay sourced
170			assert check_output(
171			inji,
172			'-o', f"{tmpdir}/stage",
173			'-o', f"{tmpdir}/dev",
174			'-o', f"{tmpdir}/prod",
175			input=b"Hola {{ item }}"
176			) == "Hola prod\n"
177
178			# named config file trumps overlays, arg position is irrelevant
179			assert check_output(
180			inji,
181			'-o', f"{tmpdir}/stage",
182			'-o', f"{tmpdir}/prod",
183			'-v', param_file,
184			'-o', f"{tmpdir}/dev",
185			input=b"Hola {{ zar }} from {{ zoo }}"
186			) == "Hola zella from zorg\n"
187
188			# env vars trump named config files
189			os.environ['zoo']='env'
190			assert check_output(
191			inji,
192			'-o', f"{tmpdir}/stage",
193			'-o', f"{tmpdir}/prod",
194			'-v', param_file,
195			'-o', f"{tmpdir}/dev",
196			input=b"Hola {{ zar }} from {{ zoo }}"
197			) == "Hola zella from env\n"
198
199			# cli params passed in as JSON strings at the CLI trump all files
200			assert check_output(
201			inji,
202			'-o', f"{tmpdir}/stage",
203			'-j', '{"zoo": "world!"}',
204			'-o', f"{tmpdir}/prod",
205			'-v', param_file,
206			'-o', f"{tmpdir}/dev",
207			input=b"Hola {{ zar }} from {{ zoo }}"
208			) == "Hola zella from world!\n"
209
210			# cli params passed in as KV pairs take ultimate precendence
211			# Q: why do KV pairs take precendece over JSON?
212			# A: the use-case is overriding particular values from a JSON blurb sourced
213			# from a file or external system.
214			assert check_output(
215			inji,
216			'-k', 'zar=della',
217			'-o', f"{tmpdir}/stage",
218			'-j', '{"zoo": "world!"}',
219			'-o', f"{tmpdir}/prod",
220			'-v', param_file,
221			'-o', f"{tmpdir}/dev",
222			input=b"Hola {{ zar }} from {{ zoo }}"
223			) == "Hola della from world!\n"
224
225			# except when params are defined in the templates themselves, off course!
226			assert check_output(
227			inji,
228			'-k', 'zar=della',
229			'-o', f"{tmpdir}/stage",
230			'-j', '{"zoo": "mars"}',
231			'-o', f"{tmpdir}/prod",
232			'-v', param_file,
233			'-o', f"{tmpdir}/dev",
234			input=b"{% set zar='quux' %}Hola {{ zar }} from {{ zoo }}"
235			) == "Hola quux from mars\n"
236
237			os.environ.pop('zoo')
238			os.chdir(OLDPWD)
239
240			def test_undefined_variables(self):
241			""" Undefined variables should cause a failure """
242			run_negative_test(
243			input=b"{% set foo='world!' %}Hola {{ bar }}",
244			exit_code=1,
245			errors=[
246			'UndefinedError',
247			'variable \W{4}bar\W{4} is undefined in template'
248			]
249			)
250
251			def test_keep_undefined_var(self):
252			"""Undefined variable placeholders in keep mode should be kept"""
253			assert check_output( inji, '-s', 'keep',
254			input=b"[Hola {{ foo }}]"
255			) == '[Hola {{ foo }}]\n'
256
257			def test_empty_undefined_var(self):
258			"""Undefined variables in empty mode should leave spaces behind placeholders"""
259			assert check_output( inji, '-s', 'empty',
260			input=b"[Hola {{ foo }}]"
261			) == '[Hola ]\n'
262
263			def test_template_render_with_envvars(self):
264			"""Environment variables should be referenceable as parameters"""
265			template = file_from_text("Hola {{ foo }}")
266			os.environ['foo'] = 'world!'
267			assert check_output( inji, '-t', template ) == 'Hola world!\n'
268			os.environ.pop('foo')
269
270			def test_template_render_with_internal_vars(self):
271			"""
272			Jinja template should render correctly
273			referencing those variables set in the templates themselves
274			"""
275			template = file_from_text("{% set foo='world!' %}Hola {{ foo }}")
276			assert check_output( inji, '-t', template ) == 'Hola world!\n'
277
278			def test_template_missing(self):
279			""" Missing template files should cause an error """
280			run_negative_test(
281			command=[ inji, '-t', 'nonexistent-template.j2' ],
282			errors=[
283			'nonexistent-template.j2.. does not exist'
284			]
285			)
286
287			def test_template_directory(self):
288			""" Using a directory as a template source should cause an error"""
289			run_negative_test(
290			command=[ inji, '-t', '/' ],
291			errors=[
292			'error: argument',
293			'path ../.. is not a file',
294			]
295			)
296
297			def test_template_render_with_varsfile(self):
298			"""Params from params files should be rendered on the template output"""
299			template = file_from_text("Hola {{ foo }}")
300			varsfile = file_from_text("foo: world!")
301			assert check_output(
302			inji, '-t', template, '-v', varsfile
303			) == 'Hola world!\n'
304
305			def test_template_render_with_multiple_varsfiles(self):
306			"""Params from multiple files should be merged before rendering"""
307			template = file_from_text("Hola {{ foo }}, Hello {{ bar }}, t{{ t }}")
308			varsfile1 = file_from_text("foo: world!\nt: quux")
309			varsfile2 = file_from_text("bar: metaverse\nt: moocow")
310			assert check_output(
311			inji, '-t', template,
312			'-v', varsfile1,
313			'-v', varsfile2
314			) == 'Hola world!, Hello metaverse, tmoocow\n'
315
316			def test_error_with_empty_varsfile(self):
317			""" An empty vars file is an error, we ought to fail early """
318			"""
319			There may be a case for allowing this to just be a warning and so
320			we may change this behaviour in the future. For now, it definitely
321			is something we should fail-early on.
322			"""
323			assert run_negative_test(
324			command=[
325			inji, '-t', file_from_text("Hola {{ foo }}"),
326			'-v', file_from_text('')
327			],
328			exit_code=1,
329			errors=[
330			'TypeError: .* contains no data'
331			]
332			)
333
334			def test_error_with_malformed_varsfile(self):
335			""" An invalid varsfile is a fail-early error """
336			run_negative_test(
337			command=[
338			inji, '-t', file_from_text("Hola {{ foo }}"),
339			'-v', file_from_text('@')
340			],
341			exit_code=1,
342			errors=[
343			'cannot start any token'
344			]
345			)
346
347			def test_sigint(self):
348			""" Test that ctrl-c's are caught properly """
349			with subprocess.Popen([inji]) as proc:
350			proc.send_signal(signal.SIGINT)
351			proc.wait(3)
352			# exit status -N to indicate killed by signal N
353			assert proc.returncode == -1 * signal.SIGINT # SIGINT == 2
354
355			if __name__ == '__main__':
356			TestInjiCmd().test_sigint()
357
358

shalomb / inji

Branch — develop (503712)

cli.TestInjiCmd.test_12factor_config_sourcing() B

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