test_embed.InitConfigTests fail on AIX

[aixtools]

BPO	34579
Nosy	@vstinner, @ericsnowcurrently, @aixtools
PRs	bpo-34579: Modify test_embed DEFAULT_CONFIG for AIX #9063

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-05-15.02:32:22.474>
created_at = <Date 2018-09-04.15:06:52.079>
labels = ['3.8', 'type-bug', 'tests']
title = 'test_embed.InitConfigTests fail on AIX'
updated_at = <Date 2019-05-15.02:32:22.474>
user = 'https://github.com/aixtools'

bugs.python.org fields:

activity = <Date 2019-05-15.02:32:22.474>
actor = 'vstinner'
assignee = 'none'
closed = True
closed_date = <Date 2019-05-15.02:32:22.474>
closer = 'vstinner'
components = ['Tests']
creation = <Date 2018-09-04.15:06:52.079>
creator = 'Michael.Felt'
dependencies = []
files = []
hgrepos = []
issue_num = 34579
keywords = ['patch']
message_count = 4.0
messages = ['324590', '325082', '325084', '325429']
nosy_count = 3.0
nosy_names = ['vstinner', 'eric.snow', 'Michael.Felt']
pr_nums = ['9063']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue34579'
versions = ['Python 3.8']

[aixtools]

test_init_default_config (test.test_embed.InitConfigTests) ... FAIL
test_init_dev_mode (test.test_embed.InitConfigTests) ... FAIL
test_init_env (test.test_embed.InitConfigTests) ... FAIL
test_init_from_config (test.test_embed.InitConfigTests) ... ok
test_init_global_config (test.test_embed.InitConfigTests) ... FAIL
test_init_isolated (test.test_embed.InitConfigTests) ... FAIL

This seems to be caused because the dump_config() output is not
'(null)' for the keys allocator, program, and pycache_prefix.

When these are 'expected' to be '' (rather than '(null)', all tests pass.

See PR

[vstinner]

What is the output of "./Programs/_testembed init_default_config"?

[vstinner]

Hum, you should run "env -i ./Programs/_testembed init_default_config" to run the program in an empty environment. test_embed modifies os.environ to remove all PYTHON* env vars.

[vstinner]

New changeset d206731 by Victor Stinner (Michael Felt) in branch 'master':
bpo-34579: Fix test_embed DEFAULT_CON AIX (GH-9063)
d206731