Do not use abbreviated options in tests

We do not want to have tests that need to be changed by completely unrelated patch series, just because abbreviations that used to be unique are being made non-unique by said patch series.

I stumbled over this while investigating the test failures in dl/rebase-i-keep-base
[https://dev.azure.com/gitgitgadget/git/_build/results?buildId=5482&view=ms.vss-test-web.build-test-results-tab]
: the new --keep-base option makes the --keep abbreviation of --keep-empty in t5407 non-unique, which causes the test suite to fail.

Changes since v1:

* Fixed a typo ("expaneded") in the last commit message.
* Added a regression test for the GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS handling.
* Adjusted the code in test-lib.sh that makes sure that this variable is
set: it is now consistent with the way we do similar things in that file already.

Johannes Schindelin (8):
tests (rebase): spell out the --keep-empty option
tests (rebase): spell out the --force-rebase option
t7810: do not abbreviate --no-exclude-standard nor --invert-match
t5531: avoid using an abbreviated option
tests (push): do not abbreviate the --follow-tags option tests (status): spell out the --find-renames option in full tests (pack-objects): use the full, unabbreviated --revs option
tests: disallow the use of abbreviated options (by default)

 parse-options.c                        |  9 ++++++
 t/README                               |  4 +++
 t/t0040-parse-options.sh               | 14 +++++++-
 t/t3415-rebase-autosquash.sh           |  2 +-
 t/t3430-rebase-merges.sh               |  4 +--
 t/t5317-pack-objects-filter-objects.sh | 44 +++++++++++++-------------
 t/t5407-post-rewrite-hook.sh           |  4 +--
 t/t5516-fetch-push.sh                  |  4 +--
 t/t5531-deep-submodule-push.sh         |  2 +-
 t/t7525-status-rename.sh               |  8 ++---
 t/t7810-grep.sh                        | 16 +++++-----
 t/test-lib.sh                          |  7 ++++
 12 files changed, 75 insertions(+), 43 deletions(-)

base-commit: 041f5ea1cf987a4068ef5f39ba0a09be85952064
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-167%2Fdscho%2Fdisallow-abbreviated-options-in-tests-v2
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-167/dscho/disallow-abbreviated-options-in-tests-v2
Pull-Request: https://github.com/gitgitgadget/git/pull/167

Range-diff vs v1:

 1:  a1b4b74b91 = 1:  a1b4b74b91 tests (rebase): spell out the `--keep-empty` option
 2:  017ec9a0c7 = 2:  017ec9a0c7 tests (rebase): spell out the `--force-rebase` option
 3:  7d8f6a2ee6 = 3:  7d8f6a2ee6 t7810: do not abbreviate `--no-exclude-standard` nor `--invert-match`
 4:  f45c435e4a = 4:  f45c435e4a t5531: avoid using an abbreviated option
 5:  7372059922 = 5:  7372059922 tests (push): do not abbreviate the `--follow-tags` option
 6:  531450c00d = 6:  531450c00d tests (status): spell out the `--find-renames` option in full
 7:  a722a065d2 = 7:  a722a065d2 tests (pack-objects): use the full, unabbreviated `--revs` option
 8:  04c36b1de9 ! 8:  a27d316855 tests: disallow the use of abbreviated options (by default)
     @@ -14,7 +14,7 @@
      
          For example, if a future contribution added a new mode
          `git init --babyproofing` and a previously-introduced test case used the
     -    fact that `git init --ba` expaneded to `git init --bare`, that future
     +    fact that `git init --ba` expanded to `git init --bare`, that future
          contribution would now have to touch seemingly unrelated tests just to
          keep the test suite from failing.
      
     @@ -115,6 +115,18 @@
       	test-tool parse-options --no-ambig >output 2>output.err &&
       	test_must_be_empty output.err &&
       	test_cmp expect output
     +@@
     + 	test-tool parse-options --expect="verbose: 0" -v -v -v --no-verbose
     + '
     + 
     ++test_expect_success 'GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS works' '
     ++	env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=false \
     ++		test-tool parse-options --ye &&
     ++	test_must_fail env GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=true \
     ++		test-tool parse-options --ye
     ++'
     ++
     + test_done
      
       diff --git a/t/test-lib.sh b/t/test-lib.sh
       --- a/t/test-lib.sh
     @@ -124,10 +136,11 @@
       export PERL_PATH SHELL_PATH
       
      +# Disallow the use of abbreviated options in the test suite by default
     -+test -n "$GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS" || {
     ++if test -n "${GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS:+isset}"
     ++then
      +	GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS=true
      +	export GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS
     -+}
     ++fi
      +
       ################################################################
       # It appears that people try to run tests without building...

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