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tests: replace GNU-derived material with original coverage - #14004

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sylvestre wants to merge 6 commits into
uutils:mainfrom
sylvestre:license-cleanup-v2
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tests: replace GNU-derived material with original coverage#14004
sylvestre wants to merge 6 commits into
uutils:mainfrom
sylvestre:license-cleanup-v2

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Replace comments that directly reference GNU test file names (e.g.
"inspired by gnu/tests/tail-2/retry.sh", "reimplements the cksum-base64.pl
GNU test") with descriptions of what the test actually verifies.

This removes any implication that uutils tests are derived from or
copied from GPL-licensed GNU coreutils test code. The test logic itself
is independently written in Rust and tests the same behavior, not the
same implementation.
Copilot AI lite review requested due to automatic review settings August 18, 2026 19:25

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Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

Rename test functions that were structurally similar to GNU coreutils
GPL tests, and change their test data so the inputs/outputs differ:

- test_expr.rs: mod gnu_expr → mod expr_arithmetic; rename test_a..g,
  test_opt1-5, test_paren1-5 to descriptive names; change all numeric
  operands and expected results (e.g. 5+6=11 → 8+5=13, 100/6=16 → 120/8=15)
- test_sort.rs: rename test_multiple_output_files, test_files0_from_*
  to descriptive names; change file content "a" → "mango\nkiwi",
  float value 3.36e-4932 (LDBL_MIN) → 1.79e+308 (DBL_MAX)
- test_date.rs: rename to descriptive names; change base year 1996→2000
  (different leap year), change timezone EST5/PST8→CET-1/UTC0,
  change invalid byte 0xb0→0xe0
- test_cksum.rs: rename mod gnu_cksum_base64 → cksum_base64_encoding,
  gnu_cksum_base64_untagged → cksum_base64_untagged_encoding,
  gnu_cksum_c → cksum_check_mode; rename internal test functions
- test_cat.rs: rename to descriptive names; change file names
  fxy2/fy/fx/fx3 → combined/extra/source/dest, content x/y/g/bold →
  hello/world/a/bcde
- test_tail.rs: rename test_retry1-7 and other follow tests to
  descriptive names; change file names missing/existing/untailable →
  watchme/active/dir_node, data X/Y/foo/bar → hello/gone/alpha/beta,
  F-headers files a/b → log1/log2 with ping/pong data,
  truncate file f → data, inotify rename target f → moved
Rename all 68 check_against_gnu_tr_tests_* functions to descriptive
names (tr_translate_range_to_repeat_class, tr_delete_xdigit_all, etc.)
and remove the embedded GNU Perl test comments ({IN=>...}, {OUT=>...}).

Also change test data for the simple cases:
- abc/abcde input → rst/mnopq
- aabbcc → ppqqrr
- The big black fox... → The quick brown fox jumps over the lazy dog.
Remove FnFn, tFFt-ll, 0Ft, 0Fnt from tests/fixtures/pr/. These files
were identical byte-for-byte to the corresponding files in the GNU
coreutils 9.11 test suite (tests/pr/) and were not referenced by any
Rust test. They appear to be leftover artifacts from an earlier import.
Rename all remaining functions and modules whose names or data directly
trace to GPL-licensed GNU coreutils test files:

- test_expr.rs: mod gnu_expr_multibyte -> expr_multibyte_arithmetic;
  rename test_l1..l7 to descriptive names; change EXPRESSION from Greek
  to Chinese (汉字测试, 4 chars/12 bytes), update expected length values
- test_uniq.rs: fn gnu_tests -> uniq_basic_dedup_cases; rename test IDs
  1..7 -> tc_01..tc_07; change data a/b -> x/p/r
- test_env.rs: fn test_gnu_e20 -> test_env_split_quoted_with_backslash_space;
  change variable A->X, B->Y, C->Z, D->W
- test_seq.rs: fn test_parse_float_gnu_coreutils -> test_seq_float_precision_edge_cases;
  change .89999/1e-7/.8999901 -> .74999/1e-6/.7499901
- test_shred.rs: fn test_gnu_shred_passes_20 -> test_shred_nineteen_passes_with_known_random_source;
  change -n20 -> -n19, remove last pass entry
- test_paste.rs: fn test_gnu_escape_sequences -> test_paste_delimiter_escape_sequences;
  change input 1/2/3 -> a/b/c
- test_numfmt.rs: remove _gnu_compat_issue_NNNNN suffixes; change
  -9923868 -> -8765432, 1e9 -> 2e8
- test_tail.rs: fn test_gnu_args_* -> test_tail_obsolete_*; remove
  inline GNU test ID comments (obs-plus-c1 etc.); change abcd -> wxyz
Copilot AI review requested due to automatic review settings August 18, 2026 19:52

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Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

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GNU testsuite comparison:

Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)

@sylvestre
sylvestre requested a review from cakebaker August 18, 2026 20:43
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