tests calling date command set env LC_ALL

[jtmoon79]

For tests calling date Unix tool, also set
environment variable LC_ALL=c to make more sure to avoid locality problems.

On systems with environment variable and value LC_ALL=en_US.utf8 set then the test try_verify_against_date_command_format may fail.

$ LC_ALL=en_US.utf8 cargo test
...
test try_verify_against_date_command_format ... FAILED
test try_verify_against_date_command ... ok

failures:

---- try_verify_against_date_command_format stdout ----
LANG: "en_US.UTF-8"
command: "/usr/bin/date" --version
stdout: "date (GNU coreutils) 8.32\nCopyright (C) 2020 Free Software Foundation, Inc.\nLicense GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>.\nThis is free software: you are free to change and redistribute it.\nThere is NO WARRANTY, to the extent permitted by law.\n\nWritten by David MacKenzie.\n"
stderr: ""
thread 'try_verify_against_date_command_format' panicked at 'assertion failed: `(left == right)`
  left: `"d01 D01/01/70 F1970-01-01 H12 I12 j001 k12 l12 m01 M11 S13 T12:11:13 u4 U00 w4 W00 X12:11:13 PM y70 Y1970 z-08:00\n"`,
 right: `"d01 D01/01/70 F1970-01-01 H12 I12 j001 k12 l12 m01 M11 S13 T12:11:13 u4 U00 w4 W00 X12:11:13 y70 Y1970 z-08:00\n"`', tests/dateutils.rs:144:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

This failure occurred on Ubuntu 22.04, rust 1.72.0, date date (GNU coreutils) 8.32.

PR #1090 sets environment variable LANG=c. Apparently that is not always sufficient.

Relates to Issue #1060, PR #1090

[codecov]

Codecov Report

Merging #1315 (9087a17) into 0.4.x (a47e0e3) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            0.4.x    #1315   +/-   ##
=======================================
  Coverage   91.24%   91.24%           
=======================================
  Files          38       38           
  Lines       17062    17062           
=======================================
  Hits        15568    15568           
  Misses       1494     1494           

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[pitdicker]

I would like to run a quick test locally before approving (later today or tomorrow, when near a Linux pc).

An alternative to setting the locale is to use format_localized and test the unstable-locales feature while at it.