[PATCH 00/13] format-patch: clean up tests and documentation

*** BLURB HERE ***

As one of the older parts of the Git, the tests and documentation for format-patch have been needing cleanup for a while. Let's do that in this patchset!

This patchset is based on v3 of "format-patch: learn --infer-cover-subject option (also t4014 cleanup)"[1].

Changes since v3 of "format-patch: learn --infer-cover-subject option (also t4014 cleanup)":

* Squash in Junio's and Hannes' suggestions

* Add 't4014: let sed open its own files'

[1]: https://public-inbox.org/git/xmqqwof3ljcz.fsf@gitster-ct.c.googlers.com/T/#m19570aff4828dfbd65d57cacf231c2938af1dc9f

Denton Liu (13):
  t4014: drop unnecessary blank lines from test cases
  t4014: s/expected/expect/
  t4014: move closing sq onto its own line
  t4014: use sq for test case names
  t4014: remove spaces after redirect operators
  t4014: use indentable here-docs
  t4014: drop redirections to /dev/null
  t4014: let sed open its own files
  t4014: use test_line_count() where possible
  t4014: remove confusing pipe in check_threading()
  t4014: stop losing return codes of git commands
  Doc: add more detail for git-format-patch
  config/format.txt: specify default value of format.coverLetter

 Documentation/config/format.txt    |   1 +
 Documentation/git-format-patch.txt |  23 +-
 t/t4014-format-patch.sh            | 814 ++++++++++++++---------------
 3 files changed, 421 insertions(+), 417 deletions(-)

Range-diff:
 1:  fb000bfca2 =  1:  fb000bfca2 t4014: drop unnecessary blank lines from test cases
 2:  568b3a03a0 !  2:  0a5ce9b95f t4014: s/expected/expect/
    @@ Commit message
         t4014: s/expected/expect/
     
         For test cases, the usual convention is to name expected output files
    -    "expect", not "expected". Replace all instances with "expected" with
    +    "expect", not "expected". Replace all instances of "expected" with
         "expect" except for one case where the "expected" is used as the name
         of a test case.
     
 3:  a205a920bd =  3:  5c49703aa4 t4014: move closing sq onto its own line
 4:  66bf2e3dd4 =  4:  02a11147fd t4014: use sq for test case names
 5:  6f1371275e =  5:  8d9791c061 t4014: remove spaces after redirect operators
 6:  b4295846f5 =  6:  90ad0fcf70 t4014: use indentable here-docs
 7:  34315412c8 =  7:  804b3163f8 t4014: drop redirections to /dev/null
 -:  ---------- >  8:  7d9a24a979 t4014: let sed open its own files
 8:  de08dd886d =  9:  d068d42098 t4014: use test_line_count() where possible
 9:  dec5a62e82 = 10:  6a9409cee0 t4014: remove confusing pipe in check_threading()
10:  64069c0c54 ! 11:  c580ce447b t4014: stop losing return codes of git commands
    @@ t/t4014-format-patch.sh: test_expect_success 'format-patch --ignore-if-in-upstre
      
     -git_version="$(git --version | sed "s/.* //")"
     +test_expect_success 'get git version' '
    -+	git_version="$(git --version | sed "s/.* //")"
    ++	git_version=$(git --version) &&
    ++	git_version=${git_version##* }
     +'
      
      signature() {
11:  c12534ab5d = 12:  a97f861e6a Doc: add more detail for git-format-patch
12:  a08273ebcc <  -:  ---------- config/format.txt: specify default value of format.coverLetter
13:  de599f7ca9 <  -:  ---------- format-patch: learn --infer-cover-subject option
 -:  ---------- > 13:  7c8522abf2 config/format.txt: specify default value of format.coverLetter