Start preparing merge-related tests to work with multiple merge backends

This series starts preparing the merge related tests to work with multiple
backends: merge-recursive or merge-ort. Further work will be coming.

Changes since v2:

* fix typos pointed out by Eric
* reworded another commit message for clarify

The greater flexibility patches at the end of the series also previews some of the design changes being brought by merge-ort.

Merges cleanly with next and seen, despite the pile of testcase renames.

Elijah Newren (11):
Collect merge-related tests to t64xx
t6418: tighten delete/normalize conflict testcase
t6422: fix bad check against missing file
t6416, t6422: fix incorrect untracked file count
t6423: fix test setup for a couple tests
t6422: fix multiple errors with the mod6 test expectations t6416, t6423: clarify some comments and fix some typos
t6423: add an explanation about why one of the tests does not pass t6422, t6426: be more flexible for add/add conflicts involving renames t642[23]: be more flexible for add/add conflicts involving pair
renames
t6425: be more flexible with rename/delete conflict messages

 t/{t6020-merge-df.sh => t6400-merge-df.sh}    |  0
 ...ss-cross.sh => t6401-merge-criss-cross.sh} |  0
 ...-merge-rename.sh => t6402-merge-rename.sh} |  0
 ...6023-merge-file.sh => t6403-merge-file.sh} |  0
 ...sive-merge.sh => t6404-recursive-merge.sh} |  0
 ...ge-symlinks.sh => t6405-merge-symlinks.sh} |  0
 ...6026-merge-attr.sh => t6406-merge-attr.sh} |  0
 ...-merge-binary.sh => t6407-merge-binary.sh} |  0
 ...p-to-date.sh => t6408-merge-up-to-date.sh} |  0
 ...erge-subtree.sh => t6409-merge-subtree.sh} |  0
 ...ge-filemode.sh => t6411-merge-filemode.sh} |  0
 ...-rename.sh => t6412-merge-large-rename.sh} |  0
 ...6033-merge-crlf.sh => t6413-merge-crlf.sh} |  0
 ...cruft.sh => t6414-merge-rename-nocruft.sh} |  0
 ...mlink.sh => t6415-merge-dir-to-symlink.sh} |  0
 ...ses.sh => t6416-recursive-corner-cases.sh} |  4 +-
 ...s-theirs.sh => t6417-merge-ours-theirs.sh} |  0
 ...-text-auto.sh => t6418-merge-text-auto.sh} |  3 +-
 ...gnorecase.sh => t6419-merge-ignorecase.sh} |  0
 ....sh => t6422-merge-rename-corner-cases.sh} | 68 +++++++++++--------
 ...s.sh => t6423-merge-rename-directories.sh} | 39 +++++++----
 ...=> t6424-merge-unrelated-index-changes.sh} |  0
 ...delete.sh => t6425-merge-rename-delete.sh} |  3 +-
 ...h => t6426-merge-skip-unneeded-updates.sh} |  2 +-
 ...ers.sh => t6427-diff3-conflict-markers.sh} |  0
 ...-recursive.sh => t6430-merge-recursive.sh} |  0
 ...-criscross.sh => t6431-merge-criscross.sh} |  0
 ...=> t6432-merge-recursive-space-options.sh} |  0
 ...ge-toplevel.sh => t6433-merge-toplevel.sh} |  0
 ...> t6434-merge-recursive-rename-options.sh} |  0
 ...-merge-sparse.sh => t6435-merge-sparse.sh} |  0
 ...-overwrite.sh => t6436-merge-overwrite.sh} |  0
 ...dule-merge.sh => t6437-submodule-merge.sh} |  0
 ...438-submodule-directory-file-conflicts.sh} |  0
 ...r-msgs.sh => t6439-merge-co-error-msgs.sh} |  0
 35 files changed, 71 insertions(+), 48 deletions(-)
 rename t/{t6020-merge-df.sh => t6400-merge-df.sh} (100%)
 rename t/{t6021-merge-criss-cross.sh => t6401-merge-criss-cross.sh} (100%)
 rename t/{t6022-merge-rename.sh => t6402-merge-rename.sh} (100%)
 rename t/{t6023-merge-file.sh => t6403-merge-file.sh} (100%)
 rename t/{t6024-recursive-merge.sh => t6404-recursive-merge.sh} (100%)
 rename t/{t6025-merge-symlinks.sh => t6405-merge-symlinks.sh} (100%)
 rename t/{t6026-merge-attr.sh => t6406-merge-attr.sh} (100%)
 rename t/{t6027-merge-binary.sh => t6407-merge-binary.sh} (100%)
 rename t/{t6028-merge-up-to-date.sh => t6408-merge-up-to-date.sh} (100%)
 rename t/{t6029-merge-subtree.sh => t6409-merge-subtree.sh} (100%)
 rename t/{t6031-merge-filemode.sh => t6411-merge-filemode.sh} (100%)
 rename t/{t6032-merge-large-rename.sh => t6412-merge-large-rename.sh} (100%)
 rename t/{t6033-merge-crlf.sh => t6413-merge-crlf.sh} (100%)
 rename t/{t6034-merge-rename-nocruft.sh => t6414-merge-rename-nocruft.sh} (100%)
 rename t/{t6035-merge-dir-to-symlink.sh => t6415-merge-dir-to-symlink.sh} (100%)
 rename t/{t6036-recursive-corner-cases.sh => t6416-recursive-corner-cases.sh} (99%)
 rename t/{t6037-merge-ours-theirs.sh => t6417-merge-ours-theirs.sh} (100%)
 rename t/{t6038-merge-text-auto.sh => t6418-merge-text-auto.sh} (99%)
 rename t/{t6039-merge-ignorecase.sh => t6419-merge-ignorecase.sh} (100%)
 rename t/{t6042-merge-rename-corner-cases.sh => t6422-merge-rename-corner-cases.sh} (94%)
 rename t/{t6043-merge-rename-directories.sh => t6423-merge-rename-directories.sh} (98%)
 rename t/{t6044-merge-unrelated-index-changes.sh => t6424-merge-unrelated-index-changes.sh} (100%)
 rename t/{t6045-merge-rename-delete.sh => t6425-merge-rename-delete.sh} (72%)
 rename t/{t6046-merge-skip-unneeded-updates.sh => t6426-merge-skip-unneeded-updates.sh} (99%)
 rename t/{t6047-diff3-conflict-markers.sh => t6427-diff3-conflict-markers.sh} (100%)
 rename t/{t3030-merge-recursive.sh => t6430-merge-recursive.sh} (100%)
 rename t/{t3031-merge-criscross.sh => t6431-merge-criscross.sh} (100%)
 rename t/{t3032-merge-recursive-space-options.sh => t6432-merge-recursive-space-options.sh} (100%)
 rename t/{t3033-merge-toplevel.sh => t6433-merge-toplevel.sh} (100%)
 rename t/{t3034-merge-recursive-rename-options.sh => t6434-merge-recursive-rename-options.sh} (100%)
 rename t/{t3035-merge-sparse.sh => t6435-merge-sparse.sh} (100%)
 rename t/{t7607-merge-overwrite.sh => t6436-merge-overwrite.sh} (100%)
 rename t/{t7405-submodule-merge.sh => t6437-submodule-merge.sh} (100%)
 rename t/{t7613-merge-submodule.sh => t6438-submodule-directory-file-conflicts.sh} (100%)
 rename t/{t7609-merge-co-error-msgs.sh => t6439-merge-co-error-msgs.sh} (100%)

base-commit: 4f0a8be78499454eac3985b6e7e144b8376ab0a5
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-827%2Fnewren%2Fmerge-test-rename-v3
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-827/newren/merge-test-rename-v3
Pull-Request: https://github.com/git/git/pull/827

Range-diff vs v2:

  1:  3a2b7e9743 =  1:  8fec657942 Collect merge-related tests to t64xx
  2:  621c9a159e =  2:  b35b61007e t6418: tighten delete/normalize conflict testcase
  3:  7f408b7d40 =  3:  d35d4b1922 t6422: fix bad check against missing file
  4:  9ce80f2f94 !  4:  78df85aee5 t6416, t6422: fix incorrect untracked file count

@@ Metadata
## Commit message ##
t6416, t6422: fix incorrect untracked file count

- Apparently I don't know how to count untracked files, and since the tests
- in question were marked as test_expect_failure, no one every noticed it
- until know. Correct the count, as these tests clearly creates three
- untracked files ('out', 'err', and 'file_count').
+ Apparently I don't know how to count untracked files, and since the
+ tests in question were marked as test_expect_failure, no one ever
+ noticed it until now. Correct the count, as these tests clearly create
+ three untracked files ('out', 'err', and 'file_count').

(I believe this problem arose because earlier incarnations counted lines via a pipe to 'wc -l'. Reviewers asked that it be replaced by writing

  5:  382d65649d =  5:  8ac78dc71b t6423: fix test setup for a couple tests
  6:  56e169b1d8 =  6:  6674ae9de4 t6422: fix multiple errors with the mod6 test expectations
  7:  7b534d123a =  7:  783ebb6576 t6416, t6423: clarify some comments and fix some typos
  8:  f2d7e744fc !  8:  82e1b0e696 t6423: add an explanation about why one of the tests does not pass

@@ Metadata
## Commit message ##
t6423: add an explanation about why one of the tests does not pass

- While we're at it, document why one of the two tests doesn't pass (since
- I had long since forgotten it)...though the reasoning makes me question
- why it's considered a failure at all. Maybe I had a good reason when I
- introduced it, or maybe I just wasn't looking at it clearly? Either
- way, the explanation may help a future reader.
+ I had long since forgotten the idea behind this test and why it failed,
+ and took a little while to figure it out. To prevent others from having
+ to spend a similar time on it, add an explanation in the comments.
+ However, the reasoning in the explanation makes me question why I
+ considered it a failure at all. I'm not sure if I had a better reason
+ when I originally wrote it, but for now just add commentary about the
+ possible expectations and why it behaves the way it does right now.

  9:  b4e165eca4 =  9:  42e3f699f1 t6422, t6426: be more flexible for add/add conflicts involving renames
 10:  a9a02a0ca5 = 10:  456160f3a7 t642[23]: be more flexible for add/add conflicts involving pair renames
 11:  38f6573511 = 11:  0c8dcbf01c t6425: be more flexible with rename/delete conflict messages

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