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git/t/t3035-merge-sparse.sh
SZEDER Gábor 1c5e94f459 tests: use 'test_must_be_empty' instead of 'test_cmp <empty> <out>'
Using 'test_must_be_empty' is shorter and more idiomatic than

  >empty &&
  test_cmp empty out

as it saves the creation of an empty file.  Furthermore, sometimes the
expected empty file doesn't have such a descriptive name like 'empty',
and its creation is far away from the place where it's finally used
for comparison (e.g. in 't7600-merge.sh', where two expected empty
files are created in the 'setup' test, but are used only about 500
lines later).

These cases were found by instrumenting 'test_cmp' to error out the
test script when it's used to compare empty files, and then converted
manually.

Note that even after this patch there still remain a lot of cases
where we use 'test_cmp' to check empty files:

  - Sometimes the expected output is not hard-coded in the test, but
    'test_cmp' is used to ensure that two similar git commands produce
    the same output, and that output happens to be empty, e.g. the
    test 'submodule update --merge  - ignores --merge  for new
    submodules' in 't7406-submodule-update.sh'.

  - Repetitive common tasks, including preparing the expected results
    and running 'test_cmp', are often extracted into a helper
    function, and some of this helper's callsites expect no output.

  - For the same reason as above, the whole 'test_expect_success'
    block is within a helper function, e.g. in 't3070-wildmatch.sh'.

  - Or 'test_cmp' is invoked in a loop, e.g. the test 'cvs update
    (-p)' in 't9400-git-cvsserver-server.sh'.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-21 11:48:36 -07:00

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#!/bin/sh
test_description='merge with sparse files'
. ./test-lib.sh
# test_file $filename $content
test_file () {
echo "$2" > "$1" &&
git add "$1"
}
# test_commit_this $message_and_tag
test_commit_this () {
git commit -m "$1" &&
git tag "$1"
}
test_expect_success 'setup' '
test_file checked-out init &&
test_file modify_delete modify_delete_init &&
test_commit_this init &&
test_file modify_delete modify_delete_theirs &&
test_commit_this theirs &&
git reset --hard init &&
git rm modify_delete &&
test_commit_this ours &&
git config core.sparseCheckout true &&
echo "/checked-out" >.git/info/sparse-checkout &&
git reset --hard &&
! git merge theirs
'
test_expect_success 'reset --hard works after the conflict' '
git reset --hard
'
test_expect_success 'is reset properly' '
git status --porcelain -- modify_delete >out &&
test_must_be_empty out &&
test_path_is_missing modify_delete
'
test_expect_success 'setup: conflict back' '
! git merge theirs
'
test_expect_success 'Merge abort works after the conflict' '
git merge --abort
'
test_expect_success 'is aborted properly' '
git status --porcelain -- modify_delete >out &&
test_must_be_empty out &&
test_path_is_missing modify_delete
'
test_done