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directory rename detection: testcases to avoid taking detection too far

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Reviewed-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Elijah Newren 2018-04-19 10:57:50 -07:00 committed by Junio C Hamano
parent 509555d8ad
commit 21b53733a0
1 changed files with 153 additions and 0 deletions
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153
t/t6043-merge-rename-directories.sh
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@ -582,4 +582,157 @@ test_expect_success '2b-check: Directory split into two on one side, with equal
# messages are handled correctly.
###########################################################################
###########################################################################
# SECTION 3: Path in question is the source path for some rename already
#
# Combining cases from Section 1 and trying to handle them could lead to
# directory renaming detection being over-applied. So, this section
# provides some good testcases to check that the implementation doesn't go
# too far.
###########################################################################
# Testcase 3a, Avoid implicit rename if involved as source on other side
# (Related to testcases 1c and 1f)
# Commit O: z/{b,c,d}
# Commit A: z/{b,c,d} (no change)
# Commit B: y/{b,c}, x/d
# Expected: y/{b,c}, x/d
test_expect_success '3a-setup: Avoid implicit rename if involved as source on other side' '
test_create_repo 3a &&
(
cd 3a &&
mkdir z &&
echo b >z/b &&
echo c >z/c &&
echo d >z/d &&
git add z &&
test_tick &&
git commit -m "O" &&
git branch O &&
git branch A &&
git branch B &&
git checkout A &&
test_tick &&
git commit --allow-empty -m "A" &&
git checkout B &&
mkdir y &&
mkdir x &&
git mv z/b y/ &&
git mv z/c y/ &&
git mv z/d x/ &&
rmdir z &&
test_tick &&
git commit -m "B"
)
'
test_expect_success '3a-check: Avoid implicit rename if involved as source on other side' '
(
cd 3a &&
git checkout A^0 &&
git merge -s recursive B^0 &&
git ls-files -s >out &&
test_line_count = 3 out &&
git rev-parse >actual \
HEAD:y/b HEAD:y/c HEAD:x/d &&
git rev-parse >expect \
O:z/b O:z/c O:z/d &&
test_cmp expect actual
)
'
# Testcase 3b, Avoid implicit rename if involved as source on other side
# (Related to testcases 5c and 7c, also kind of 1e and 1f)
# Commit O: z/{b,c,d}
# Commit A: y/{b,c}, x/d
# Commit B: z/{b,c}, w/d
# Expected: y/{b,c}, CONFLICT:(z/d -> x/d vs. w/d)
# NOTE: We're particularly checking that since z/d is already involved as
# a source in a file rename on the same side of history, that we don't
# get it involved in directory rename detection. If it were, we might
# end up with CONFLICT:(z/d -> y/d vs. x/d vs. w/d), i.e. a
# rename/rename/rename(1to3) conflict, which is just weird.
test_expect_success '3b-setup: Avoid implicit rename if involved as source on current side' '
test_create_repo 3b &&
(
cd 3b &&
mkdir z &&
echo b >z/b &&
echo c >z/c &&
echo d >z/d &&
git add z &&
test_tick &&
git commit -m "O" &&
git branch O &&
git branch A &&
git branch B &&
git checkout A &&
mkdir y &&
mkdir x &&
git mv z/b y/ &&
git mv z/c y/ &&
git mv z/d x/ &&
rmdir z &&
test_tick &&
git commit -m "A" &&
git checkout B &&
mkdir w &&
git mv z/d w/ &&
test_tick &&
git commit -m "B"
)
'
test_expect_success '3b-check: Avoid implicit rename if involved as source on current side' '
(
cd 3b &&
git checkout A^0 &&
test_must_fail git merge -s recursive B^0 >out &&
test_i18ngrep CONFLICT.*rename/rename.*z/d.*x/d.*w/d out &&
test_i18ngrep ! CONFLICT.*rename/rename.*y/d out &&
git ls-files -s >out &&
test_line_count = 5 out &&
git ls-files -u >out &&
test_line_count = 3 out &&
git ls-files -o >out &&
test_line_count = 1 out &&
git rev-parse >actual \
:0:y/b :0:y/c :1:z/d :2:x/d :3:w/d &&
git rev-parse >expect \
O:z/b O:z/c O:z/d O:z/d O:z/d &&
test_cmp expect actual &&
test_path_is_missing z/d &&
git hash-object >actual \
x/d w/d &&
git rev-parse >expect \
O:z/d O:z/d &&
test_cmp expect actual
)
'
###########################################################################
# Rules suggested by section 3:
#
# Avoid directory-rename-detection for a path, if that path is the source
# of a rename on either side of a merge.
###########################################################################
test_done