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git/t/t4008-diff-break-rewrite.sh
Ævar Arnfjörð Bjarmason 15b808da74 "lib-diff" tests: make "README" and "COPYING" test data smaller 
Follow-up the change in 459b8d22e5 (tests: do not borrow from COPYING
and README from the real source, 2015-02-15) by not shipping a full
copy of older versions of the top-level "COPYING" and "README" files.

The tests that use them just need the small blurb at the top of
"COPYING" as test data, or mock data that's dissimilar. Let's provide
that with a "COPYING_test_data" function instead.

We're not replacing this with some other generic test
data (e.g. "lorum ipsum") because these tests require test file header
to be the old "COPYING" file. See e.g. "t4003-diff-rename-1.sh" which
changes the file, and then does full "test_cmp" comparisons on the
resulting "git diff" output.

This change only changes tests that used the "lib-diff.sh" library,
but splits up what they need into a new "lib-diff-data.sh". A
subsequent commit will change related tests that were missed in
459b8d22e5.

For the test in "t4008-diff-break-rewrite.sh" the "README" file can go
away in favor of echoing the line "some dissimilar content" to a file
in the one test that needed it.

The point of that test is to start with files "A" and "B", and then
have A be more similar to the state of "B" than to its old version (by
copying over the content from the "COPYING" file). Just comparing the
pre-image of "some dissimilar content" and later a munged version of
the "COPYING" output serves that purpose.

While we're at it get rid of a stray "echo $tree" debugging line added
in 15d061b435 ([PATCH] Fix the way diffcore-rename records unremoved
source., 2005-05-27), and stop calling "hash-object" to get the hash
of an object we've just added to the index. We can instead extract
that information from the index itself with "rev-parse".

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-10-15 09:36:46 -07:00

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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
test_description='Break and then rename
We have two very different files, file0 and file1, registered in a tree.
We update file1 so drastically that it is more similar to file0, and
then remove file0. With -B, changes to file1 should be broken into
separate delete and create, resulting in removal of file0, removal of
original file1 and creation of completely rewritten file1. The latter
two are then merged back into a single "complete rewrite".
Further, with -B and -M together, these three modifications should
turn into rename-edit of file0 into file1.
Starting from the same two files in the tree, we swap file0 and file1.
With -B, this should be detected as two complete rewrites.
Further, with -B and -M together, these should turn into two renames.
'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
test_expect_success setup '
echo some dissimilar content >file0 &&
COPYING_test_data >file1 &&
blob0_id=$(git hash-object file0) &&
blob1_id=$(git hash-object file1) &&
git update-index --add file0 file1 &&
git tag reference $(git write-tree)
'
test_expect_success 'change file1 with copy-edit of file0 and remove file0' '
sed -e "s/git/GIT/" file0 >file1 &&
blob2_id=$(git hash-object file1) &&
rm -f file0 &&
git update-index --remove file0 file1
'
test_expect_success 'run diff with -B (#1)' '
git diff-index -B --cached reference >current &&
cat >expect <<-EOF &&
:100644 000000 $blob0_id $ZERO_OID D file0
:100644 100644 $blob1_id $blob2_id M100 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'run diff with -B and -M (#2)' '
git diff-index -B -M reference >current &&
cat >expect <<-EOF &&
:100644 100644 $blob0_id $blob2_id R100 file0 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'swap file0 and file1' '
rm -f file0 file1 &&
git read-tree -m reference &&
git checkout-index -f -u -a &&
mv file0 tmp &&
mv file1 file0 &&
mv tmp file1 &&
git update-index file0 file1
'
test_expect_success 'run diff with -B (#3)' '
git diff-index -B reference >current &&
cat >expect <<-EOF &&
:100644 100644 $blob0_id $blob1_id M100 file0
:100644 100644 $blob1_id $blob0_id M100 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'run diff with -B and -M (#4)' '
git diff-index -B -M reference >current &&
cat >expect <<-EOF &&
:100644 100644 $blob1_id $blob1_id R100 file1 file0
:100644 100644 $blob0_id $blob0_id R100 file0 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'make file0 into something completely different' '
rm -f file0 &&
test_ln_s_add frotz file0 &&
slink_id=$(printf frotz | git hash-object --stdin) &&
git update-index file1
'
test_expect_success 'run diff with -B (#5)' '
git diff-index -B reference >current &&
cat >expect <<-EOF &&
:100644 120000 $blob0_id $slink_id T file0
:100644 100644 $blob1_id $blob0_id M100 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'run diff with -B -M (#6)' '
git diff-index -B -M reference >current &&
# file0 changed from regular to symlink. file1 is the same as the preimage
# of file0. Because the change does not make file0 disappear, file1 is
# denoted as a copy of file0
cat >expect <<-EOF &&
:100644 120000 $blob0_id $slink_id T file0
:100644 100644 $blob0_id $blob0_id C file0 file1
EOF
compare_diff_raw expect current
'
test_expect_success 'run diff with -M (#7)' '
git diff-index -M reference >current &&
# This should not mistake file0 as the copy source of new file1
# due to type differences.
cat >expect <<-EOF &&
:100644 120000 $blob0_id $slink_id T file0
:100644 100644 $blob1_id $blob0_id M file1
EOF
compare_diff_raw expect current
'
test_expect_success 'file1 edited to look like file0 and file0 rename-edited to file2' '
rm -f file0 file1 &&
git read-tree -m reference &&
git checkout-index -f -u -a &&
sed -e "s/git/GIT/" file0 >file1 &&
sed -e "s/git/GET/" file0 >file2 &&
blob3_id=$(git hash-object file2) &&
rm -f file0 &&
git update-index --add --remove file0 file1 file2
'
test_expect_success 'run diff with -B (#8)' '
git diff-index -B reference >current &&
cat >expect <<-EOF &&
:100644 000000 $blob0_id $ZERO_OID D file0
:100644 100644 $blob1_id $blob2_id M100 file1
:000000 100644 $ZERO_OID $blob3_id A file2
EOF
compare_diff_raw expect current
'
test_expect_success 'run diff with -B -C (#9)' '
git diff-index -B -C reference >current &&
cat >expect <<-EOF &&
:100644 100644 $blob0_id $blob2_id C095 file0 file1
:100644 100644 $blob0_id $blob3_id R095 file0 file2
EOF
compare_diff_raw expect current
'
test_done
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