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[PATCH] Add the merge test Linus called "test script from hell".
This is an adaptation to the test framework of a historic test that was used before three way merge form of read-tree was introduced, and subsequently used to validate the read-tree -m merge works correctly. It covers all the tricky cases known back then and also have been updated to cover conflicting files/directories cases since then. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Petr Baudis <pasky@ucw.cz>
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Junio C Hamano
Petr Baudis
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1bb4624417
commit
2ecd90502f
313
t/t1000-read-tree-m-3way.sh
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313
t/t1000-read-tree-m-3way.sh
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#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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test_description='Three way merge with read-tree -m
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This test tries three-way merge with read-tree -m
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There is one ancestor (called O for Original) and two branches A
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and B derived from it. We want to do a 3-way merge between A and
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B, using O as the common ancestor.
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merge A O B
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Decisions are made by comparing contents of O, A and B pathname
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by pathname. The result is determined by the following guiding
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principle:
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- If only A does something to it and B does not touch it, take
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whatever A does.
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- If only B does something to it and A does not touch it, take
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whatever B does.
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- If both A and B does something but in the same way, take
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whatever they do.
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- If A and B does something but different things, we need a
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3-way merge:
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- We cannot do anything about the following cases:
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* O does not have it. A and B both must be adding to the
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same path independently.
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* A deletes it. B must be modifying.
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- Otherwise, A and B are modifying. Run 3-way merge.
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First, the case matrix.
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- Vertical axis is for A'\''s actions.
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- Horizontal axis is for B'\''s actions.
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.----------------------------------------------------------------.
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| A B | No Action | Delete | Modify | Add |
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|------------+------------+------------+------------+------------|
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| No Action | | | | |
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| | select O | delete | select B | select B |
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| | | | | |
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|------------+------------+------------+------------+------------|
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| Delete | | | ********** | can |
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| | delete | delete | merge | not |
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| | | | | happen |
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|------------+------------+------------+------------+------------|
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| Modify | | ********** | ?????????? | can |
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| | select A | merge | select A=B | not |
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| | | | merge | happen |
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|------------+------------+------------+------------+------------|
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| Add | | can | can | ?????????? |
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| | select A | not | not | select A=B |
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| | | happen | happen | merge |
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.----------------------------------------------------------------.
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In addition:
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SS: a special case of MM, where A and B makes the same modification.
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LL: a special case of AA, where A and B creates the same file.
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TT: a special case of MM, where A and B makes mergeable changes.
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DF: a special case, where A makes a directory and B makes a file.
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'
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. ./test-lib.sh
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# Original tree.
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mkdir Z
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for a in N D M
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do
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for b in N D M
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do
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p=$a$b
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echo This is $p from the original tree. >$p
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echo This is Z/$p from the original tree. >Z/$p
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test_expect_success \
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"adding test file $p and Z/$p" \
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'git-update-cache --add $p &&
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git-update-cache --add Z/$p'
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done
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done
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echo This is SS from the original tree. >SS
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test_expect_success \
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'adding test file SS' \
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'git-update-cache --add SS'
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cat >TT <<\EOF
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This is a trivial merge sample text.
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Branch A is expected to upcase this word, here.
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There are some filler lines to avoid diff context
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conflicts here,
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like this one,
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and this one,
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and this one is yet another one of them.
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At the very end, here comes another line, that is
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the word, expected to be upcased by Branch B.
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This concludes the trivial merge sample file.
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EOF
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test_expect_success \
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'adding test file TT' \
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'git-update-cache --add TT'
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test_expect_success \
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'prepare initial tree' \
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'tree_O=$(git-write-tree)'
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test_expect_success \
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'commit initial tree' \
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'commit_O=$(echo "Original tree for the merge test." |
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git-commit-tree $tree_O)'
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echo $commit_O >.git/HEAD-O
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################################################################
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# Branch A and B makes the changes according to the above matrix.
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################################################################
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# Branch A
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to_remove=$(echo D? Z/D?)
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rm -f $to_remove
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test_expect_success \
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'change in branch A (removal)' \
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'git-update-cache --remove $to_remove'
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for p in M? Z/M?
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do
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echo This is modified $p in the branch A. >$p
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test_expect_success \
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'change in branch A (modification)' \
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"git-update-cache $p"
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done
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for p in AN AA Z/AN Z/AA
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do
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echo This is added $p in the branch A. >$p
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test_expect_success \
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'change in branch A (addition)' \
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"git-update-cache --add $p"
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done
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echo This is SS from the modified tree. >SS
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echo This is LL from the modified tree. >LL
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test_expect_success \
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'change in branch A (addition)' \
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'git-update-cache --add LL &&
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git-update-cache SS'
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mv TT TT-
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sed -e '/Branch A/s/word/WORD/g' <TT- >TT
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rm -f TT-
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test_expect_success \
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'change in branch A (edit)' \
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'git-update-cache TT'
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mkdir DF
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echo Branch A makes a file at DF/DF, creating a directory DF. >DF/DF
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test_expect_success \
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'change in branch A (change file to directory)' \
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'git-update-cache --add DF/DF'
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test_expect_success \
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'recording branch A tree' \
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'tree_A=$(git-write-tree)'
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test_expect_success \
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'committing branch A changes' \
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'commit_A=$(echo "Branch A for the merge test." |
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git-commit-tree $tree_A -p $commit_O)'
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echo $commit_A >.git/HEAD-A
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################################################################
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# Branch B
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# Start from O
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rm -rf [NDMASLT][NDMASLT] Z DF
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mkdir Z
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test_expect_success \
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'reading original tree and checking out' \
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'git-read-tree $tree_O &&
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git-checkout-cache -a'
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to_remove=$(echo ?D Z/?D)
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rm -f $to_remove
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test_expect_success \
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'change in branch B (removal)' \
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"git-update-cache --remove $to_remove"
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for p in ?M Z/?M
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do
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echo This is modified $p in the branch B. >$p
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test_expect_success \
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'change in branch B (modification)' \
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"git-update-cache $p"
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done
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for p in NA AA Z/NA Z/AA
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do
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echo This is added $p in the branch B. >$p
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test_expect_success \
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'change in branch B (addition)' \
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"git-update-cache --add $p"
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done
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echo This is SS from the modified tree. >SS
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echo This is LL from the modified tree. >LL
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test_expect_success \
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'change in branch B (addition and modification)' \
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'git-update-cache --add LL &&
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git-update-cache SS'
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mv TT TT-
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sed -e '/Branch B/s/word/WORD/g' <TT- >TT
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rm -f TT-
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test_expect_success \
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'change in branch B (modification)' \
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'git-update-cache TT'
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echo Branch B makes a file at DF. >DF
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test_expect_success \
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'change in branch B (addition of a file to conflict with directory)' \
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'git-update-cache --add DF'
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test_expect_success \
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'recording branch B tree' \
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'tree_B=$(git-write-tree)'
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test_expect_success \
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'committing branch B changes' \
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'commit_B=$(echo "Branch B for the merge test." |
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git-commit-tree $tree_B -p $commit_O)'
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echo $commit_B >.git/HEAD-B
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################################################################
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# Done preparation.
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test_debug '
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for T in O A B
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do
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echo "# $T $(eval git-cat-file commit \$commit_$T | sed -e 1q)"
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done
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'
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################################################################
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# Try merging and showing the various diffs
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test_expect_success \
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'3-way merge with git-read-tree -m' \
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"git-read-tree -m $tree_O $tree_A $tree_B"
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strip_object_id='s/^\([0-7]*\) [0-9a-f]* \([0-3].*\)$/\1 \2/'
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test_expect_success \
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'git-ls-files --stage of the merge result' \
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'git-ls-files --stage >current- &&
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sed -e "$strip_object_id" <current- >current'
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cat >expected <<\EOF
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100644 2 AA
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100644 3 AA
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100644 2 AN
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100644 1 DD
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100644 3 DF
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100644 2 DF/DF
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100644 1 DM
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100644 3 DM
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100644 1 DN
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100644 3 DN
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100644 2 LL
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100644 3 LL
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100644 1 MD
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100644 2 MD
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100644 1 MM
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100644 2 MM
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100644 3 MM
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100644 0 MN
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100644 3 NA
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100644 1 ND
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100644 2 ND
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100644 0 NM
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100644 0 NN
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100644 0 SS
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100644 1 TT
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100644 2 TT
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100644 3 TT
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100644 2 Z/AA
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100644 3 Z/AA
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100644 2 Z/AN
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100644 1 Z/DD
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100644 1 Z/DM
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100644 3 Z/DM
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100644 1 Z/DN
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100644 3 Z/DN
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100644 1 Z/MD
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100644 2 Z/MD
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100644 1 Z/MM
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100644 2 Z/MM
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100644 3 Z/MM
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100644 0 Z/MN
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100644 3 Z/NA
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100644 1 Z/ND
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100644 2 Z/ND
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100644 0 Z/NM
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100644 0 Z/NN
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EOF
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test_expect_success \
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'validate merge result' \
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'diff current expected'
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test_done
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