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git/t/t4214-log-graph-octopus.sh
Denton Liu 11c21f22de t4214: demonstrate octopus graph coloring failure 
The graph coloring logic for octopus merges currently has a bug. This
can be seen git.git with 74c7cfa875 (Merge of
http://members.cox.net/junkio/git-jc.git, 2005-05-05), whose second
child is 211232bae6 (Octopus merge of the following five patches.,
2005-05-05).

If one runs

	git log --graph 74c7cfa875

one can see that the octopus merge is colored incorrectly. In
particular, the horizontal dashes are off by one color. Each horizontal
dash should be the color of the line to their bottom-right. Instead, they
are currently the color of the line to their bottom.

Demonstrate this breakage with a few sets of test cases. These test
cases should show not only simple cases of the bug occuring but trickier
situations that may not be handled properly in any attempt to fix the
bug.

While we're at it, include a passing test case as a canary in case an
attempt to fix the bug breaks existing operation.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-10-04 09:28:01 +09:00

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#!/bin/sh
test_description='git log --graph of skewed left octopus merge.'
. ./test-lib.sh
test_expect_success 'set up merge history' '
test_commit initial &&
for i in 1 2 3 4 ; do
git checkout master -b $i || return $?
# Make tag name different from branch name, to avoid
# ambiguity error when calling checkout.
test_commit $i $i $i tag$i || return $?
done &&
git checkout 1 -b merge &&
test_merge octopus-merge 1 2 3 4 &&
test_commit after-merge &&
git checkout 1 -b L &&
test_commit left &&
git checkout 4 -b crossover &&
test_commit after-4 &&
git checkout initial -b more-L &&
test_commit after-initial
'
test_expect_success 'log --graph with tricky octopus merge, no color' '
cat >expect.uncolored <<-\EOF &&
* left
| *---. octopus-merge
| |\ \ \
|/ / / /
| | | * 4
| | * | 3
| | |/
| * | 2
| |/
* | 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s left octopus-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_success 'log --graph with tricky octopus merge with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* left
<RED>|<RESET> *<BLUE>-<RESET><BLUE>-<RESET><MAGENTA>-<RESET><MAGENTA>.<RESET> octopus-merge
<RED>|<RESET> <RED>|<RESET><YELLOW>\<RESET> <BLUE>\<RESET> <MAGENTA>\<RESET>
<RED>|<RESET><RED>/<RESET> <YELLOW>/<RESET> <BLUE>/<RESET> <MAGENTA>/<RESET>
<RED>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> * 4
<RED>|<RESET> <YELLOW>|<RESET> * <MAGENTA>|<RESET> 3
<RED>|<RESET> <YELLOW>|<RESET> <MAGENTA>|<RESET><MAGENTA>/<RESET>
<RED>|<RESET> * <MAGENTA>|<RESET> 2
<RED>|<RESET> <MAGENTA>|<RESET><MAGENTA>/<RESET>
* <MAGENTA>|<RESET> 1
<MAGENTA>|<RESET><MAGENTA>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s left octopus-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
# Repeat the previous two tests with "normal" octopus merge (i.e.,
# without the first parent skewing to the "left" branch column).
test_expect_success 'log --graph with normal octopus merge, no color' '
cat >expect.uncolored <<-\EOF &&
*---. octopus-merge
|\ \ \
| | | * 4
| | * | 3
| | |/
| * | 2
| |/
* | 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s octopus-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_success 'log --graph with normal octopus merge with colors' '
cat >expect.colors <<-\EOF &&
*<YELLOW>-<RESET><YELLOW>-<RESET><BLUE>-<RESET><BLUE>.<RESET> octopus-merge
<RED>|<RESET><GREEN>\<RESET> <YELLOW>\<RESET> <BLUE>\<RESET>
<RED>|<RESET> <GREEN>|<RESET> <YELLOW>|<RESET> * 4
<RED>|<RESET> <GREEN>|<RESET> * <BLUE>|<RESET> 3
<RED>|<RESET> <GREEN>|<RESET> <BLUE>|<RESET><BLUE>/<RESET>
<RED>|<RESET> * <BLUE>|<RESET> 2
<RED>|<RESET> <BLUE>|<RESET><BLUE>/<RESET>
* <BLUE>|<RESET> 1
<BLUE>|<RESET><BLUE>/<RESET>
* initial
EOF
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
git log --color=always --graph --date-order --pretty=tformat:%s octopus-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with normal octopus merge and child, no color' '
cat >expect.uncolored <<-\EOF &&
* after-merge
*---. octopus-merge
|\ \ \
| | | * 4
| | * | 3
| | |/
| * | 2
| |/
* | 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s after-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_failure 'log --graph with normal octopus and child merge with colors' '
cat >expect.colors <<-\EOF &&
* after-merge
*<BLUE>-<RESET><BLUE>-<RESET><MAGENTA>-<RESET><MAGENTA>.<RESET> octopus-merge
<GREEN>|<RESET><YELLOW>\<RESET> <BLUE>\<RESET> <MAGENTA>\<RESET>
<GREEN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> * 4
<GREEN>|<RESET> <YELLOW>|<RESET> * <MAGENTA>|<RESET> 3
<GREEN>|<RESET> <YELLOW>|<RESET> <MAGENTA>|<RESET><MAGENTA>/<RESET>
<GREEN>|<RESET> * <MAGENTA>|<RESET> 2
<GREEN>|<RESET> <MAGENTA>|<RESET><MAGENTA>/<RESET>
* <MAGENTA>|<RESET> 1
<MAGENTA>|<RESET><MAGENTA>/<RESET>
* initial
EOF
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
git log --color=always --graph --date-order --pretty=tformat:%s after-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with tricky octopus merge and its child, no color' '
cat >expect.uncolored <<-\EOF &&
* left
| * after-merge
| *---. octopus-merge
| |\ \ \
|/ / / /
| | | * 4
| | * | 3
| | |/
| * | 2
| |/
* | 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s left after-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_failure 'log --graph with tricky octopus merge and its child with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* left
<RED>|<RESET> * after-merge
<RED>|<RESET> *<MAGENTA>-<RESET><MAGENTA>-<RESET><CYAN>-<RESET><CYAN>.<RESET> octopus-merge
<RED>|<RESET> <RED>|<RESET><BLUE>\<RESET> <MAGENTA>\<RESET> <CYAN>\<RESET>
<RED>|<RESET><RED>/<RESET> <BLUE>/<RESET> <MAGENTA>/<RESET> <CYAN>/<RESET>
<RED>|<RESET> <BLUE>|<RESET> <MAGENTA>|<RESET> * 4
<RED>|<RESET> <BLUE>|<RESET> * <CYAN>|<RESET> 3
<RED>|<RESET> <BLUE>|<RESET> <CYAN>|<RESET><CYAN>/<RESET>
<RED>|<RESET> * <CYAN>|<RESET> 2
<RED>|<RESET> <CYAN>|<RESET><CYAN>/<RESET>
* <CYAN>|<RESET> 1
<CYAN>|<RESET><CYAN>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s left after-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with crossover in octopus merge, no color' '
cat >expect.uncolored <<-\EOF &&
* after-4
| *---. octopus-merge
| |\ \ \
| |_|_|/
|/| | |
* | | | 4
| | | * 3
| |_|/
|/| |
| | * 2
| |/
|/|
| * 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s after-4 octopus-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_failure 'log --graph with crossover in octopus merge with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* after-4
<RED>|<RESET> *<BLUE>-<RESET><BLUE>-<RESET><RED>-<RESET><RED>.<RESET> octopus-merge
<RED>|<RESET> <GREEN>|<RESET><YELLOW>\<RESET> <BLUE>\<RESET> <RED>\<RESET>
<RED>|<RESET> <GREEN>|<RESET><RED>_<RESET><YELLOW>|<RESET><RED>_<RESET><BLUE>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><GREEN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET>
* <GREEN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> 4
<MAGENTA>|<RESET> <GREEN>|<RESET> <YELLOW>|<RESET> * 3
<MAGENTA>|<RESET> <GREEN>|<RESET><MAGENTA>_<RESET><YELLOW>|<RESET><MAGENTA>/<RESET>
<MAGENTA>|<RESET><MAGENTA>/<RESET><GREEN>|<RESET> <YELLOW>|<RESET>
<MAGENTA>|<RESET> <GREEN>|<RESET> * 2
<MAGENTA>|<RESET> <GREEN>|<RESET><MAGENTA>/<RESET>
<MAGENTA>|<RESET><MAGENTA>/<RESET><GREEN>|<RESET>
<MAGENTA>|<RESET> * 1
<MAGENTA>|<RESET><MAGENTA>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s after-4 octopus-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with crossover in octopus merge and its child, no color' '
cat >expect.uncolored <<-\EOF &&
* after-4
| * after-merge
| *---. octopus-merge
| |\ \ \
| |_|_|/
|/| | |
* | | | 4
| | | * 3
| |_|/
|/| |
| | * 2
| |/
|/|
| * 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s after-4 after-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_failure 'log --graph with crossover in octopus merge and its child with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* after-4
<RED>|<RESET> * after-merge
<RED>|<RESET> *<MAGENTA>-<RESET><MAGENTA>-<RESET><RED>-<RESET><RED>.<RESET> octopus-merge
<RED>|<RESET> <YELLOW>|<RESET><BLUE>\<RESET> <MAGENTA>\<RESET> <RED>\<RESET>
<RED>|<RESET> <YELLOW>|<RESET><RED>_<RESET><BLUE>|<RESET><RED>_<RESET><MAGENTA>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><YELLOW>|<RESET> <BLUE>|<RESET> <MAGENTA>|<RESET>
* <YELLOW>|<RESET> <BLUE>|<RESET> <MAGENTA>|<RESET> 4
<CYAN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> * 3
<CYAN>|<RESET> <YELLOW>|<RESET><CYAN>_<RESET><BLUE>|<RESET><CYAN>/<RESET>
<CYAN>|<RESET><CYAN>/<RESET><YELLOW>|<RESET> <BLUE>|<RESET>
<CYAN>|<RESET> <YELLOW>|<RESET> * 2
<CYAN>|<RESET> <YELLOW>|<RESET><CYAN>/<RESET>
<CYAN>|<RESET><CYAN>/<RESET><YELLOW>|<RESET>
<CYAN>|<RESET> * 1
<CYAN>|<RESET><CYAN>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s after-4 after-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with unrelated commit and octopus tip, no color' '
cat >expect.uncolored <<-\EOF &&
* after-initial
| *---. octopus-merge
| |\ \ \
| | | | * 4
| |_|_|/
|/| | |
| | | * 3
| |_|/
|/| |
| | * 2
| |/
|/|
| * 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s after-initial octopus-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_success 'log --graph with unrelated commit and octopus tip with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* after-initial
<RED>|<RESET> *<BLUE>-<RESET><BLUE>-<RESET><MAGENTA>-<RESET><MAGENTA>.<RESET> octopus-merge
<RED>|<RESET> <GREEN>|<RESET><YELLOW>\<RESET> <BLUE>\<RESET> <MAGENTA>\<RESET>
<RED>|<RESET> <GREEN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> * 4
<RED>|<RESET> <GREEN>|<RESET><RED>_<RESET><YELLOW>|<RESET><RED>_<RESET><BLUE>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><GREEN>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET>
<RED>|<RESET> <GREEN>|<RESET> <YELLOW>|<RESET> * 3
<RED>|<RESET> <GREEN>|<RESET><RED>_<RESET><YELLOW>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><GREEN>|<RESET> <YELLOW>|<RESET>
<RED>|<RESET> <GREEN>|<RESET> * 2
<RED>|<RESET> <GREEN>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><GREEN>|<RESET>
<RED>|<RESET> * 1
<RED>|<RESET><RED>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s after-initial octopus-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_expect_success 'log --graph with unrelated commit and octopus child, no color' '
cat >expect.uncolored <<-\EOF &&
* after-initial
| * after-merge
| *---. octopus-merge
| |\ \ \
| | | | * 4
| |_|_|/
|/| | |
| | | * 3
| |_|/
|/| |
| | * 2
| |/
|/|
| * 1
|/
* initial
EOF
git log --color=never --graph --date-order --pretty=tformat:%s after-initial after-merge >actual.raw &&
sed "s/ *\$//" actual.raw >actual &&
test_cmp expect.uncolored actual
'
test_expect_failure 'log --graph with unrelated commit and octopus child with colors' '
test_config log.graphColors red,green,yellow,blue,magenta,cyan &&
cat >expect.colors <<-\EOF &&
* after-initial
<RED>|<RESET> * after-merge
<RED>|<RESET> *<MAGENTA>-<RESET><MAGENTA>-<RESET><CYAN>-<RESET><CYAN>.<RESET> octopus-merge
<RED>|<RESET> <YELLOW>|<RESET><BLUE>\<RESET> <MAGENTA>\<RESET> <CYAN>\<RESET>
<RED>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> <MAGENTA>|<RESET> * 4
<RED>|<RESET> <YELLOW>|<RESET><RED>_<RESET><BLUE>|<RESET><RED>_<RESET><MAGENTA>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><YELLOW>|<RESET> <BLUE>|<RESET> <MAGENTA>|<RESET>
<RED>|<RESET> <YELLOW>|<RESET> <BLUE>|<RESET> * 3
<RED>|<RESET> <YELLOW>|<RESET><RED>_<RESET><BLUE>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><YELLOW>|<RESET> <BLUE>|<RESET>
<RED>|<RESET> <YELLOW>|<RESET> * 2
<RED>|<RESET> <YELLOW>|<RESET><RED>/<RESET>
<RED>|<RESET><RED>/<RESET><YELLOW>|<RESET>
<RED>|<RESET> * 1
<RED>|<RESET><RED>/<RESET>
* initial
EOF
git log --color=always --graph --date-order --pretty=tformat:%s after-initial after-merge >actual.colors.raw &&
test_decode_color <actual.colors.raw | sed "s/ *\$//" >actual.colors &&
test_cmp expect.colors actual.colors
'
test_done
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