git/t/t7615-diff-algo-with-mergy-...

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#!/bin/sh
test_description='git merge and other operations that rely on merge
Testing the influence of the diff algorithm on the merge output.'
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
test_expect_success 'setup' '
cp "$TEST_DIRECTORY"/t7615/base.c file.c &&
git add file.c &&
git commit -m c0 &&
git tag c0 &&
cp "$TEST_DIRECTORY"/t7615/ours.c file.c &&
git add file.c &&
git commit -m c1 &&
git tag c1 &&
git reset --hard c0 &&
cp "$TEST_DIRECTORY"/t7615/theirs.c file.c &&
git add file.c &&
git commit -m c2 &&
git tag c2
'
GIT_TEST_MERGE_ALGORITHM=recursive
test_expect_success 'merge c2 to c1 with recursive merge strategy fails with the current default myers diff algorithm' '
git reset --hard c1 &&
test_must_fail git merge -s recursive c2
'
test_expect_success 'merge c2 to c1 with recursive merge strategy succeeds with -Xdiff-algorithm=histogram' '
git reset --hard c1 &&
git merge --strategy recursive -Xdiff-algorithm=histogram c2
'
test_expect_success 'merge c2 to c1 with recursive merge strategy succeeds with diff.algorithm = histogram' '
git reset --hard c1 &&
git config diff.algorithm histogram &&
git merge --strategy recursive c2
'
test_expect_success 'cherry-pick c2 to c1 with recursive merge strategy fails with the current default myers diff algorithm' '
git reset --hard c1 &&
test_must_fail git cherry-pick -s recursive c2
'
test_expect_success 'cherry-pick c2 to c1 with recursive merge strategy succeeds with -Xdiff-algorithm=histogram' '
git reset --hard c1 &&
git cherry-pick --strategy recursive -Xdiff-algorithm=histogram c2
'
test_expect_success 'cherry-pick c2 to c1 with recursive merge strategy succeeds with diff.algorithm = histogram' '
git reset --hard c1 &&
git config diff.algorithm histogram &&
git cherry-pick --strategy recursive c2
'
test_done