1 files changed, 296 insertions, 0 deletions
diff --git a/t/t4108-apply-threeway.sh b/t/t4108-apply-threeway.sh
new file mode 100755
index 0000000..c558282
--- /dev/null
+++ b/t/t4108-apply-threeway.sh
@@ -0,0 +1,296 @@
+#!/bin/sh
+
+test_description='git apply --3way'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+. ./test-lib.sh
+
+print_sanitized_conflicted_diff () {
+	git diff HEAD >diff.raw &&
+	sed -e '
+		/^index /d
+		s/^\(+[<>|][<>|][<>|][<>|]*\) .*/\1/
+	' diff.raw
+}
+
+test_expect_success setup '
+	test_tick &&
+	test_write_lines 1 2 3 4 5 6 7 >one &&
+	cat one >two &&
+	git add one two &&
+	git commit -m initial &&
+
+	git branch side &&
+
+	test_tick &&
+	test_write_lines 1 two 3 4 5 six 7 >one &&
+	test_write_lines 1 two 3 4 5 6 7 >two &&
+	git commit -a -m main &&
+
+	git checkout side &&
+	test_write_lines 1 2 3 4 five 6 7 >one &&
+	test_write_lines 1 2 3 4 five 6 7 >two &&
+	git commit -a -m side &&
+
+	git checkout main
+'
+
+test_expect_success 'apply without --3way' '
+	git diff side^ side >P.diff &&
+
+	# should fail to apply
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git apply --index P.diff &&
+	# should leave things intact
+	git diff-files --exit-code &&
+	git diff-index --exit-code --cached HEAD
+'
+
+test_apply_with_3way () {
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding conflicted merge
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git merge --no-commit side &&
+	git ls-files -s >expect.ls &&
+	print_sanitized_conflicted_diff >expect.diff &&
+
+	# should fail to apply
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git apply --index --3way P.diff &&
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The result should resemble the corresponding merge
+	test_cmp expect.ls actual.ls &&
+	test_cmp expect.diff actual.diff
+}
+
+test_expect_success 'apply with --3way' '
+	test_apply_with_3way
+'
+
+test_expect_success 'apply with --3way with merge.conflictStyle = diff3' '
+	test_config merge.conflictStyle diff3 &&
+	test_apply_with_3way
+'
+
+test_expect_success 'apply with --3way with rerere enabled' '
+	test_config rerere.enabled true &&
+
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding conflicted merge
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git merge --no-commit side &&
+
+	# Manually resolve and record the resolution
+	test_write_lines 1 two 3 4 five six 7 >one &&
+	git rerere &&
+	cat one >expect &&
+
+	# should fail to apply
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git apply --index --3way P.diff &&
+
+	# but rerere should have replayed the recorded resolution
+	test_cmp expect one
+'
+
+test_expect_success 'apply -3 with add/add conflict setup' '
+	git reset --hard &&
+
+	git checkout -b adder &&
+	test_write_lines 1 2 3 4 5 6 7 >three &&
+	test_write_lines 1 2 3 4 5 6 7 >four &&
+	git add three four &&
+	git commit -m "add three and four" &&
+
+	git checkout -b another adder^ &&
+	test_write_lines 1 2 3 4 5 6 7 >three &&
+	test_write_lines 1 2 3 four 5 6 7 >four &&
+	git add three four &&
+	git commit -m "add three and four" &&
+
+	# Merging another should be similar to applying this patch
+	git diff adder...another >P.diff &&
+
+	git checkout adder^0 &&
+	test_must_fail git merge --no-commit another &&
+	git ls-files -s >expect.ls &&
+	print_sanitized_conflicted_diff >expect.diff
+'
+
+test_expect_success 'apply -3 with add/add conflict' '
+	# should fail to apply ...
+	git reset --hard &&
+	git checkout adder^0 &&
+	test_must_fail git apply --index --3way P.diff &&
+	# ... and leave conflicts in the index and in the working tree
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The result should resemble the corresponding merge
+	test_cmp expect.ls actual.ls &&
+	test_cmp expect.diff actual.diff
+'
+
+test_expect_success 'apply -3 with add/add conflict (dirty working tree)' '
+	# should fail to apply ...
+	git reset --hard &&
+	git checkout adder^0 &&
+	echo >>four &&
+	cat four >four.save &&
+	cat three >three.save &&
+	git ls-files -s >expect.ls &&
+	test_must_fail git apply --index --3way P.diff &&
+	# ... and should not touch anything
+	git ls-files -s >actual.ls &&
+	test_cmp expect.ls actual.ls &&
+	test_cmp four.save four &&
+	test_cmp three.save three
+'
+
+test_expect_success 'apply -3 with ambiguous repeating file' '
+	git reset --hard &&
+	test_write_lines 1 2 1 2 1 2 1 2 1 2 1 >one_two_repeat &&
+	git add one_two_repeat &&
+	git commit -m "init one" &&
+	test_write_lines 1 2 1 2 1 2 1 2 one 2 1 >one_two_repeat &&
+	git commit -a -m "change one" &&
+
+	git diff HEAD~ >Repeat.diff &&
+	git reset --hard HEAD~ &&
+
+	test_write_lines 1 2 1 2 1 2 one 2 1 2 one >one_two_repeat &&
+	git commit -a -m "change surrounding one" &&
+
+	git apply --index --3way Repeat.diff &&
+	test_write_lines 1 2 1 2 1 2 one 2 one 2 one >expect &&
+
+	test_cmp expect one_two_repeat
+'
+
+test_expect_success 'apply with --3way --cached clean apply' '
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding cleanly applied merge
+	git reset --hard &&
+	git checkout main~ &&
+	git merge --no-commit side &&
+	git ls-files -s >expect.ls &&
+
+	# should succeed
+	git reset --hard &&
+	git checkout main~ &&
+	git apply --cached --3way P.diff &&
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The cache should resemble the corresponding merge
+	# (both files at stage #0)
+	test_cmp expect.ls actual.ls &&
+	# However the working directory should not change
+	>expect.diff &&
+	test_cmp expect.diff actual.diff
+'
+
+test_expect_success 'apply with --3way --cached and conflicts' '
+	# Merging side should be similar to applying this patch
+	git diff ...side >P.diff &&
+
+	# The corresponding conflicted merge
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git merge --no-commit side &&
+	git ls-files -s >expect.ls &&
+
+	# should fail to apply
+	git reset --hard &&
+	git checkout main^0 &&
+	test_must_fail git apply --cached --3way P.diff &&
+	git ls-files -s >actual.ls &&
+	print_sanitized_conflicted_diff >actual.diff &&
+
+	# The cache should resemble the corresponding merge
+	# (one file at stage #0, one file at stages #1 #2 #3)
+	test_cmp expect.ls actual.ls &&
+	# However the working directory should not change
+	>expect.diff &&
+	test_cmp expect.diff actual.diff
+'
+
+test_expect_success 'apply binary file patch' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --binary >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply bin.diff
+'
+
+test_expect_success 'apply binary file patch with 3way' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --binary >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply --3way --index bin.diff
+'
+
+test_expect_success 'apply full-index patch with 3way' '
+	git reset --hard main &&
+	cp "$TEST_DIRECTORY/test-binary-1.png" bin.png &&
+	git add bin.png &&
+	git commit -m "add binary file" &&
+
+	cp "$TEST_DIRECTORY/test-binary-2.png" bin.png &&
+
+	git diff --full-index >bin.diff &&
+	git reset --hard &&
+
+	# Apply must succeed.
+	git apply --3way --index bin.diff
+'
+
+test_expect_success 'apply delete then new patch with 3way' '
+	git reset --hard main &&
+	test_write_lines 2 > delnew &&
+	git add delnew &&
+	git diff --cached >> new.patch &&
+	git reset --hard &&
+	test_write_lines 1 > delnew &&
+	git add delnew &&
+	git commit -m "delnew" &&
+	rm delnew &&
+	git diff >> delete-then-new.patch &&
+	cat new.patch >> delete-then-new.patch &&
+
+	git checkout -- . &&
+	# Apply must succeed.
+	git apply --3way delete-then-new.patch
+'
+
+test_done