[PATCH v2 5/9] t3701: add failing test for pathological context lines

From: Phillip Wood <phillip.wood@talktalk.net>
Date: Feb 19, 2018, 11:29 UTC
Message-ID: <20180219112910.24471-6-phillip.wood@talktalk.net>
In-Reply-To: <20180219112910.24471-1-phillip.wood@talktalk.net>

From: Phillip Wood <phillip.wood@dunelm.org.uk>

When a hunk is skipped by add -i the offsets of subsequent hunks are not adjusted to account for any missing insertions due to the skipped hunk. Most of the time this does not matter as apply uses the context lines to apply the subsequent hunks in the correct place, however in pathological cases the context lines will match at the now incorrect offset and the hunk will be applied in the wrong place. The offsets of hunks following an edited hunk that has had the number of insertions or deletions changed also need to be updated in the same way. Add failing tests to demonstrate this.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---

Notes:
    changes since v1:
     - changed edit test to use the existing fake editor and to strip
       the hunk header and some context lines as well as deleting an
       insertion
     - style fixes

 t/t3701-add-interactive.sh | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/t/t3701-add-interactive.sh b/t/t3701-add-interactive.sh
index 70748393f28c93f4bc5d43b07bd96bd208aba3e9..06c4747f506a1b05ccad0f9387e1fbd69cfd7784 100755
--- a/t/t3701-add-interactive.sh
+++ b/t/t3701-add-interactive.sh
@@ -511,4 +511,35 @@ test_expect_success 'status ignores dirty submodules (except HEAD)' '
 	! grep dirty-otherwise output
 '
 
+test_expect_success 'set up pathological context' '
+	git reset --hard &&
+	test_write_lines a a a a a a a a a a a >a &&
+	git add a &&
+	git commit -m a &&
+	test_write_lines c b a a a a a a a b a a a a >a &&
+	test_write_lines     a a a a a a a b a a a a >expected-1 &&
+	test_write_lines   b a a a a a a a b a a a a >expected-2 &&
+	# check editing can cope with missing header and deleted context lines
+	# as well as changes to other lines
+	test_write_lines +b " a" >patch
+'
+
+test_expect_failure 'add -p works with pathological context lines' '
+	git reset &&
+	printf "%s\n" n y |
+	git add -p &&
+	git cat-file blob :a >actual &&
+	test_cmp expected-1 actual
+'
+
+test_expect_failure 'add -p patch editing works with pathological context lines' '
+	git reset &&
+	test_set_editor "$FAKE_EDITOR" &&
+	# n q q below is in case edit fails
+	printf "%s\n" e y    n q q |
+	git add -p &&
+	git cat-file blob :a >actual &&
+	test_cmp expected-2 actual
+'
+
 test_done

-- 
2.16.1