t1300: add a few more hairy examples of sections becoming empty

During the review of the first iteration of the patch series to remove
sections that become empty upon --unset or --unset-all, Jeff King
identified a couple of problematic cases with the backtracking approach
that was still used then to "look backwards for the section header":
https://public-inbox.org/git/20180329213229.GG2939@sigill.intra.peff.net/

This patch adds a couple of concocted examples designed to fool a
backtracking parser.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1300-config.sh b/t/t1300-config.sh
index 3ab83fff8f54d662778e4f1115d2ec86d0484c95..a59c07fcb74c83d77377436f7d0864fe37ff13d7 100755 (executable)
--- a/t/t1300-config.sh
+++ b/t/t1300-config.sh
@@ -1426,7 +1426,50 @@ test_expect_failure '--unset last key removes section (except if commented)' '
        EOF
 
        git config --unset section.key &&
-       test_cmp expect .git/config
+       test_cmp expect .git/config &&
+
+       q_to_tab >.git/config <<-\EOF &&
+       [one]
+       Qkey = "multiline \
+       QQ# with comment"
+       [two]
+       key = true
+       EOF
+       git config --unset two.key &&
+       ! grep two .git/config &&
+
+       q_to_tab >.git/config <<-\EOF &&
+       [one]
+       Qkey = "multiline \
+       QQ# with comment"
+       [one]
+       key = true
+       EOF
+       git config --unset-all one.key &&
+       test_line_count = 0 .git/config &&
+
+       q_to_tab >.git/config <<-\EOF &&
+       [one]
+       Qkey = true
+       Q# a comment not at the start
+       [two]
+       Qkey = true
+       EOF
+       git config --unset two.key &&
+       grep two .git/config &&
+
+       q_to_tab >.git/config <<-\EOF &&
+       [one]
+       Qkey = not [two "subsection"]
+       [two "subsection"]
+       [two "subsection"]
+       Qkey = true
+       [TWO "subsection"]
+       [one]
+       EOF
+       git config --unset two.subsection.key &&
+       test "not [two subsection]" = "$(git config one.key)" &&
+       test_line_count = 3 .git/config
 '
 
 test_expect_failure 'adding a key into an empty section reuses header' '