[PATCH v3 2/9] t6019: test file dropped in -s ours merge

[Kevin Bracey <kevin@bracey.fi>]

In preparation for upcoming TREESAME work, check the result for G.t,
which is dropped in "-s ours" merge L. The default rev-list is empty, as
expected - it follows the first parent path where it never existed.

Unfortunately, --ancestry-path is also empty. Merges H J and L are all
TREESAME to 1 parent, so are treated as TREESAME and not shown. This is
clearly undesirable in the case of merge L, which dropped our G.t by
taking the non-ancestry-path version. Document this as a known failure,
and expect "H J L", the 3 merges along the path that had to chose G.t
versions.

Signed-off-by: Kevin Bracey <kevin@bracey.fi>
---
 t/t6019-rev-list-ancestry-path.sh | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/t/t6019-rev-list-ancestry-path.sh b/t/t6019-rev-list-ancestry-path.sh
index 39b4cb0..86ef908 100755
--- a/t/t6019-rev-list-ancestry-path.sh
+++ b/t/t6019-rev-list-ancestry-path.sh
@@ -13,6 +13,9 @@ test_description='--ancestry-path'
 #
 #  D..M -- M.t                 == M
 #  --ancestry-path D..M -- M.t == M
+#
+#  G..M -- G.t                 == [nothing - was dropped in "-s ours" merge L]
+#  --ancestry-path G..M -- G.t == H J L
 
 . ./test-lib.sh
 
@@ -63,13 +66,29 @@ test_expect_success 'rev-list D..M -- M.t' '
 	test_cmp expect actual
 '
 
-test_expect_success 'rev-list --ancestry-patch D..M -- M.t' '
+test_expect_success 'rev-list --ancestry-path D..M -- M.t' '
 	echo M >expect &&
 	git rev-list --ancestry-path --format=%s D..M -- M.t |
 	sed -e "/^commit /d" >actual &&
 	test_cmp expect actual
 '
 
+# G.t is dropped in an "-s ours" merge
+test_expect_success 'rev-list G..M -- G.t' '
+	>expect &&
+	git rev-list --format=%s G..M -- G.t |
+	sed -e "/^commit /d" >actual &&
+	test_cmp expect actual
+'
+
+test_expect_failure 'rev-list --ancestry-path G..M -- G.t' '
+	for c in H J L; do echo $c; done >expect &&
+	git rev-list --ancestry-path --format=%s G..M -- G.t |
+	sed -e "/^commit /d" |
+	sort >actual &&
+	test_cmp expect actual
+'
+
 #   b---bc
 #  / \ /
 # a   X
-- 
1.8.3.rc0.28.g682c2d9