diff --git a/t/t6111-rev-list-treesame.sh b/t/t6111-rev-list-treesame.sh
new file mode 100755
index 000000000..b2bca771c
--- /dev/null
+++ b/t/t6111-rev-list-treesame.sh
@@ -0,0 +1,184 @@
+#!/bin/sh
+#
+#        ,---E--.   *H----------.             * marks !TREESAME parent paths
+#       /        \ /             \*
+# *A--*B---D--*F-*G---------K-*L-*M
+#   \     /*       \       /
+#    `-C-'          `-*I-*J
+#
+# A creates "file", B and F change it.
+# Odd merge G takes the old version from B.
+# I changes it, but J reverts it, so K is TREESAME to both parents.
+# H and L both change "file", and M merges those changes.
+
+test_description='TREESAME and limiting'
+
+. ./test-lib.sh
+
+note () {
+	git tag "$1"
+}
+
+unnote () {
+	git name-rev --tags --stdin | sed -e "s|$_x40 (tags/\([^)]*\)) |\1 |g"
+}
+
+test_expect_success setup '
+	test_commit "Initial file" file "Hi there" A &&
+	git branch other-branch &&
+
+	test_commit "file=Hello" file "Hello" B &&
+	git branch third-branch &&
+
+	git checkout other-branch &&
+	test_commit "Added other" other "Hello" C &&
+
+	git checkout master &&
+	test_merge D other-branch &&
+
+	git checkout third-branch &&
+	test_commit "Third file" third "Nothing" E &&
+
+	git checkout master &&
+	test_commit "file=Blah" file "Blah" F &&
+
+	test_tick && git merge --no-commit third-branch &&
+	git checkout third-branch file &&
+	git commit &&
+	note G &&
+	git branch fiddler-branch &&
+
+	git checkout -b part2-branch &&
+	test_commit "file=Part 2" file "Part 2" H &&
+
+	git checkout fiddler-branch &&
+	test_commit "Bad commit" file "Silly" I &&
+
+	test_tick && git revert I && note J &&
+
+	git checkout master &&
+	test_tick && git merge --no-ff fiddler-branch &&
+	note K
+
+	test_commit "file=Part 1" file "Part 1" L &&
+
+	test_tick && test_must_fail git merge part2-branch &&
+	test_commit M file "Parts 1+2"
+'
+
+FMT='tformat:%P 	%H | %s'
+
+# could we soup this up to optionally check parents? So "(BA)C" would check
+# that C is shown and has parents B A.
+check_outcome () {
+	outcome=$1
+	shift
+	for c in $1
+	do
+		echo "$c"
+	done >expect &&
+	shift &&
+	param="$*" &&
+	test_expect_$outcome "log $param" '
+		git log --format="$FMT" $param |
+		unnote >actual &&
+		sed -e "s/^.*	\([^ ]*\) .*/\1/" >check <actual &&
+		test_cmp expect check || {
+			cat actual
+			false
+		}
+	'
+}
+
+check_result () {
+	check_outcome success "$@"
+}
+
+# Odd merge G drops a change in F. Important that G is listed in all
+# except the most basic list. Achieving this means normal merge D will also be
+# shown in normal full-history, as we can't distinguish unless we do a
+# simplification pass. After simplification, D is dropped but G remains.
+check_result 'M L K J I H G F E D C B A'
+check_result 'M H L K J I G E F D C B A' --topo-order
+check_result 'M L H B A' -- file
+check_result 'M L H B A' --parents -- file
+check_outcome failure 'M L J I H G F D B A' --full-history -- file # drops G
+check_result 'M L K J I H G F D B A' --full-history --parents -- file
+check_outcome failure 'M H L J I G F B A' --simplify-merges -- file # drops G
+check_result 'M L K G F D B A' --first-parent
+check_result 'M L G F B A' --first-parent -- file
+
+# Check that odd merge G remains shown when F is the bottom.
+check_result 'M L K J I H G E' F..M
+check_result 'M H L K J I G E' F..M --topo-order
+check_result 'M L H' F..M -- file
+check_result 'M L H' F..M --parents -- file # L+H's parents rewritten to B, so more useful than it may seem
+check_outcome failure 'M L J I H G' F..M --full-history -- file # drops G
+check_result 'M L K J I H G' F..M --full-history --parents -- file
+check_outcome failure 'M H L J I G' F..M --simplify-merges -- file # drops G
+check_result 'M L K J I H G' F..M --ancestry-path
+check_outcome failure 'M L J I H G' F..M --ancestry-path -- file # drops G
+check_result 'M L K J I H G' F..M --ancestry-path --parents -- file
+check_result 'M H L J I G' F..M --ancestry-path --simplify-merges -- file
+check_result 'M L K G' F..M --first-parent
+check_result 'M L G' F..M --first-parent -- file
+
+# Note that G is pruned when E is the bottom, even if it's the same commit list
+# If we want history since E, then we're quite happy to ignore G that took E.
+check_result 'M L K J I H G' E..M --ancestry-path
+check_result 'M L J I H' E..M --ancestry-path -- file
+check_outcome failure 'M L K J I H' E..M --ancestry-path --parents -- file # includes G
+check_outcome failure 'M H L J I' E..M --ancestry-path --simplify-merges -- file # includes G
+
+# Should still be able to ignore I-J branch in simple log, despite limiting
+# to G.
+check_result 'M L K J I H' G..M
+check_result 'M H L K J I' G..M --topo-order
+check_outcome failure 'M L H' G..M -- file # includes J I
+check_outcome failure 'M L H' G..M --parents -- file # includes J I
+check_result 'M L J I H' G..M --full-history -- file
+check_result 'M L K J I H' G..M --full-history --parents -- file
+check_result 'M H L J I' G..M --simplify-merges -- file
+check_result 'M L K J I H' G..M --ancestry-path
+check_result 'M L J I H' G..M --ancestry-path -- file
+check_result 'M L K J I H' G..M --ancestry-path --parents -- file
+check_result 'M H L J I' G..M --ancestry-path --simplify-merges -- file
+
+# B..F should be able to simplify the merge D from irrelevant side branch C.
+# Default log should also be free to follow B-D, and ignore C.
+# But --full-history shouldn't drop D on its own - without simplification,
+# we can't decide if the merge from INTERESTING commit C was sensible.
+check_result 'F D C' B..F
+check_result 'F' B..F -- file
+check_outcome failure 'F' B..F --parents -- file # includes D
+check_outcome failure 'F D' B..F --full-history -- file # drops D prematurely
+check_result 'F D' B..F --full-history --parents -- file
+check_result 'F' B..F --simplify-merges -- file
+check_result 'F D' B..F --ancestry-path
+check_result 'F' B..F --ancestry-path -- file
+check_outcome failure 'F' B..F --ancestry-path --parents -- file # includes D
+check_outcome failure 'F' B..F --ancestry-path --simplify-merges -- file # includes D
+check_result 'F D' B..F --first-parent
+check_result 'F' B..F --first-parent -- file
+
+# E...F should be equivalent to E F ^B, and be able to drop D as above.
+check_result 'F' E F ^B -- file
+check_result 'F' E...F -- file
+
+# Any sort of full history of C..F should show D, as it's the connection to C,
+# and it differs from it.
+check_result 'F D B' C..F
+check_result 'F B' C..F -- file
+check_result 'F B' C..F --parents -- file
+check_outcome failure 'F D B' C..F --full-history -- file # drops D
+check_result 'F D B' C..F --full-history --parents -- file
+check_result 'F D B' C..F --simplify-merges -- file
+check_result 'F D' C..F --ancestry-path
+check_outcome failure 'F D' C..F --ancestry-path -- file # drops D
+check_result 'F D' C..F --ancestry-path --parents -- file
+check_result 'F D' C..F --ancestry-path --simplify-merges -- file
+check_result 'F D B' C..F --first-parent
+check_result 'F B' C..F --first-parent -- file
+
+
+test_done