1 files changed, 93 insertions, 0 deletions
diff --git a/t/t7606-merge-custom.sh b/t/t7606-merge-custom.sh
new file mode 100755
index 0000000..81fb7c4
--- /dev/null
+++ b/t/t7606-merge-custom.sh
@@ -0,0 +1,93 @@
+#!/bin/sh
+
+test_description="git merge
+
+Testing a custom strategy.
+
+*   (HEAD, main) Merge commit 'c3'
+|\
+| * (tag: c3) c3
+* | (tag: c1) c1
+|/
+| * tag: c2) c2
+|/
+* (tag: c0) c0
+"
+
+. ./test-lib.sh
+
+test_expect_success 'set up custom strategy' '
+	cat >git-merge-theirs <<-EOF &&
+	#!$SHELL_PATH
+	eval git read-tree --reset -u \\\$\$#
+	EOF
+
+	chmod +x git-merge-theirs &&
+	PATH=.:$PATH &&
+	export PATH
+'
+
+test_expect_success 'setup' '
+	test_commit c0 c0.c &&
+	test_commit c1 c1.c &&
+	git reset --keep c0 &&
+	echo c1c1 >c1.c &&
+	git add c1.c &&
+	test_commit c2 c2.c &&
+	git reset --keep c0 &&
+	test_commit c3 c3.c
+'
+
+test_expect_success 'merge c2 with a custom strategy' '
+	git reset --hard c1 &&
+
+	git rev-parse c1 >head.old &&
+	git rev-parse c2 >second-parent.expected &&
+	git rev-parse c2^{tree} >tree.expected &&
+	git merge -s theirs c2 &&
+
+	git rev-parse HEAD >head.new &&
+	git rev-parse HEAD^1 >first-parent &&
+	git rev-parse HEAD^2 >second-parent &&
+	git rev-parse HEAD^{tree} >tree &&
+	git update-index --refresh &&
+	git diff --exit-code &&
+	git diff --exit-code c2 HEAD &&
+	git diff --exit-code c2 &&
+
+	! test_cmp head.old head.new &&
+	test_cmp head.old first-parent &&
+	test_cmp second-parent.expected second-parent &&
+	test_cmp tree.expected tree &&
+	test -f c0.c &&
+	grep c1c1 c1.c &&
+	test -f c2.c
+'
+
+test_expect_success 'trivial merge with custom strategy' '
+	git reset --hard c1 &&
+
+	git rev-parse c1 >head.old &&
+	git rev-parse c3 >second-parent.expected &&
+	git rev-parse c3^{tree} >tree.expected &&
+	git merge -s theirs c3 &&
+
+	git rev-parse HEAD >head.new &&
+	git rev-parse HEAD^1 >first-parent &&
+	git rev-parse HEAD^2 >second-parent &&
+	git rev-parse HEAD^{tree} >tree &&
+	git update-index --refresh &&
+	git diff --exit-code &&
+	git diff --exit-code c3 HEAD &&
+	git diff --exit-code c3 &&
+
+	! test_cmp head.old head.new &&
+	test_cmp head.old first-parent &&
+	test_cmp second-parent.expected second-parent &&
+	test_cmp tree.expected tree &&
+	test -f c0.c &&
+	! test -e c1.c &&
+	test -f c3.c
+'
+
+test_done