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-rwxr-xr-xt/t7603-merge-reduce-heads.sh164
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diff --git a/t/t7603-merge-reduce-heads.sh b/t/t7603-merge-reduce-heads.sh
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+#!/bin/sh
+
+test_description='git merge
+
+Testing octopus merge when reducing parents to independent branches.'
+
+. ./test-lib.sh
+
+# 0 - 1
+# \ 2
+# \ 3
+# \ 4 - 5
+#
+# So 1, 2, 3 and 5 should be kept, 4 should be avoided.
+
+test_expect_success 'setup' '
+ echo c0 > c0.c &&
+ git add c0.c &&
+ git commit -m c0 &&
+ git tag c0 &&
+ echo c1 > c1.c &&
+ git add c1.c &&
+ git commit -m c1 &&
+ git tag c1 &&
+ git reset --hard c0 &&
+ echo c2 > c2.c &&
+ git add c2.c &&
+ git commit -m c2 &&
+ git tag c2 &&
+ git reset --hard c0 &&
+ echo c3 > c3.c &&
+ git add c3.c &&
+ git commit -m c3 &&
+ git tag c3 &&
+ git reset --hard c0 &&
+ echo c4 > c4.c &&
+ git add c4.c &&
+ git commit -m c4 &&
+ git tag c4 &&
+ echo c5 > c5.c &&
+ git add c5.c &&
+ git commit -m c5 &&
+ git tag c5
+'
+
+test_expect_success 'merge c1 with c2, c3, c4, c5' '
+ git reset --hard c1 &&
+ git merge c2 c3 c4 c5 &&
+ test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
+ test "$(git rev-parse c1)" = "$(git rev-parse HEAD^1)" &&
+ test "$(git rev-parse c2)" = "$(git rev-parse HEAD^2)" &&
+ test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
+ test "$(git rev-parse c5)" = "$(git rev-parse HEAD^4)" &&
+ git diff --exit-code &&
+ test -f c0.c &&
+ test -f c1.c &&
+ test -f c2.c &&
+ test -f c3.c &&
+ test -f c4.c &&
+ test -f c5.c &&
+ git show --format=%s -s >actual &&
+ ! grep c1 actual &&
+ grep c2 actual &&
+ grep c3 actual &&
+ ! grep c4 actual &&
+ grep c5 actual
+'
+
+test_expect_success 'pull c2, c3, c4, c5 into c1' '
+ git reset --hard c1 &&
+ git pull --no-rebase . c2 c3 c4 c5 &&
+ test "$(git rev-parse c1)" != "$(git rev-parse HEAD)" &&
+ test "$(git rev-parse c1)" = "$(git rev-parse HEAD^1)" &&
+ test "$(git rev-parse c2)" = "$(git rev-parse HEAD^2)" &&
+ test "$(git rev-parse c3)" = "$(git rev-parse HEAD^3)" &&
+ test "$(git rev-parse c5)" = "$(git rev-parse HEAD^4)" &&
+ git diff --exit-code &&
+ test -f c0.c &&
+ test -f c1.c &&
+ test -f c2.c &&
+ test -f c3.c &&
+ test -f c4.c &&
+ test -f c5.c &&
+ git show --format=%s -s >actual &&
+ ! grep c1 actual &&
+ grep c2 actual &&
+ grep c3 actual &&
+ ! grep c4 actual &&
+ grep c5 actual
+'
+
+test_expect_success 'setup' '
+ for i in A B C D E
+ do
+ echo $i > $i.c &&
+ git add $i.c &&
+ git commit -m $i &&
+ git tag $i || return 1
+ done &&
+ git reset --hard A &&
+ for i in F G H I
+ do
+ echo $i > $i.c &&
+ git add $i.c &&
+ git commit -m $i &&
+ git tag $i || return 1
+ done
+'
+
+test_expect_success 'merge E and I' '
+ git reset --hard A &&
+ git merge E I
+'
+
+test_expect_success 'verify merge result' '
+ test $(git rev-parse HEAD^1) = $(git rev-parse E) &&
+ test $(git rev-parse HEAD^2) = $(git rev-parse I)
+'
+
+test_expect_success 'add conflicts' '
+ git reset --hard E &&
+ echo foo > file.c &&
+ git add file.c &&
+ git commit -m E2 &&
+ git tag E2 &&
+ git reset --hard I &&
+ echo bar >file.c &&
+ git add file.c &&
+ git commit -m I2 &&
+ git tag I2
+'
+
+test_expect_success 'merge E2 and I2, causing a conflict and resolve it' '
+ git reset --hard A &&
+ test_must_fail git merge E2 I2 &&
+ echo baz > file.c &&
+ git add file.c &&
+ git commit -m "resolve conflict"
+'
+
+test_expect_success 'verify merge result' '
+ test $(git rev-parse HEAD^1) = $(git rev-parse E2) &&
+ test $(git rev-parse HEAD^2) = $(git rev-parse I2)
+'
+
+test_expect_success 'fast-forward to redundant refs' '
+ git reset --hard c0 &&
+ git merge c4 c5
+'
+
+test_expect_success 'verify merge result' '
+ test $(git rev-parse HEAD) = $(git rev-parse c5)
+'
+
+test_expect_success 'merge up-to-date redundant refs' '
+ git reset --hard c5 &&
+ git merge c0 c4
+'
+
+test_expect_success 'verify merge result' '
+ test $(git rev-parse HEAD) = $(git rev-parse c5)
+'
+
+test_done