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-rwxr-xr-xt/t7606-merge-custom.sh93
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diff --git a/t/t7606-merge-custom.sh b/t/t7606-merge-custom.sh
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+#!/bin/sh
+
+test_description="git merge
+
+Testing a custom strategy.
+
+* (HEAD, master) 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