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-rwxr-xr-xt/t4057-diff-combined-paths.sh110
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diff --git a/t/t4057-diff-combined-paths.sh b/t/t4057-diff-combined-paths.sh
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+++ b/t/t4057-diff-combined-paths.sh
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+#!/bin/sh
+
+test_description='combined diff show only paths that are different to all parents'
+
+GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
+export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
+
+TEST_PASSES_SANITIZE_LEAK=true
+. ./test-lib.sh
+
+# verify that diffc.expect matches output of
+# $(git diff -c --name-only HEAD HEAD^ HEAD^2)
+diffc_verify () {
+ git diff -c --name-only HEAD HEAD^ HEAD^2 >diffc.actual &&
+ test_cmp diffc.expect diffc.actual
+}
+
+test_expect_success 'trivial merge - combine-diff empty' '
+ for i in $(test_seq 1 9)
+ do
+ echo $i >$i.txt &&
+ git add $i.txt || return 1
+ done &&
+ git commit -m "init" &&
+ git checkout -b side &&
+ for i in $(test_seq 2 9)
+ do
+ echo $i/2 >>$i.txt || return 1
+ done &&
+ git commit -a -m "side 2-9" &&
+ git checkout main &&
+ echo 1/2 >1.txt &&
+ git commit -a -m "main 1" &&
+ git merge side &&
+ >diffc.expect &&
+ diffc_verify
+'
+
+
+test_expect_success 'only one truly conflicting path' '
+ git checkout side &&
+ for i in $(test_seq 2 9)
+ do
+ echo $i/3 >>$i.txt || return 1
+ done &&
+ echo "4side" >>4.txt &&
+ git commit -a -m "side 2-9 +4" &&
+ git checkout main &&
+ for i in $(test_seq 1 9)
+ do
+ echo $i/3 >>$i.txt || return 1
+ done &&
+ echo "4main" >>4.txt &&
+ git commit -a -m "main 1-9 +4" &&
+ test_must_fail git merge side &&
+ cat <<-\EOF >4.txt &&
+ 4
+ 4/2
+ 4/3
+ 4main
+ 4side
+ EOF
+ git add 4.txt &&
+ git commit -m "merge side (2)" &&
+ echo 4.txt >diffc.expect &&
+ diffc_verify
+'
+
+test_expect_success 'merge introduces new file' '
+ git checkout side &&
+ for i in $(test_seq 5 9)
+ do
+ echo $i/4 >>$i.txt || return 1
+ done &&
+ git commit -a -m "side 5-9" &&
+ git checkout main &&
+ for i in $(test_seq 1 3)
+ do
+ echo $i/4 >>$i.txt || return 1
+ done &&
+ git commit -a -m "main 1-3 +4hello" &&
+ git merge side &&
+ echo "Hello World" >4hello.txt &&
+ git add 4hello.txt &&
+ git commit --amend &&
+ echo 4hello.txt >diffc.expect &&
+ diffc_verify
+'
+
+test_expect_success 'merge removed a file' '
+ git checkout side &&
+ for i in $(test_seq 5 9)
+ do
+ echo $i/5 >>$i.txt || return 1
+ done &&
+ git commit -a -m "side 5-9" &&
+ git checkout main &&
+ for i in $(test_seq 1 3)
+ do
+ echo $i/4 >>$i.txt || return 1
+ done &&
+ git commit -a -m "main 1-3" &&
+ git merge side &&
+ git rm 4.txt &&
+ git commit --amend &&
+ echo 4.txt >diffc.expect &&
+ diffc_verify
+'
+
+test_done