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git/t/t4060-diff-submodule-option-diff-format.sh
Jeff King 17f2f88c9c t: move "git add submodule" into test blocks 
Some submodule tests do some setup outside of a test_expect
block. This is bad because we won't actually check the
outcome of those commands. But it's doubly so because "git
add submodule" now produces a warning to stderr, which is
not suppressed by the test scripts in non-verbose mode.

This patch does the minimal to fix the annoying warnings.
All three of these scripts could use more cleanup of related
setup.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-06-15 09:10:47 -07:00

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#!/bin/sh
#
# Copyright (c) 2009 Jens Lehmann, based on t7401 by Ping Yin
# Copyright (c) 2011 Alexey Shumkin (+ non-UTF-8 commit encoding tests)
# Copyright (c) 2016 Jacob Keller (copy + convert to --submodule=diff)
#
test_description='Support for diff format verbose submodule difference in git diff
This test tries to verify the sanity of --submodule=diff option of git diff.
'
. ./test-lib.sh
# Tested non-UTF-8 encoding
test_encoding="ISO8859-1"
# String "added" in German (translated with Google Translate), encoded in UTF-8,
# used in sample commit log messages in add_file() function below.
added=$(printf "hinzugef\303\274gt")
add_file () {
(
cd "$1" &&
shift &&
for name
do
echo "$name" >"$name" &&
git add "$name" &&
test_tick &&
# "git commit -m" would break MinGW, as Windows refuse to pass
# $test_encoding encoded parameter to git.
echo "Add $name ($added $name)" | iconv -f utf-8 -t $test_encoding |
git -c "i18n.commitEncoding=$test_encoding" commit -F -
done >/dev/null &&
git rev-parse --short --verify HEAD
)
}
commit_file () {
test_tick &&
git commit "$@" -m "Commit $*" >/dev/null
}
test_expect_success 'setup repository' '
test_create_repo sm1 &&
add_file . foo &&
head1=$(add_file sm1 foo1 foo2) &&
fullhead1=$(git -C sm1 rev-parse --verify HEAD)
'
test_expect_success 'added submodule' '
git add sm1 &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 0000000...$head1 (new submodule)
diff --git a/sm1/foo1 b/sm1/foo1
new file mode 100644
index 0000000..1715acd
--- /dev/null
+++ b/sm1/foo1
@@ -0,0 +1 @@
+foo1
diff --git a/sm1/foo2 b/sm1/foo2
new file mode 100644
index 0000000..54b060e
--- /dev/null
+++ b/sm1/foo2
@@ -0,0 +1 @@
+foo2
EOF
test_cmp expected actual
'
test_expect_success 'added submodule, set diff.submodule' '
test_config diff.submodule log &&
git add sm1 &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 0000000...$head1 (new submodule)
diff --git a/sm1/foo1 b/sm1/foo1
new file mode 100644
index 0000000..1715acd
--- /dev/null
+++ b/sm1/foo1
@@ -0,0 +1 @@
+foo1
diff --git a/sm1/foo2 b/sm1/foo2
new file mode 100644
index 0000000..54b060e
--- /dev/null
+++ b/sm1/foo2
@@ -0,0 +1 @@
+foo2
EOF
test_cmp expected actual
'
test_expect_success '--submodule=short overrides diff.submodule' '
test_config diff.submodule log &&
git add sm1 &&
git diff --submodule=short --cached >actual &&
cat >expected <<-EOF &&
diff --git a/sm1 b/sm1
new file mode 160000
index 0000000..$head1
--- /dev/null
+++ b/sm1
@@ -0,0 +1 @@
+Subproject commit $fullhead1
EOF
test_cmp expected actual
'
test_expect_success 'diff.submodule does not affect plumbing' '
test_config diff.submodule log &&
git diff-index -p HEAD >actual &&
cat >expected <<-EOF &&
diff --git a/sm1 b/sm1
new file mode 160000
index 0000000..$head1
--- /dev/null
+++ b/sm1
@@ -0,0 +1 @@
+Subproject commit $fullhead1
EOF
test_cmp expected actual
'
commit_file sm1 &&
head2=$(add_file sm1 foo3)
test_expect_success 'modified submodule(forward)' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head1..$head2:
diff --git a/sm1/foo3 b/sm1/foo3
new file mode 100644
index 0000000..c1ec6c6
--- /dev/null
+++ b/sm1/foo3
@@ -0,0 +1 @@
+foo3
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule(forward)' '
git diff --submodule=diff >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head1..$head2:
diff --git a/sm1/foo3 b/sm1/foo3
new file mode 100644
index 0000000..c1ec6c6
--- /dev/null
+++ b/sm1/foo3
@@ -0,0 +1 @@
+foo3
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule(forward) --submodule' '
git diff --submodule >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head1..$head2:
> Add foo3 ($added foo3)
EOF
test_cmp expected actual
'
fullhead2=$(cd sm1; git rev-parse --verify HEAD)
test_expect_success 'modified submodule(forward) --submodule=short' '
git diff --submodule=short >actual &&
cat >expected <<-EOF &&
diff --git a/sm1 b/sm1
index $head1..$head2 160000
--- a/sm1
+++ b/sm1
@@ -1 +1 @@
-Subproject commit $fullhead1
+Subproject commit $fullhead2
EOF
test_cmp expected actual
'
commit_file sm1 &&
head3=$(
cd sm1 &&
git reset --hard HEAD~2 >/dev/null &&
git rev-parse --short --verify HEAD
)
test_expect_success 'modified submodule(backward)' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head2..$head3 (rewind):
diff --git a/sm1/foo2 b/sm1/foo2
deleted file mode 100644
index 54b060e..0000000
--- a/sm1/foo2
+++ /dev/null
@@ -1 +0,0 @@
-foo2
diff --git a/sm1/foo3 b/sm1/foo3
deleted file mode 100644
index c1ec6c6..0000000
--- a/sm1/foo3
+++ /dev/null
@@ -1 +0,0 @@
-foo3
EOF
test_cmp expected actual
'
head4=$(add_file sm1 foo4 foo5)
test_expect_success 'modified submodule(backward and forward)' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head2...$head4:
diff --git a/sm1/foo2 b/sm1/foo2
deleted file mode 100644
index 54b060e..0000000
--- a/sm1/foo2
+++ /dev/null
@@ -1 +0,0 @@
-foo2
diff --git a/sm1/foo3 b/sm1/foo3
deleted file mode 100644
index c1ec6c6..0000000
--- a/sm1/foo3
+++ /dev/null
@@ -1 +0,0 @@
-foo3
diff --git a/sm1/foo4 b/sm1/foo4
new file mode 100644
index 0000000..a0016db
--- /dev/null
+++ b/sm1/foo4
@@ -0,0 +1 @@
+foo4
diff --git a/sm1/foo5 b/sm1/foo5
new file mode 100644
index 0000000..d6f2413
--- /dev/null
+++ b/sm1/foo5
@@ -0,0 +1 @@
+foo5
EOF
test_cmp expected actual
'
commit_file sm1 &&
mv sm1 sm1-bak &&
echo sm1 >sm1 &&
head5=$(git hash-object sm1 | cut -c1-7) &&
git add sm1 &&
rm -f sm1 &&
mv sm1-bak sm1
test_expect_success 'typechanged submodule(submodule->blob), --cached' '
git diff --submodule=diff --cached >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head4...0000000 (submodule deleted)
diff --git a/sm1/foo1 b/sm1/foo1
deleted file mode 100644
index 1715acd..0000000
--- a/sm1/foo1
+++ /dev/null
@@ -1 +0,0 @@
-foo1
diff --git a/sm1/foo4 b/sm1/foo4
deleted file mode 100644
index a0016db..0000000
--- a/sm1/foo4
+++ /dev/null
@@ -1 +0,0 @@
-foo4
diff --git a/sm1/foo5 b/sm1/foo5
deleted file mode 100644
index d6f2413..0000000
--- a/sm1/foo5
+++ /dev/null
@@ -1 +0,0 @@
-foo5
diff --git a/sm1 b/sm1
new file mode 100644
index 0000000..9da5fb8
--- /dev/null
+++ b/sm1
@@ -0,0 +1 @@
+sm1
EOF
test_cmp expected actual
'
test_expect_success 'typechanged submodule(submodule->blob)' '
git diff --submodule=diff >actual &&
cat >expected <<-EOF &&
diff --git a/sm1 b/sm1
deleted file mode 100644
index 9da5fb8..0000000
--- a/sm1
+++ /dev/null
@@ -1 +0,0 @@
-sm1
Submodule sm1 0000000...$head4 (new submodule)
diff --git a/sm1/foo1 b/sm1/foo1
new file mode 100644
index 0000000..1715acd
--- /dev/null
+++ b/sm1/foo1
@@ -0,0 +1 @@
+foo1
diff --git a/sm1/foo4 b/sm1/foo4
new file mode 100644
index 0000000..a0016db
--- /dev/null
+++ b/sm1/foo4
@@ -0,0 +1 @@
+foo4
diff --git a/sm1/foo5 b/sm1/foo5
new file mode 100644
index 0000000..d6f2413
--- /dev/null
+++ b/sm1/foo5
@@ -0,0 +1 @@
+foo5
EOF
test_cmp expected actual
'
rm -rf sm1 &&
git checkout-index sm1
test_expect_success 'typechanged submodule(submodule->blob)' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head4...0000000 (submodule deleted)
diff --git a/sm1 b/sm1
new file mode 100644
index 0000000..9da5fb8
--- /dev/null
+++ b/sm1
@@ -0,0 +1 @@
+sm1
EOF
test_cmp expected actual
'
rm -f sm1 &&
test_create_repo sm1 &&
head6=$(add_file sm1 foo6 foo7)
fullhead6=$(cd sm1; git rev-parse --verify HEAD)
test_expect_success 'nonexistent commit' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 $head4...$head6 (commits not present)
EOF
test_cmp expected actual
'
commit_file
test_expect_success 'typechanged submodule(blob->submodule)' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
diff --git a/sm1 b/sm1
deleted file mode 100644
index 9da5fb8..0000000
--- a/sm1
+++ /dev/null
@@ -1 +0,0 @@
-sm1
Submodule sm1 0000000...$head6 (new submodule)
diff --git a/sm1/foo6 b/sm1/foo6
new file mode 100644
index 0000000..462398b
--- /dev/null
+++ b/sm1/foo6
@@ -0,0 +1 @@
+foo6
diff --git a/sm1/foo7 b/sm1/foo7
new file mode 100644
index 0000000..6e9262c
--- /dev/null
+++ b/sm1/foo7
@@ -0,0 +1 @@
+foo7
EOF
test_cmp expected actual
'
commit_file sm1 &&
test_expect_success 'submodule is up to date' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
EOF
test_cmp expected actual
'
test_expect_success 'submodule contains untracked content' '
echo new > sm1/new-file &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains untracked content
EOF
test_cmp expected actual
'
test_expect_success 'submodule contains untracked content (untracked ignored)' '
git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'submodule contains untracked content (dirty ignored)' '
git diff-index -p --ignore-submodules=dirty --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'submodule contains untracked content (all ignored)' '
git diff-index -p --ignore-submodules=all --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'submodule contains untracked and modified content' '
echo new > sm1/foo6 &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains untracked content
Submodule sm1 contains modified content
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
# NOT OK
test_expect_success 'submodule contains untracked and modified content (untracked ignored)' '
echo new > sm1/foo6 &&
git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains modified content
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'submodule contains untracked and modified content (dirty ignored)' '
echo new > sm1/foo6 &&
git diff-index -p --ignore-submodules=dirty --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'submodule contains untracked and modified content (all ignored)' '
echo new > sm1/foo6 &&
git diff-index -p --ignore-submodules --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'submodule contains modified content' '
rm -f sm1/new-file &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains modified content
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
(cd sm1; git commit -mchange foo6 >/dev/null) &&
head8=$(cd sm1; git rev-parse --short --verify HEAD) &&
test_expect_success 'submodule is modified' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9..$head8:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked content' '
echo new > sm1/new-file &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains untracked content
Submodule sm1 17243c9..$head8:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked content (untracked ignored)' '
git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9..$head8:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked content (dirty ignored)' '
git diff-index -p --ignore-submodules=dirty --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9..cfce562:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked content (all ignored)' '
git diff-index -p --ignore-submodules=all --submodule=diff HEAD >actual &&
! test -s actual
'
test_expect_success 'modified submodule contains untracked and modified content' '
echo modification >> sm1/foo6 &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains untracked content
Submodule sm1 contains modified content
Submodule sm1 17243c9..cfce562:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..dfda541 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1,2 @@
-foo6
+new
+modification
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked and modified content (untracked ignored)' '
echo modification >> sm1/foo6 &&
git diff-index -p --ignore-submodules=untracked --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains modified content
Submodule sm1 17243c9..cfce562:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..e20e2d9 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1,3 @@
-foo6
+new
+modification
+modification
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked and modified content (dirty ignored)' '
echo modification >> sm1/foo6 &&
git diff-index -p --ignore-submodules=dirty --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9..cfce562:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..3e75765 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1 @@
-foo6
+new
EOF
test_cmp expected actual
'
test_expect_success 'modified submodule contains untracked and modified content (all ignored)' '
echo modification >> sm1/foo6 &&
git diff-index -p --ignore-submodules --submodule=diff HEAD >actual &&
! test -s actual
'
# NOT OK
test_expect_success 'modified submodule contains modified content' '
rm -f sm1/new-file &&
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 contains modified content
Submodule sm1 17243c9..cfce562:
diff --git a/sm1/foo6 b/sm1/foo6
index 462398b..ac466ca 100644
--- a/sm1/foo6
+++ b/sm1/foo6
@@ -1 +1,5 @@
-foo6
+new
+modification
+modification
+modification
+modification
EOF
test_cmp expected actual
'
rm -rf sm1
test_expect_success 'deleted submodule' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9...0000000 (submodule deleted)
EOF
test_cmp expected actual
'
test_expect_success 'create second submodule' '
test_create_repo sm2 &&
head7=$(add_file sm2 foo8 foo9) &&
git add sm2
'
test_expect_success 'multiple submodules' '
git diff-index -p --submodule=diff HEAD >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9...0000000 (submodule deleted)
Submodule sm2 0000000...a5a65c9 (new submodule)
diff --git a/sm2/foo8 b/sm2/foo8
new file mode 100644
index 0000000..db9916b
--- /dev/null
+++ b/sm2/foo8
@@ -0,0 +1 @@
+foo8
diff --git a/sm2/foo9 b/sm2/foo9
new file mode 100644
index 0000000..9c3b4f6
--- /dev/null
+++ b/sm2/foo9
@@ -0,0 +1 @@
+foo9
EOF
test_cmp expected actual
'
test_expect_success 'path filter' '
git diff-index -p --submodule=diff HEAD sm2 >actual &&
cat >expected <<-EOF &&
Submodule sm2 0000000...a5a65c9 (new submodule)
diff --git a/sm2/foo8 b/sm2/foo8
new file mode 100644
index 0000000..db9916b
--- /dev/null
+++ b/sm2/foo8
@@ -0,0 +1 @@
+foo8
diff --git a/sm2/foo9 b/sm2/foo9
new file mode 100644
index 0000000..9c3b4f6
--- /dev/null
+++ b/sm2/foo9
@@ -0,0 +1 @@
+foo9
EOF
test_cmp expected actual
'
commit_file sm2
test_expect_success 'given commit' '
git diff-index -p --submodule=diff HEAD^ >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9...0000000 (submodule deleted)
Submodule sm2 0000000...a5a65c9 (new submodule)
diff --git a/sm2/foo8 b/sm2/foo8
new file mode 100644
index 0000000..db9916b
--- /dev/null
+++ b/sm2/foo8
@@ -0,0 +1 @@
+foo8
diff --git a/sm2/foo9 b/sm2/foo9
new file mode 100644
index 0000000..9c3b4f6
--- /dev/null
+++ b/sm2/foo9
@@ -0,0 +1 @@
+foo9
EOF
test_cmp expected actual
'
test_expect_success 'setup .git file for sm2' '
(cd sm2 &&
REAL="$(pwd)/../.real" &&
mv .git "$REAL"
echo "gitdir: $REAL" >.git)
'
test_expect_success 'diff --submodule=diff with .git file' '
git diff --submodule=diff HEAD^ >actual &&
cat >expected <<-EOF &&
Submodule sm1 17243c9...0000000 (submodule deleted)
Submodule sm2 0000000...a5a65c9 (new submodule)
diff --git a/sm2/foo8 b/sm2/foo8
new file mode 100644
index 0000000..db9916b
--- /dev/null
+++ b/sm2/foo8
@@ -0,0 +1 @@
+foo8
diff --git a/sm2/foo9 b/sm2/foo9
new file mode 100644
index 0000000..9c3b4f6
--- /dev/null
+++ b/sm2/foo9
@@ -0,0 +1 @@
+foo9
EOF
test_cmp expected actual
'
test_expect_success 'setup nested submodule' '
git submodule add -f ./sm2 &&
git commit -a -m "add sm2" &&
git -C sm2 submodule add ../sm2 nested &&
git -C sm2 commit -a -m "nested sub"
'
test_expect_success 'move nested submodule HEAD' '
echo "nested content" >sm2/nested/file &&
git -C sm2/nested add file &&
git -C sm2/nested commit --allow-empty -m "new HEAD"
'
test_expect_success 'diff --submodule=diff with moved nested submodule HEAD' '
cat >expected <<-EOF &&
Submodule nested a5a65c9..b55928c:
diff --git a/nested/file b/nested/file
new file mode 100644
index 0000000..ca281f5
--- /dev/null
+++ b/nested/file
@@ -0,0 +1 @@
+nested content
EOF
git -C sm2 diff --submodule=diff >actual 2>err &&
test_must_be_empty err &&
test_cmp expected actual
'
test_expect_success 'diff --submodule=diff recurses into nested submodules' '
cat >expected <<-EOF &&
Submodule sm2 contains modified content
Submodule sm2 a5a65c9..280969a:
diff --git a/sm2/.gitmodules b/sm2/.gitmodules
new file mode 100644
index 0000000..3a816b8
--- /dev/null
+++ b/sm2/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "nested"]
+ path = nested
+ url = ../sm2
Submodule nested 0000000...b55928c (new submodule)
diff --git a/sm2/nested/file b/sm2/nested/file
new file mode 100644
index 0000000..ca281f5
--- /dev/null
+++ b/sm2/nested/file
@@ -0,0 +1 @@
+nested content
diff --git a/sm2/nested/foo8 b/sm2/nested/foo8
new file mode 100644
index 0000000..db9916b
--- /dev/null
+++ b/sm2/nested/foo8
@@ -0,0 +1 @@
+foo8
diff --git a/sm2/nested/foo9 b/sm2/nested/foo9
new file mode 100644
index 0000000..9c3b4f6
--- /dev/null
+++ b/sm2/nested/foo9
@@ -0,0 +1 @@
+foo9
EOF
git diff --submodule=diff >actual 2>err &&
test_must_be_empty err &&
test_cmp expected actual
'
test_done
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