v3, 3 partsUpdate t40* tests to use modern style.

6 messages between Sep 17, 2026 and Sep 18, 2026, from Mark C. Chu-Carroll, Junio C Hamano.

Plain Markdown or JSON for tools and agents. Diffs are folded; open one to read it.

Mark C. Chu-CarrollSep 17, 2026, 19:54 UTC on lore

Update t4001 to use modern style.

Old tests were written in a different style than modern ones; for better readability and test error messages, update t4001 to the modern style.

(Note: I somehow munged the b4 state of this series; I've done my best to fix it, but there may be threading artifacts in the email.)

Mark C. Chu-Carroll (3):
  Update t/t4001-diff-rename.sh to modern style.
  Update t/t4009-diff-rename-4 to use modern style.
  Update t/t4010-diff-pathspec.sh to modern style.

 t/t4001-diff-rename.sh   |  97 +++++++++++++----------------
 t/t4009-diff-rename-4.sh | 131 +++++++++++++++++++--------------------
 t/t4010-diff-pathspec.sh | 121 ++++++++++++++++++------------------
 3 files changed, 166 insertions(+), 183 deletions(-)

-- 
2.53.0

Mark C. Chu-CarrollSep 17, 2026, 19:54 UTC in reply to Mark C. Chu-Carroll on lore

[PATCH v3 1/3] Update t/t4001-diff-rename.sh to modern style.

Old tests were written in a different style than modern ones; for better readability and test error messages, update t4001 to the modern style.

Signed-off-by: Mark C. Chu-Carroll <markchucarroll@fastmail.com>
---
 t/t4001-diff-rename.sh   | 97 ++++++++++++++++++----------------------
 t/t4009-diff-rename-4.sh | 54 +++++++++++-----------
 2 files changed, 70 insertions(+), 81 deletions(-)

Show changes to 2 files +70 −81

t/t4001-diff-rename.sh, t/t4009-diff-rename-4.sh

diff --git a/t/t4001-diff-rename.sh b/t/t4001-diff-rename.sh
index ad474100af..c27bd9d781 100755
--- a/t/t4001-diff-rename.sh
+++ b/t/t4001-diff-rename.sh
@@ -8,7 +8,7 @@ test_description='Test rename detection in diff engine.'
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh
 
-test_expect_success 'setup' '
+initial_setup () {
 	cat >path0 <<-\EOF &&
 	Line 1
 	Line 2
@@ -26,7 +26,7 @@ test_expect_success 'setup' '
 	Line 14
 	Line 15
 	EOF
-	cat >expected <<-\EOF &&
+	cat >expect <<-\EOF &&
 	diff --git a/path0 b/path1
 	rename from path0
 	rename to path1
@@ -42,7 +42,7 @@ test_expect_success 'setup' '
 	 Line 13
 	 Line 14
 	EOF
-	cat >no-rename <<-\EOF
+	cat >expect-no-rename <<-\EOF
 	diff --git a/path0 b/path0
 	deleted file mode 100644
 	index fdbec44..0000000
@@ -86,47 +86,36 @@ test_expect_success 'setup' '
 	+Line 14
 	+Line 15
 	EOF
-'
-
-test_expect_success \
-    'update-index --add a file.' \
-    'git update-index --add path0'
-
-test_expect_success \
-    'write that tree.' \
-    'tree=$(git write-tree) && echo $tree'
-
-sed -e 's/line/Line/' <path0 >path1
-rm -f path0
-test_expect_success \
-    'renamed and edited the file.' \
-    'git update-index --add --remove path0 path1'
+    update-index --add a file.
+    git update-index --add path0
+}
 
-test_expect_success \
-    'git diff-index -p -M after rename and editing.' \
-    'git diff-index -p -M $tree >current'
-
-
-test_expect_success \
-    'validate the output.' \
-    'compare_diff_patch current expected'
+test_expect_success 'Diff shows path0 renamed to path1 with edit.' '
+	initial_setup &&
+	tree=$(git write-tree) &&
+	sed -e "s/line/Line/" <path0 >path1 &&
+	rm -f path0 &&
+	git update-index --add --remove path0 path1 &&
+	git diff-index -p -M $tree >actual &&
+	compare_diff_patch actual expect
+'
 
-test_expect_success 'test diff.renames=true' '
-	git -c diff.renames=true diff --cached $tree >current &&
-	compare_diff_patch current expected
+test_expect_success 'With diff.renames=true, patch includes rename of path0 to path1' '
+	git -c diff.renames=true diff --cached $tree >actual &&
+	compare_diff_patch actual expect
 '
 
-test_expect_success 'test diff.renames=false' '
-	git -c diff.renames=false diff --cached $tree >current &&
-	compare_diff_patch current no-rename
+test_expect_success 'With diff.renames=false, patch does not include rename' '
+	git -c diff.renames=false diff --cached $tree >actual &&
+	compare_diff_patch actual expect-no-rename
 '
 
-test_expect_success 'test diff.renames unset' '
-	git diff --cached $tree >current &&
-	compare_diff_patch current expected
+test_expect_success 'With no setting for diff.renames, patch includes rename' '
+	git diff --cached $tree >actual &&
+	compare_diff_patch actual expect
 '
 
-test_expect_success 'favour same basenames over different ones' '
+test_expect_success 'Diff rename favours same basenames over different ones' '
 	cp path1 another-path &&
 	git add another-path &&
 	git commit -m 1 &&
@@ -137,25 +126,25 @@ test_expect_success 'favour same basenames over different ones' '
 	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
-test_expect_success 'test diff.renames=true for git status' '
+test_expect_success 'With diff.renames=true, git status includes rename' '
 	git -c diff.renames=true status >out &&
 	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
-test_expect_success 'test diff.renames=false for git status' '
+test_expect_success 'With diff.renames=false, git status shows delete/add' '
 	git -c diff.renames=false status >out &&
 	test_grep ! "renamed: .*path1 -> subdir/path1" out &&
 	test_grep "new file: .*subdir/path1" out &&
 	test_grep "deleted: .*[^/]path1" out
 '
 
-test_expect_success 'favour same basenames even with minor differences' '
+test_expect_success 'rename logic favours same basenames even with minor differences' '
 	git show HEAD:path1 | sed "s/15/16/" > subdir/path1 &&
 	git status >out &&
 	test_grep "renamed: .*path1 -> subdir/path1" out
 '
 
-test_expect_success 'two files with same basename and same content' '
+test_expect_success 'Favors common path segments for files with the same basename and content' '
 	git reset --hard &&
 	mkdir -p dir/A dir/B &&
 	cp path1 dir/A/file &&
@@ -167,7 +156,7 @@ test_expect_success 'two files with same basename and same content' '
 	test_grep "renamed: .*dir/A/file -> other-dir/A/file" out
 '
 
-test_expect_success 'setup for many rename source candidates' '
+test_expect_success 'rename with many candidates' '
 	git reset --hard &&
 	for i in 0 1 2 3 4 5 6 7 8 9;
 	do
@@ -177,14 +166,14 @@ test_expect_success 'setup for many rename source candidates' '
 		done
 	done &&
 	git add "path??" &&
-	test_tick &&
+	test_tick  &&
 	git commit -m "hundred" &&
 	(cat path1 && echo new) >new-path &&
 	echo old >>path1 &&
 	git add new-path path1 &&
 	git diff -l 4 -C -C --cached --name-status >actual 2>actual.err &&
 	sed -e "s/^\([CM]\)[0-9]*	/\1	/" actual >actual.munged &&
-	cat >expect <<-EOF &&
+	cat >expect <<-\EOF &&
 	C	path1	new-path
 	M	path1
 	EOF
@@ -192,7 +181,7 @@ test_expect_success 'setup for many rename source candidates' '
 	test_grep warning actual.err
 '
 
-test_expect_success 'rename pretty print with nothing in common' '
+test_expect_success 'rename pretty prints paths with nothing in common' '
 	mkdir -p a/b/ &&
 	: >a/b/c &&
 	git add a/b/c &&
@@ -206,7 +195,7 @@ test_expect_success 'rename pretty print with nothing in common' '
 	test_grep " a/b/c => c/b/a " output
 '
 
-test_expect_success 'rename pretty print with common prefix' '
+test_expect_success 'rename pretty prints paths with common prefix' '
 	mkdir -p c/d &&
 	git mv c/b/a c/d/e &&
 	git commit -m "c/b/a -> c/d/e" &&
@@ -216,7 +205,7 @@ test_expect_success 'rename pretty print with common prefix' '
 	test_grep " c/{b/a => d/e} " output
 '
 
-test_expect_success 'rename pretty print with common suffix' '
+test_expect_success 'rename pretty prints paths with common suffix' '
 	mkdir d &&
 	git mv c/d/e d/e &&
 	git commit -m "c/d/e -> d/e" &&
@@ -226,7 +215,7 @@ test_expect_success 'rename pretty print with common suffix' '
 	test_grep " {c/d => d}/e " output
 '
 
-test_expect_success 'rename pretty print with common prefix and suffix' '
+test_expect_success 'rename pretty prints paths with common prefix and suffix' '
 	mkdir d/f &&
 	git mv d/e d/f/e &&
 	git commit -m "d/e -> d/f/e" &&
@@ -236,7 +225,7 @@ test_expect_success 'rename pretty print with common prefix and suffix' '
 	test_grep " d/{ => f}/e " output
 '
 
-test_expect_success 'rename pretty print common prefix and suffix overlap' '
+test_expect_success 'rename pretty prints paths with common prefix and suffix overlap' '
 	mkdir d/f/f &&
 	git mv d/f/e d/f/f/e &&
 	git commit -m "d/f/e d/f/f/e" &&
@@ -261,7 +250,7 @@ test_expect_success 'diff-tree -l0 defaults to a big rename limit, not zero' '
 	test_grep "myotherfile.*myfile" actual
 '
 
-test_expect_success 'basename similarity vs best similarity' '
+test_expect_success 'rename prefers basename similarity over best similarity' '
 	mkdir subdir &&
 	test_write_lines line1 line2 line3 line4 line5 \
 			 line6 line7 line8 line9 line10 >subdir/file.txt &&
@@ -278,14 +267,14 @@ test_expect_success 'basename similarity vs best similarity' '
 	git diff-tree -r -M --name-status HEAD^ HEAD >actual &&
 	# subdir/file.txt is 88% similar to file.md, 78% similar to file.txt,
 	# but since same basenames are checked first...
-	cat >expected <<-\EOF &&
+	cat >expect <<-\EOF &&
 	A	file.md
 	R078	subdir/file.txt	file.txt
 	EOF
-	test_cmp expected actual
+	test_cmp expect actual
 '
 
-test_expect_success 'last line matters too' '
+test_expect_success 'file similarity handles missing trailing newline.' '
 	{
 		test_write_lines a 0 1 2 3 4 5 6 7 8 9 &&
 		printf "git ignores final up to 63 characters if not newline terminated"
@@ -303,10 +292,10 @@ test_expect_success 'last line matters too' '
 	git commit -a -m "rename no-final-lf -> still-absent-final-lf" &&
 	git diff-tree -r -M --name-status HEAD^ HEAD >actual &&
 	sed -e "s/^R[0-9]*	/R	/" actual >actual.munged &&
-	cat >expected <<-\EOF &&
+	cat >expect <<-\EOF &&
 	R	no-final-lf	still-absent-final-lf
 	EOF
-	test_cmp expected actual.munged
+	test_cmp expect actual.munged
 '
 
 test_done
diff --git a/t/t4009-diff-rename-4.sh b/t/t4009-diff-rename-4.sh
index 59e71e3acd..198de5d039 100755
--- a/t/t4009-diff-rename-4.sh
+++ b/t/t4009-diff-rename-4.sh
@@ -10,23 +10,23 @@ test_description='Same rename detection as t4003 but testing diff-raw -z.
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
-test_expect_success \
-    'prepare reference tree' \
-    'COPYING_test_data >COPYING &&
-     echo frotz >rezrov &&
+test_expect_success  'prepare reference tree' '
+    COPYING_test_data >COPYING &&
+    echo frotz >rezrov &&
     git update-index --add COPYING rezrov &&
     orig=$(git hash-object COPYING) &&
     tree=$(git write-tree) &&
-    echo $tree'
+    echo $tree
+'
 
-test_expect_success \
-    'prepare work tree' \
-    'sed -e 's/HOWEVER/However/' <COPYING >COPYING.1 &&
-    sed -e 's/GPL/G.P.L/g' <COPYING >COPYING.2 &&
+test_expect_success 'prepare work tree' '
+    sed -e "s/HOWEVER/However/" <COPYING >COPYING.1 &&
+    sed -e "s/GPL/G.P.L/g" <COPYING >COPYING.2 &&
     rm -f COPYING &&
     c1=$(git hash-object COPYING.1) &&
     c2=$(git hash-object COPYING.2) &&
-    git update-index --add --remove COPYING COPYING.?'
+    git update-index --add --remove COPYING COPYING.?
+'
 
 # tree has COPYING and rezrov.  work tree has COPYING.1 and COPYING.2,
 # both are slightly edited, and unchanged rezrov.  We say COPYING.1
@@ -44,16 +44,16 @@ COPYING
 COPYING.2
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#1)' \
-    'compare_diff_raw_z current expected'
+test_expect_success 'validate output from rename/copy detection (#1)' '
+    compare_diff_raw_z current expected
+'
 
 ################################################################
 
-test_expect_success \
-    'prepare work tree again' \
-    'mv COPYING.2 COPYING &&
-     git update-index --add --remove COPYING COPYING.1 COPYING.2'
+test_expect_success 'prepare work tree again' '
+    mv COPYING.2 COPYING &&
+    git update-index --add --remove COPYING COPYING.1 COPYING.2
+'
 
 # tree has COPYING and rezrov.  work tree has COPYING and COPYING.1,
 # both are slightly edited, and unchanged rezrov.  We say COPYING.1
@@ -69,9 +69,9 @@ COPYING
 COPYING.1
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#2)' \
-    'compare_diff_raw_z current expected'
+test_expect_success 'validate output from rename/copy detection (#2)' '
+    compare_diff_raw_z current expected
+'
 
 ################################################################
 
@@ -80,10 +80,10 @@ test_expect_success \
 # anything about rezrov or COPYING, since the revised again diff-raw
 # nows how to say Copy.
 
-test_expect_success \
-    'prepare work tree once again' \
-    'COPYING_test_data >COPYING &&
-     git update-index --add --remove COPYING COPYING.1'
+test_expect_success 'prepare work tree once again' '
+    COPYING_test_data >COPYING &&
+    git update-index --add --remove COPYING COPYING.1
+'
 
 git diff-index -z -C --find-copies-harder $tree >current
 cat >expected <<EOF
@@ -92,8 +92,8 @@ COPYING
 COPYING.1
 EOF
 
-test_expect_success \
-    'validate output from rename/copy detection (#3)' \
-    'compare_diff_raw_z current expected'
+test_expect_success 'validate output from rename/copy detection (#3)' '
+    compare_diff_raw_z current expected
+'
 
 test_done

-- 
2.53.0

Mark C. Chu-CarrollSep 17, 2026, 19:54 UTC in reply to Mark C. Chu-Carroll on lore

[PATCH v3 2/3] Update t/t4009-diff-rename-4 to use modern style.

Old tests were written in a different style than modern ones; for better readability and test error messages, update t4009 to the modern style.

Signed-off-by: Mark C. Chu-Carroll <markchucarroll@fastmail.com>
---
 t/t4009-diff-rename-4.sh | 113 +++++++++++++++++++--------------------
 1 file changed, 54 insertions(+), 59 deletions(-)

Show changes to t/t4009-diff-rename-4.sh +54 −59

diff --git a/t/t4009-diff-rename-4.sh b/t/t4009-diff-rename-4.sh
index 198de5d039..7a48a7011c 100755
--- a/t/t4009-diff-rename-4.sh
+++ b/t/t4009-diff-rename-4.sh
@@ -10,67 +10,64 @@ test_description='Same rename detection as t4003 but testing diff-raw -z.
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
-test_expect_success  'prepare reference tree' '
+
+
+test_expect_success 'validate output from rename/copy detection (#1)' '
+    # prepare reference tree
     COPYING_test_data >COPYING &&
     echo frotz >rezrov &&
     git update-index --add COPYING rezrov &&
     orig=$(git hash-object COPYING) &&
     tree=$(git write-tree) &&
-    echo $tree
-'
-
-test_expect_success 'prepare work tree' '
+    echo $tree &&
+    # prepare work tree
     sed -e "s/HOWEVER/However/" <COPYING >COPYING.1 &&
     sed -e "s/GPL/G.P.L/g" <COPYING >COPYING.2 &&
     rm -f COPYING &&
     c1=$(git hash-object COPYING.1) &&
     c2=$(git hash-object COPYING.2) &&
-    git update-index --add --remove COPYING COPYING.?
-'
-
-# tree has COPYING and rezrov.  work tree has COPYING.1 and COPYING.2,
-# both are slightly edited, and unchanged rezrov.  We say COPYING.1
-# and COPYING.2 are based on COPYING, and do not say anything about
-# rezrov.
-
-git diff-index -z -C $tree >current
-
-cat >expected <<EOF
-:100644 100644 $orig $c1 C1234
-COPYING
-COPYING.1
-:100644 100644 $orig $c2 R1234
-COPYING
-COPYING.2
-EOF
-
-test_expect_success 'validate output from rename/copy detection (#1)' '
-    compare_diff_raw_z current expected
+	git update-index --add --remove COPYING COPYING.? &&
+
+	# tree has COPYING and rezrov.  work tree has COPYING.1 and COPYING.2,
+	# both are slightly edited, and unchanged rezrov.  We say COPYING.1
+	# and COPYING.2 are based on COPYING, and do not say anything about
+	# rezrov.
+
+    cat >expect <<-EOF &&
+	:100644 100644 $orig $c1 C1234
+	COPYING
+	COPYING.1
+	:100644 100644 $orig $c2 R1234
+	COPYING
+	COPYING.2
+	EOF
+
+    git diff-index -z -C $tree >actual &&
+    compare_diff_raw_z actual expect
 '
 
 ################################################################
 
-test_expect_success 'prepare work tree again' '
-    mv COPYING.2 COPYING &&
-    git update-index --add --remove COPYING COPYING.1 COPYING.2
-'
-
-# tree has COPYING and rezrov.  work tree has COPYING and COPYING.1,
-# both are slightly edited, and unchanged rezrov.  We say COPYING.1
-# is based on COPYING and COPYING is still there, and do not say anything
-# about rezrov.
-
-git diff-index -z -C $tree >current
-cat >expected <<EOF
-:100644 100644 $orig $c2 M
-COPYING
-:100644 100644 $orig $c1 C1234
-COPYING
-COPYING.1
-EOF
-
 test_expect_success 'validate output from rename/copy detection (#2)' '
-    compare_diff_raw_z current expected
+    # prepare work tree again
+    mv COPYING.2 COPYING &&
+    git update-index --add --remove COPYING COPYING.1 COPYING.2 &&
+
+	# tree has COPYING and rezrov.  work tree has COPYING and COPYING.1,
+	# both are slightly edited, and unchanged rezrov.  We say COPYING.1
+	# is based on COPYING and COPYING is still there, and do not say anything
+	# about rezrov.
+
+	git diff-index -z -C $tree >actual &&
+	cat >expect <<-EOF &&
+	:100644 100644 $orig $c2 M
+	COPYING
+	:100644 100644 $orig $c1 C1234
+	COPYING
+	COPYING.1
+	EOF
+
+    compare_diff_raw_z actual expect
 '
 
 ################################################################
@@ -80,20 +77,18 @@ test_expect_success 'validate output from rename/copy detection (#2)' '
 # anything about rezrov or COPYING, since the revised again diff-raw
 # nows how to say Copy.
 
-test_expect_success 'prepare work tree once again' '
-    COPYING_test_data >COPYING &&
-    git update-index --add --remove COPYING COPYING.1
-'
-
-git diff-index -z -C --find-copies-harder $tree >current
-cat >expected <<EOF
-:100644 100644 $orig $c1 C1234
-COPYING
-COPYING.1
-EOF
-
 test_expect_success 'validate output from rename/copy detection (#3)' '
-    compare_diff_raw_z current expected
+    # prepare work tree once again
+    COPYING_test_data >COPYING &&
+    git update-index --add --remove COPYING COPYING.1 &&
+    git diff-index -z -C --find-copies-harder $tree >actual &&
+    cat >expect <<-EOF &&
+	:100644 100644 $orig $c1 C1234
+	COPYING
+	COPYING.1
+	EOF
+
+    compare_diff_raw_z actual expect
 '
 
 test_done

-- 
2.53.0

Mark C. Chu-CarrollSep 17, 2026, 19:54 UTC in reply to Mark C. Chu-Carroll on lore

[PATCH v3 3/3] Update t/t4010-diff-pathspec.sh to modern style.

Old tests were written in a different style than modern ones; for better readability and test error messages, update t4010 to the modern style.

Signed-off-by: Mark C. Chu-Carroll <markchucarroll@fastmail.com>
---
 t/t4010-diff-pathspec.sh | 121 +++++++++++++++++++--------------------
 1 file changed, 60 insertions(+), 61 deletions(-)

Show changes to t/t4010-diff-pathspec.sh +60 −61

diff --git a/t/t4010-diff-pathspec.sh b/t/t4010-diff-pathspec.sh
index c84c3fa05b..76ddd3ff4e 100755
--- a/t/t4010-diff-pathspec.sh
+++ b/t/t4010-diff-pathspec.sh
@@ -13,67 +13,66 @@ Prepare:
 . ./test-lib.sh
 . "$TEST_DIRECTORY"/lib-diff.sh ;# test-lib chdir's into trash
 
-test_expect_success \
-    setup \
-    'echo frotz >file0 &&
-     mkdir path1 &&
-     echo rezrov >path1/file1 &&
-     before0=$(git hash-object file0) &&
-     before1=$(git hash-object path1/file1) &&
-     git update-index --add file0 path1/file1 &&
-     tree=$(git write-tree) &&
-     echo "$tree" &&
-     echo nitfol >file0 &&
-     echo yomin >path1/file1 &&
-     after0=$(git hash-object file0) &&
-     after1=$(git hash-object path1/file1) &&
-     git update-index file0 path1/file1'
-
-cat >expected <<\EOF
-EOF
-test_expect_success \
-    'limit to path should show nothing' \
-    'git diff-index --cached $tree -- path >current &&
-     compare_diff_raw current expected'
-
-cat >expected <<EOF
-:100644 100644 $before1 $after1 M	path1/file1
-EOF
-test_expect_success \
-    'limit to path1 should show path1/file1' \
-    'git diff-index --cached $tree -- path1 >current &&
-     compare_diff_raw current expected'
-
-cat >expected <<EOF
-:100644 100644 $before1 $after1 M	path1/file1
-EOF
-test_expect_success \
-    'limit to path1/ should show path1/file1' \
-    'git diff-index --cached $tree -- path1/ >current &&
-     compare_diff_raw current expected'
-
-cat >expected <<EOF
-:100644 100644 $before1 $after1 M	path1/file1
-EOF
-test_expect_success \
-    '"*file1" should show path1/file1' \
-    'git diff-index --cached $tree -- "*file1" >current &&
-     compare_diff_raw current expected'
-
-cat >expected <<EOF
-:100644 100644 $before0 $after0 M	file0
-EOF
-test_expect_success \
-    'limit to file0 should show file0' \
-    'git diff-index --cached $tree -- file0 >current &&
-     compare_diff_raw current expected'
-
-cat >expected <<\EOF
-EOF
-test_expect_success \
-    'limit to file0/ should emit nothing.' \
-    'git diff-index --cached $tree -- file0/ >current &&
-     compare_diff_raw current expected'
+
+test_expect_success 'limit to path should show nothing' '
+	echo frotz >file0 &&
+	mkdir path1 &&
+	echo rezrov >path1/file1 &&
+	before0=$(git hash-object file0) &&
+	before1=$(git hash-object path1/file1) &&
+	git update-index --add file0 path1/file1 &&
+	tree=$(git write-tree) &&
+	echo "$tree" &&
+	echo nitfol >file0 &&
+	echo yomin >path1/file1 &&
+	after0=$(git hash-object file0) &&
+	after1=$(git hash-object path1/file1) &&
+	git update-index file0 path1/file1 &&
+	: >expected &&
+	git diff-index --cached $tree -- path >current &&
+	compare_diff_raw current expected
+'
+
+test_expect_success 'limit to path1 should show path1/file1' '
+	cat >expected <<-EOF &&
+	:100644 100644 $before1 $after1 M	path1/file1
+	EOF
+
+	git diff-index --cached $tree -- path1 >current &&
+	compare_diff_raw current expected
+'
+
+test_expect_success 'limit to path1/ should show path1/file1' '
+	cat >expected <<-EOF &&
+	:100644 100644 $before1 $after1 M	path1/file1
+	EOF
+
+	git diff-index --cached $tree -- path1/ >current &&
+	compare_diff_raw current expected
+'
+test_expect_success '"*file1" should show path1/file1' '
+	cat >expected <<-EOF &&
+	:100644 100644 $before1 $after1 M	path1/file1
+	EOF
+
+	git diff-index --cached $tree -- "*file1" >current &&
+	compare_diff_raw current expected
+'
+
+test_expect_success 'limit to file0 should show file0' '
+	cat >expected <<-EOF &&
+	:100644 100644 $before0 $after0 M	file0
+	EOF
+
+	git diff-index --cached $tree -- file0 >current &&
+	compare_diff_raw current expected
+'
+
+test_expect_success 'limit to file0/ should emit nothing.' '
+    : >expected &&
+	git diff-index --cached $tree -- file0/ >current &&
+	compare_diff_raw current expected
+'
 
 test_expect_success 'diff-tree pathspec' '
 	tree2=$(git write-tree) &&

-- 
2.53.0

Junio C HamanoSep 18, 2026, 07:10 UTC in reply to Mark C. Chu-Carroll on lore

Re: [PATCH v3 1/3] Update t/t4001-diff-rename.sh to modern style.

"Mark C. Chu-Carroll" <markchucarroll@fastmail.com> writes:

> Subject: Re: [PATCH v3 1/3] Update t/t4001-diff-rename.sh to modern style.

Documentation/SubmittingPatches::[[summary-section]]

Perhaps

    Subject: [PATCH v3 1/3] t4001: modernize

> Old tests were written in a different style than modern
> ones; for better readability and test error messages,
> update t4001 to the modern style.

That is a laudable goal, but enumerate the rules you followed to achieve that goal. For example, a few of them may have been

 * Run everything inside test_expect_success block.

 * Write the title on the same line as test_expect_success and end
   that line with a singul quote that opens the body of the test; a
   line with a sole single quote then closes the body.

> Signed-off-by: Mark C. Chu-Carroll <markchucarroll@fastmail.com>
> ---

> -test_expect_success 'setup' '
> +initial_setup () {

Why a shell function that is called only once by a test titled "Diff shows path0 ..." below? It is customary to perform the setup in the very first test_expect_success whose title is 'setup'. I doubt it would contribute to better readability to change that.

Show 8 quoted lines

> -test_expect_success 'test diff.renames=true' '
> +test_expect_success 'With diff.renames=true, patch includes rename of path0 to path1' '
> -test_expect_success 'test diff.renames=false' '
> +test_expect_success 'With diff.renames=false, patch does not include rename' '
> ...
>  
> -test_expect_success 'favour same basenames even with minor differences' '
> +test_expect_success 'rename logic favours same basenames even with minor differences' '

Here you are failing to follow your own renaming rules to start test titles in uppercase letters. I personally wouldn't have chosen to upcase many of them; rather, the majority of tests in this file seem to be named in lowercase so I would have instead made sure I'd start them in lowercase as well. In any case, please be consistent.

Show 11 quoted lines

> -test_expect_success 'setup for many rename source candidates' '
> +test_expect_success 'rename with many candidates' '
>  	git reset --hard &&
>  	for i in 0 1 2 3 4 5 6 7 8 9;
>  	do
> @@ -177,14 +166,14 @@ test_expect_success 'setup for many rename source candidates' '
>  		done
>  	done &&
>  	git add "path??" &&
> -	test_tick &&
> +	test_tick  &&

Good eyes ;-).

> -test_expect_success 'rename pretty print with common prefix' '
> +test_expect_success 'rename pretty prints paths with common prefix' '

Meh.

Neither way, it is grammatical at all 'rename' may not be plural, so the verb 'print' may want 's' for third-person-singular, but it does not make sense to use 'rename' as the subject for "pretty-print" anyway. It is not that 'rename' is the one that prints something.

Mark C. Chu-CarrollSep 18, 2026, 14:54 UTC in reply to Junio C Hamano on lore

Re: [PATCH v3 1/3] Update t/t4001-diff-rename.sh to modern style.

On Fri Sep 18, 2026 at 3:10 AM EDT, Junio C Hamano wrote:

Show 9 quoted lines

> "Mark C. Chu-Carroll" <markchucarroll@fastmail.com> writes:
>
>> Subject: Re: [PATCH v3 1/3] Update t/t4001-diff-rename.sh to modern style.
>
> Documentation/SubmittingPatches::[[summary-section]]
>
> Perhaps
>
>     Subject: [PATCH v3 1/3] t4001: modernize

Good suggestion, thanks.

Show 25 quoted lines

>
>> Old tests were written in a different style than modern
>> ones; for better readability and test error messages,
>> update t4001 to the modern style.
>
> That is a laudable goal, but enumerate the rules you followed to
> achieve that goal.  For example, a few of them may have been
>
>  * Run everything inside test_expect_success block.
>
>  * Write the title on the same line as test_expect_success and end
>    that line with a singul quote that opens the body of the test; a
>    line with a sole single quote then closes the body.
>
>
>> Signed-off-by: Mark C. Chu-Carroll <markchucarroll@fastmail.com>
>> ---
>
>> -test_expect_success 'setup' '
>> +initial_setup () {
>
> Why a shell function that is called only once by a test titled "Diff
> shows path0 ..." below?  It is customary to perform the setup in the
> very first test_expect_success whose title is 'setup'.  I doubt it
> would contribute to better readability to change that.

I went back and forth on that in terms of readability. I'll switch it back.

Show 15 quoted lines

>
>> -test_expect_success 'test diff.renames=true' '
>> +test_expect_success 'With diff.renames=true, patch includes rename of path0 to path1' '
>> -test_expect_success 'test diff.renames=false' '
>> +test_expect_success 'With diff.renames=false, patch does not include rename' '
>> ...
>>  
>> -test_expect_success 'favour same basenames even with minor differences' '
>> +test_expect_success 'rename logic favours same basenames even with minor differences' '
>
> Here you are failing to follow your own renaming rules to start test
> titles in uppercase letters.  I personally wouldn't have chosen to
> upcase many of them; rather, the majority of tests in this file seem
> to be named in lowercase so I would have instead made sure I'd start
> them in lowercase as well.  In any case, please be consistent.

Good eye - I didn't even see that.

Show 10 quoted lines

>> -test_expect_success 'rename pretty print with common prefix' '
>> +test_expect_success 'rename pretty prints paths with common prefix' '
>
> Meh.
>
> Neither way, it is grammatical at all 'rename' may not be plural, so
> the verb 'print' may want 's' for third-person-singular, but it does
> not make sense to use 'rename' as the subject for "pretty-print"
> anyway.  It is not that 'rename' is the one that prints something.
>

I'll try to come up with something better.

Thanks for the review! I'll send an update later today.

         -Mark

-- 
Mark Craig Chu-Carroll (@MarkChuCarroll at gitlab)
*** Software Tools/Math Geek - Software Engineer at Gitlab
*** Work Email: mcarroll@gitlab.com / markchucarroll@fastmail.com
*** Personal Blog: http://goodmath.org/blog / Personal email: markcc@gmail.com