tests: du: test --block-size and BLOCK_SIZE

* tests/du/block-size.sh: New file.
* tests/local.mk: Add the test case.

diff --git a/tests/du/block-size.sh b/tests/du/block-size.sh
new file mode 100755 (executable)
index 0000000..4d2b93b
--- /dev/null
+++ b/tests/du/block-size.sh
@@ -0,0 +1,153 @@
+#!/bin/sh
+# Test 'du --block-size' and the BLOCK_SIZE environment variable.
+
+# Copyright (C) 2026 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+. "${srcdir=.}/tests/init.sh"; path_prepend_ ./src
+print_ver_ du
+
+# Kilobytes.
+truncate -s 1000 1kb &&
+truncate -s 10000 10kb &&
+truncate -s 100000 100kb || framework_failure_
+
+# Kibibytes.
+truncate -s 1024 1kib &&
+truncate -s 10240 10kib &&
+truncate -s 102400 100kib || framework_failure_
+
+# Megabytes.
+truncate -s 1000000 1mb &&
+truncate -s 10000000 10mb &&
+truncate -s 100000000 100mb || framework_failure_
+
+# Mebibytes.
+truncate -s 1048576 1mib &&
+truncate -s 10485760 10mib &&
+truncate -s 104857600 100mib || framework_failure_
+
+# 'tr', but only operating on the first character.
+tr_first ()
+{
+  first=$(printf '%s' "$1" | cut -c1) || framework_failure_
+  rest=$(printf '%s' "$1" | cut -c2-) || framework_failure_
+  printf '%s%s' "$(printf '%s' "$first" | tr "$2" "$3")" "$rest" ||
+    framework_failure_
+}
+
+# Test a unit, both with and without the 1 prefix.
+test_unit ()
+{
+  lower=$(tr_first "$1" '[:upper:]' '[:lower:]')
+  upper=$(tr_first "$1" '[:lower:]' '[:upper:]')
+  # When there is a prefix of 1, the unit is not printed.  Setup a file
+  # to compare to.
+  sed 's/^\([0-9][0-9]*\)'"$upper"'/\1/g' <exp >exp1 || framework_failure_
+  for opt in BLOCK_SIZE -B --block-size=; do
+    for c in $lower $upper; do
+      for prefix in '' 1; do
+        case $opt in
+          -*) env=; arg=$opt$prefix$c ;;
+          *) arg=; env=$opt=$prefix$c ;;
+        esac
+        env $env du -A $arg 1* >out 2>err || fail=1
+        compare exp$prefix out || fail=1
+        compare /dev/null err || fail=1
+      done
+    done
+  done
+  # The '-k' option is equivalent to --block-size=1K, but doesn't fit
+  # well in the above loop.  Just test it here.
+  if test $lower = k; then
+    du -A -k 1* >out 2>err || fail=1
+    compare exp1 out || fail=1
+    compare /dev/null err || fail=1
+  fi
+}
+
+cat <<\EOF >exp || framework_failure_
+98KiB  100kb
+100KiB 100kib
+97657KiB       100mb
+102400KiB      100mib
+10KiB  10kb
+10KiB  10kib
+9766KiB        10mb
+10240KiB       10mib
+1KiB   1kb
+1KiB   1kib
+977KiB 1mb
+1024KiB        1mib
+EOF
+
+# Kilobytes.
+test_unit KiB
+
+cat <<\EOF >exp || framework_failure_
+98K    100kb
+100K   100kib
+97657K 100mb
+102400K        100mib
+10K    10kb
+10K    10kib
+9766K  10mb
+10240K 10mib
+1K     1kb
+1K     1kib
+977K   1mb
+1024K  1mib
+EOF
+
+# Kibibytes.
+test_unit k
+
+cat <<\EOF >exp || framework_failure_
+1MiB   100kb
+1MiB   100kib
+96MiB  100mb
+100MiB 100mib
+1MiB   10kb
+1MiB   10kib
+10MiB  10mb
+10MiB  10mib
+1MiB   1kb
+1MiB   1kib
+1MiB   1mb
+1MiB   1mib
+EOF
+
+# Megabytes.
+test_unit MiB
+
+cat <<\EOF >exp || framework_failure_
+1M     100kb
+1M     100kib
+96M    100mb
+100M   100mib
+1M     10kb
+1M     10kib
+10M    10mb
+10M    10mib
+1M     1kb
+1M     1kib
+1M     1mb
+1M     1mib
+EOF
+
+# Mebibytes.
+test_unit m
+
+Exit $fail

diff --git a/tests/local.mk b/tests/local.mk
index 9414dbf9da3d11929e683d5b8087ecf1c6ce9ba7..f0fdd00865eaa4e08f23cfecd0fdea4caeaa72b8 100644 (file)
--- a/tests/local.mk
+++ b/tests/local.mk
@@ -655,6 +655,7 @@ all_tests =                                 \
   tests/du/apparent.sh                         \
   tests/du/basic.sh                            \
   tests/du/bigtime.sh                          \
+  tests/du/block-size.sh                       \
   tests/du/deref.sh                            \
   tests/du/deref-args.sh                       \
   tests/du/exclude.sh                          \