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diff --git a/t/t5315-pack-objects-compression.sh b/t/t5315-pack-objects-compression.sh
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+#!/bin/sh
+
+test_description='pack-object compression configuration'
+
+. ./test-lib.sh
+
+# This should be moved to test-lib.sh together with the
+# copy in t0021 after both topics have graduated to 'master'.
+file_size () {
+ perl -e 'print -s $ARGV[0]' "$1"
+}
+
+test_expect_success setup '
+ printf "%2000000s" X |
+ git hash-object -w --stdin >object-name &&
+ # make sure it resulted in a loose object
+ ob=$(sed -e "s/\(..\).*/\1/" object-name) &&
+ ject=$(sed -e "s/..\(.*\)/\1/" object-name) &&
+ test -f .git/objects/$ob/$ject
+'
+
+while read expect config
+do
+ test_expect_success "pack-objects with $config" '
+ test_when_finished "rm -f pack-*.*" &&
+ git $config pack-objects pack <object-name &&
+ sz=$(file_size pack-*.pack) &&
+ case "$expect" in
+ small) test "$sz" -le 100000 ;;
+ large) test "$sz" -ge 100000 ;;
+ esac
+ '
+done <<\EOF
+large -c core.compression=0
+small -c core.compression=9
+large -c core.compression=0 -c pack.compression=0
+large -c core.compression=9 -c pack.compression=0
+small -c core.compression=0 -c pack.compression=9
+small -c core.compression=9 -c pack.compression=9
+large -c pack.compression=0
+small -c pack.compression=9
+EOF
+
+test_done