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-rwxr-xr-xt/t4031-diff-rewrite-binary.sh80
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diff --git a/t/t4031-diff-rewrite-binary.sh b/t/t4031-diff-rewrite-binary.sh
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index 0000000000..eacc6694f7
--- /dev/null
+++ b/t/t4031-diff-rewrite-binary.sh
@@ -0,0 +1,80 @@
+#!/bin/sh
+
+test_description='rewrite diff on binary file'
+
+. ./test-lib.sh
+
+# We must be large enough to meet the MINIMUM_BREAK_SIZE
+# requirement.
+make_file() {
+ # common first line to help identify rewrite versus regular diff
+ printf "=\n" >file
+ for i in 1 2 3 4 5 6 7 8 9 10
+ do
+ for j in 1 2 3 4 5 6 7 8 9
+ do
+ for k in 1 2 3 4 5
+ do
+ printf "$1\n"
+ done
+ done
+ done >>file
+}
+
+test_expect_success 'create binary file with changes' '
+ make_file "\\0" &&
+ git add file &&
+ make_file "\\01"
+'
+
+test_expect_success 'vanilla diff is binary' '
+ git diff >diff &&
+ grep "Binary files a/file and b/file differ" diff
+'
+
+test_expect_success 'rewrite diff is binary' '
+ git diff -B >diff &&
+ grep "dissimilarity index" diff &&
+ grep "Binary files a/file and b/file differ" diff
+'
+
+test_expect_success 'rewrite diff can show binary patch' '
+ git diff -B --binary >diff &&
+ grep "dissimilarity index" diff &&
+ grep "GIT binary patch" diff
+'
+
+test_expect_success 'rewrite diff --numstat shows binary changes' '
+ git diff -B --numstat --summary >diff &&
+ grep -e "- - " diff &&
+ grep " rewrite file" diff
+'
+
+test_expect_success 'diff --stat counts binary rewrite as 0 lines' '
+ git diff -B --stat --summary >diff &&
+ grep "Bin" diff &&
+ test_i18ngrep "0 insertions.*0 deletions" diff &&
+ grep " rewrite file" diff
+'
+
+{
+ echo "#!$SHELL_PATH"
+ cat <<'EOF'
+"$PERL_PATH" -e '$/ = undef; $_ = <>; s/./ord($&)/ge; print $_' < "$1"
+EOF
+} >dump
+chmod +x dump
+
+test_expect_success 'setup textconv' '
+ echo file diff=foo >.gitattributes &&
+ git config diff.foo.textconv "\"$(pwd)\""/dump
+'
+
+test_expect_success 'rewrite diff respects textconv' '
+ git diff -B >diff &&
+ grep "dissimilarity index" diff &&
+ grep "^-61" diff &&
+ grep "^-0" diff
+'
+
+test_done