Add a base implementation of SHA-256 support

diff --git a/t/t0028-working-tree-encoding.sh b/t/t0028-working-tree-encoding.sh
index 12b8eb963a525e4083f96b7d9edc28858d90a1e7..7e87b5a200a3f6483ea2e243fa0c497205ce4e61 100755 (executable)
--- a/t/t0028-working-tree-encoding.sh
+++ b/t/t0028-working-tree-encoding.sh
@@ -203,7 +203,11 @@ test_expect_success 'error if encoding garbage is already in Git' '
        test_i18ngrep "error: BOM is required" err.out
 '
 
-test_expect_success 'check roundtrip encoding' '
+test_lazy_prereq ICONV_SHIFT_JIS '
+       iconv -f UTF-8 -t SHIFT-JIS </dev/null
+'
+
+test_expect_success ICONV_SHIFT_JIS 'check roundtrip encoding' '
        test_when_finished "rm -f roundtrip.shift roundtrip.utf16" &&
        test_when_finished "git reset --hard HEAD" &&