Add tests that for-each-ref correctly reports broken loose reference
files and references that point at missing objects. In fact, two of
these tests fail, because (1) NULL_SHA1 is not recognized as an
invalid reference value, and (2) for-each-ref doesn't respect
REF_ISBROKEN. Fixes to come.

Signed-off-by: Michael Haggerty <mhag...@alum.mit.edu>
---

Notes (discussion):
    Note that a reference that points at NULL_SHA1 is reported as "broken"
    rather than "missing". This is because NULL_SHA1 is manifestly bogus,
    whereas we have no systematic basis for rejecting any other
    40-character hexadecimal string without doing an object lookup.

 t/t6301-for-each-ref-errors.sh | 45 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100755 t/t6301-for-each-ref-errors.sh

diff --git a/t/t6301-for-each-ref-errors.sh b/t/t6301-for-each-ref-errors.sh
new file mode 100755
index 0000000..dc68947
--- /dev/null
+++ b/t/t6301-for-each-ref-errors.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+test_description='for-each-ref errors for broken refs'
+
+. ./test-lib.sh
+
+ZEROS=0000000000000000000000000000000000000000
+MISSING=abababababababababababababababababababab
+
+test_expect_success setup '
+       git commit --allow-empty -m "Initial" &&
+       git tag testtag &&
+       git for-each-ref >full-list
+'
+
+test_expect_failure 'Broken refs are reported correctly' '
+       r=refs/heads/bogus &&
+       : >.git/$r &&
+       test_when_finished "rm -f .git/$r" &&
+       echo "warning: ignoring broken ref $r" >broken-err &&
+       git for-each-ref >out 2>err &&
+       test_cmp full-list out &&
+       test_cmp broken-err err
+'
+
+test_expect_failure 'NULL_SHA1 refs are reported correctly' '
+       r=refs/heads/zeros &&
+       echo $ZEROS >.git/$r &&
+       test_when_finished "rm -f .git/$r" &&
+       echo "warning: ignoring broken ref $r" >zeros-err &&
+       git for-each-ref >out 2>err &&
+       test_cmp full-list out &&
+       test_cmp zeros-err err
+'
+
+test_expect_success 'Missing objects are reported correctly' '
+       r=refs/heads/missing &&
+       echo $MISSING >.git/$r &&
+       test_when_finished "rm -f .git/$r" &&
+       echo "fatal: missing object $MISSING for $r" >missing-err &&
+       test_must_fail git for-each-ref 2>err &&
+       test_cmp missing-err err
+'
+
+test_done
-- 
2.1.4

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