test_cmp expect.err actual.err
'
+munge_author_date () {
+ git cat-file commit "$1" >commit.orig &&
+ sed "s/^\(author .*>\) [0-9]*/\1 $2/" <commit.orig >commit.munge &&
+ git hash-object -w -t commit commit.munge
+}
+
+test_expect_success 'unparsable dates produce sentinel value' '
+ commit=$(munge_author_date HEAD totally_bogus) &&
+ echo "Date: Thu Jan 1 00:00:00 1970 +0000" >expect &&
+ git log -1 $commit >actual.full &&
+ grep Date <actual.full >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'unparsable dates produce sentinel value (%ad)' '
+ commit=$(munge_author_date HEAD totally_bogus) &&
+ echo >expect &&
+ git log -1 --format=%ad $commit >actual
+ test_cmp expect actual
+'
+
+# date is 2^64 + 1
+test_expect_success 'date parser recognizes integer overflow' '
+ commit=$(munge_author_date HEAD 18446744073709551617) &&
+ echo "Thu Jan 1 00:00:00 1970 +0000" >expect &&
+ git log -1 --format=%ad $commit >actual &&
+ test_cmp expect actual
+'
+
+# date is 2^64 - 2
+test_expect_success 'date parser recognizes time_t overflow' '
+ commit=$(munge_author_date HEAD 18446744073709551614) &&
+ echo "Thu Jan 1 00:00:00 1970 +0000" >expect &&
+ git log -1 --format=%ad $commit >actual &&
+ test_cmp expect actual
+'
+
+# date is within 2^63-1, but enough to choke glibc's gmtime
+test_expect_success 'absurdly far-in-future date' '
+ commit=$(munge_author_date HEAD 999999999999999999) &&
+ git log -1 --format=%ad $commit
+'
+
test_done