grep -q "error: sha1 mismatch 63ffffffffffffffffffffffffffffffffffffff" out
'
+_bz='\0'
+_bz5="$_bz$_bz$_bz$_bz$_bz"
+_bz20="$_bz5$_bz5$_bz5$_bz5"
+
+test_expect_success 'fsck notices blob entry pointing to null sha1' '
+ (git init null-blob &&
+ cd null-blob &&
+ sha=$(printf "100644 file$_bz$_bz20" |
+ git hash-object -w --stdin -t tree) &&
+ git fsck 2>out &&
+ cat out &&
+ grep "warning.*null sha1" out
+ )
+'
+
+test_expect_success 'fsck notices submodule entry pointing to null sha1' '
+ (git init null-commit &&
+ cd null-commit &&
+ sha=$(printf "160000 submodule$_bz$_bz20" |
+ git hash-object -w --stdin -t tree) &&
+ git fsck 2>out &&
+ cat out &&
+ grep "warning.*null sha1" out
+ )
+'
+
+test_expect_success 'fsck notices "." and ".." in trees' '
+ (
+ git init dots &&
+ cd dots &&
+ blob=$(echo foo | git hash-object -w --stdin) &&
+ tab=$(printf "\\t") &&
+ git mktree <<-EOF &&
+ 100644 blob $blob$tab.
+ 100644 blob $blob$tab..
+ EOF
+ git fsck 2>out &&
+ cat out &&
+ grep "warning.*\\." out
+ )
+'
+
+test_expect_success 'fsck notices ".git" in trees' '
+ (
+ git init dotgit &&
+ cd dotgit &&
+ blob=$(echo foo | git hash-object -w --stdin) &&
+ tab=$(printf "\\t") &&
+ git mktree <<-EOF &&
+ 100644 blob $blob$tab.git
+ EOF
+ git fsck 2>out &&
+ cat out &&
+ grep "warning.*\\.git" out
+ )
+'
+
test_done