[core] harden OfflineDatabaseupstream/offlinedb-test

- gracefully handles unreadable or corrupt files
- gracefully handles temporary read or write errors, e.g. when the file system becomes unavailable
- gracefully handles full disks
- adds tests for all of these situations using a ramdisk for simulating full disks, or read only file systems

1 files changed, 0 insertions, 0 deletions

diff --git a/test/fixtures/offline_database/corrupt-delayed.db b/test/fixtures/offline_database/corrupt-delayed.db
new file mode 100644
index 0000000000..04989dbf36
--- /dev/null
+++ b/test/fixtures/offline_database/corrupt-delayed.db