SearchIndexer is only automatically disabled in `before_all` and `before` blocks which means at the start
of test runs. Enabling the SearchIndexer in one `fab!` block will affect
all other `fab!` blocks which is not ideal as we may be indexing stuff
for search when we don't need to.
What is the problem?
The system tests incorrectly assumes that the discobot user which is
seeded by a core plugin will always be present. This is not true as the
discobot user will only be seeded when the test databases are migrated
with plugins enabled. If we migrate test databases without plugins being
enabled, the core system tests should still pass.
Due to the way templates work, the incorrect variable (user instead of item) was not causing any error, and just failing silently to display the avatar.
This commit is also providing a basic spec for completion of users and groups.
