This commit adds these two tests:
test_use_first_unread_anchor_with_some_unread_messages
test_use_first_unread_anchor_with_no_unread_messages
The new tests add coverage to the conditional logic in
get_old_messages_backend() that looks at first_unread_result
when use_first_unread_anchor is set to True.
The test is now called test_use_first_unread_anchor_with_muted_topics().
Before this commit, the test exercised setting
use_first_unread_anchor to True, but it didn't inspect the
most relevant query affected by the flag. Now it does.
This test is still kind of hard to read, and it's far from ideal,
but I'm reluctant to remove it from the test suite.
This increases test coverage by exercising highlight_string().
It also gives deeper test coverage to NarrowBuilder.by_search(),
which had test coverage before, but only in terms of inspecting
the SQL that was generated. This test actually runs the SQL
under the hood.
This partly fixes#1006.
Steve Howell
Tim Abbott
Eklavya Sharma