We put some effort into testing the built copy rather than some
installed copy. On the other hand for people like packagers, testing
the installed copy is also of interest.
When NOTMUCH_TEST_INSTALLED is set to a nonempty value, tests do not
require a built notmuch tree or running configure.
Some of the tests marked as broken when running against installed
notmuch are probably fixable.
The call to delete_document can throw exceptions (and can happen in
practice [1]), so catch the exception and extract the error
message. As a side effect, also move the call to _n_m_has_term inside
the try/catch. This should not change anything as that function
already traps any Xapian exceptions.
[1]: id:wwuk039sk2p.fsf@chaotikum.eu
In [1], Thomas Schneider reported an uncaught Xapian exception when
running out of disk space. We generate the same exception via database
corruption.
[1]: id:wwuk039sk2p.fsf@chaotikum.eu
In order for a database to actually be writeable, it must be the case that it
is open, not just the correct type of Xapian object. By explicitely
checking, we are able to provide better error reporting, in particular
for the previously broken test in T566-lib-message.
