Part of https://gitlab.gnome.org/GNOME/Initiatives/issues/1;
Sets up dual installation for flatpaks, allowing us to
build and run geary without affecting our system install.
This will allow testing of nightlies and CI artifacts as well
via the flatpak, so we can iterate on designs and share
bundles to test with.
* test/api/*.vala: Renamed files that contained mock objects to *-mock.vala,
not *-test.vala.
* test/testcase.vala: Renamed to test-case.vala for consistency, remove
TestCase class from Gee package since that's really not true. Clean up
code for consistency.
* test/meson.build, test/CMakeLists.txt: Split TestCase compilation out
into a separate test lib.
* test/client/application/geary-configuration-test.vala: New unit test
for Configuration class.
* test/main.vala: Add new unit test to the client suite, ensure the
memory GSettings backend is used as the default so we get default
setting values, and never save any changes made.
* test/CMakeLists.txt: Add new unit test source.
* src/client/application/geary-config.vala: Tidy up code a bit to adhere
to code conventions.
