Philip Withnall authored Nov 09, 2016 and Philip Withnall committed Jan 19, 2017

This is an implementation of GeocodeBackend which returns results from
an in-memory map of parameters to result sets, for both forward and
reverse queries. That map is set up using API exposed by the
GeocodeMockBackend — so a unit test harness for an application or
library which uses geocode-glib can create a GeocodeMockBackend, set up
some expected queries in it, then test the application or library using
the mock GeocodeBackend instance.

This allows, for example, unit tests to be written which do not require
internet access, which is useful for many build and CI machines.
Secondly, it allows unit tests to reliably test the error paths in an
application or library’s code, as the map of queries can include error
values. This allows testing an application’s handling of network
timeouts, for example, which is otherwise tricky to set up (it requires
a network namespace and a mock server).

The GeocodeMockBackend is public API. Unit tests for it will be added in
a follow-up commit.

https://bugzilla.gnome.org/show_bug.cgi?id=774631