[geocode-glib/wip/hadess/zero-distance-test-case] tests: Add a zero distance test

[Bastien Nocera <hadess src gnome org>]

commit bb7807d358285c13064ad7848be343409be122bf
Author: Bastien Nocera <hadess hadess net>
Date:   Tue Oct 9 18:10:29 2018 +0200

    tests: Add a zero distance test
    
    The equivalent code in libgweather had a bug that made it return "nan"
    as a distance if the 2 set of coordinates were exactly the same. Test
    for this as well.

 geocode-glib/tests/geocode-glib.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/geocode-glib/tests/geocode-glib.c b/geocode-glib/tests/geocode-glib.c
index d90779d..ce26b3d 100644
--- a/geocode-glib/tests/geocode-glib.c
+++ b/geocode-glib/tests/geocode-glib.c
@@ -628,6 +628,19 @@ test_distance (void)
        g_assert_cmpfloat (geocode_location_get_distance_from (loca, locb) - 0.549311, <, 0.000001);
 }
 
+static void
+test_zero_distance (void)
+{
+       g_autoptr (GeocodeLocation) loca = NULL, locb = NULL;
+
+       /* 1600 Pennsylvania Ave NW, Washington, DC */
+       loca = geocode_location_new (38.898556, -77.037852, GEOCODE_LOCATION_ACCURACY_UNKNOWN);
+       /* 1600 Pennsylvania Ave NW, Washington, DC */
+       locb = geocode_location_new (38.898556, -77.037852, GEOCODE_LOCATION_ACCURACY_UNKNOWN);
+
+       g_assert_cmpfloat (geocode_location_get_distance_from (loca, locb), ==, 0.0);
+}
+
 static void
 test_locale_format (void)
 {
@@ -914,6 +927,7 @@ int main (int argc, char **argv)
                g_test_add_func ("/geocode/search", test_search);
                g_test_add_func ("/geocode/search_lat_long", test_search_lat_long);
                g_test_add_func ("/geocode/distance", test_distance);
+               g_test_add_func ("/geocode/zero_distance", test_zero_distance);
                g_test_add_func ("/geocode/osm_type", test_osm_type);
                return g_test_run ();
        }