[geary] Enable engine tests by default for building the deb package.

[Michael Gratton <mjog src gnome org>]

commit bdb41996c8a6df9230ab21abff4c5abf5cf8dc11
Author: Michael James Gratton <mike vee net>
Date:   Mon Dec 18 14:48:45 2017 +1100

    Enable engine tests by default for building the deb package.

 debian/rules |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/debian/rules b/debian/rules
index b0d799d..629d655 100755
--- a/debian/rules
+++ b/debian/rules
@@ -25,8 +25,7 @@ override_dh_auto_install:
        DESTDIR=${CURDIR}/debian/geary ninja -C debian/build install
 
 override_dh_auto_test:
-#      Disable for now since some tests require a GUI
-#      ninja -C debian/build test
+       meson test -C debian/build engine-tests
 
 override_dh_auto_clean:
        rm -fr debian/build