[gimp] gitlab-ci: run unit tests for meson builds.

[Jehan <jehanp src gnome org>]

commit 39f7dd269d2d08080371f0b9877e8006d3eef592
Author: Jehan <jehan girinstud io>
Date:   Fri Jan 3 22:55:09 2020 +0100

    gitlab-ci: run unit tests for meson builds.
    
    Not because they are working better than the ones in autotools, but
    rather because it seems they are simply barely implemented! So of
    course, the few tests currently there work.

 .gitlab-ci.yml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 45e6d0a75c..c33030cdb4 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -148,7 +148,7 @@ gimp-debian/testing-meson:
       -Djavascript=always
       -Dlua=always
     - ninja -C _build
-    # - ninja test
+    - ninja -C _build test
 
 gimp-debian/testing-clang:
   extends: .gimp-debian/testing-base
@@ -164,7 +164,7 @@ gimp-debian/testing-clang:
       -Djavascript=always
       -Dlua=always
     - ninja -C _build
-    # - ninja test
+    - ninja -C _build test
 
 ## WINDOWS 64-bit CI ##