Add testing to the CI file

.gitlab-ci.yml

 image: fedora:latest
 stages:
   - build
+  - test
+
+before_script:
+  - dnf install -y gcc meson ninja-build
 
 build:
   stage: build
   script:
-  - dnf install -y gcc meson ninja-build
   - meson builddir
-  - ninja -C builddir
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+  - ninja -C builddir
+
+test:
+  stage: test
+  script:
+  - meson builddir
+  - ninja -C builddir
+  - meson test -C builddir --verbose
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