tests: Add basic unit test based on virtual_image device

tests/meson.build

@@ -0,0 +1,17 @@
+envs = environment()
+envs.set('G_DEBUG', 'fatal-warnings')
+envs.set('G_MESSAGES_DEBUG', 'all')
+envs.set('MESON_SOURCE_ROOT', meson.build_root())
+envs.prepend('GI_TYPELIB_PATH', join_paths(meson.build_root(), 'libfprint'))
+envs.prepend('LD_LIBRARY_PATH', join_paths(meson.build_root(), 'libfprint'))
+envs.set('NO_AT_BRIDGE', '1')
+
+if 'virtual_image' in drivers
+    test(
+        'virtual-image',
+        find_program('virtual-image.py'),
+        args: '--verbose',
+        env: envs,
+    )
+endif
+