tests: Add basic unit tests for fp-context

Link the tests with the private library using an utils library that will
be useful to share other tests functions

meson.build

@@ -199,10 +199,7 @@ if get_option('gtk-examples')
     subdir('demo')
 endif
 
-# The tests require introspeciton support to run
-if get_option('introspection')
-    subdir('tests')
-endif
+subdir('tests')
 
 pkgconfig = import('pkgconfig')
 pkgconfig.generate(