modules/test: check warnings/assertions

Warnings and assertions defined as `config.warnings` and `config.assertions`
respectively will be checked as part of the test derivation, instead of
when evaluating the modules.

Adds new `checkWarnings` and `checkAssertions` test options (default true).

lib/tests.nix

@@ -62,6 +62,9 @@ let
         extraSpecialArgs = {
           defaultPkgs = pkgs;
         } // extraSpecialArgs;
+        # Don't check assertions/warnings while evaluating nixvim config
+        # We'll let the test derivation handle that
+        check = false;
       };
     in
     result.config.test.derivation;