improve testing infra

flake.nix

@@ -222,9 +222,24 @@
         };
       };
 
-      tests = import ./tests/tests.nix {
+      packages.${system} =
+        let
+          testSuite = import ./tests/tests.nix {
             inherit pkgs lib;
             config = self.nixosConfigurations.muffin.config;
           };
+        in
+        {
+          tests = pkgs.linkFarm "all-tests" (
+            pkgs.lib.mapAttrsToList (name: test: {
+              name = name;
+              path = test;
+            }) testSuite
+          );
+        }
+        // (pkgs.lib.mapAttrs' (name: test: {
+          name = "test-${name}";
+          value = test;
+        }) testSuite);
     };
 }