diff --git a/tests/lib-tests.nix b/tests/lib-tests.nix
index fde833c2..7eb3ab3c 100644
--- a/tests/lib-tests.nix
+++ b/tests/lib-tests.nix
@@ -343,8 +343,8 @@ else
       results = pkgs.lib.concatStringsSep "\n" (
         builtins.map (result: ''
           ${result.name}:
-            expected: ${result.expected}
-            result: ${result.result}
+            expected: ${lib.generators.toPretty { } result.expected}
+            result: ${lib.generators.toPretty { } result.result}
         '') results
       );
     }