diff --git a/testing/it.nix b/testing/it.nix
index 194b97b..c733c8f 100644
--- a/testing/it.nix
+++ b/testing/it.nix
@@ -1,5 +1,5 @@
 msg:
-{ actual, expected, asString ? false, asJSON ? false, removeDunders ? false, }:
+{ actual, expected, asString ? false, asJSON ? false, removeDunders ? false, safeToPrint ? true }:
 let
   preProcess = v:
     if removeDunders then
@@ -21,4 +21,5 @@ builtins.trace actual
 builtins.trace expected
 ''
   echo FAILED ${msg} 
+  echo '${if safeToPrint then builtins.toJSON actual else ""}'
 ''
diff --git a/testing/site.test.nix b/testing/site.test.nix
index 734b7d5..b5d8c16 100644
--- a/testing/site.test.nix
+++ b/testing/site.test.nix
@@ -218,4 +218,21 @@ in with site; [
     };
   }))
 
+  (it "copies all the files" ({
+    actual = copyTo "." {
+      page = "this is a page";
+      subdir = {
+        page = "this page is in a subdir";
+        link = ./src;
+      };
+    };
+    expected = ''
+      cp /nix/store/crirfz0n6f8dgl1si3x7pwyw7fqm0r8l-page ./page
+       mkdir -p ./subdir
+      cp -r /nix/store/q95cn7ccixzi9w22aic4bl0ykk40ka7v-src ./subdir/link
+       cp /nix/store/ic6fyy8wg8r4338a3m5kinmg11igxsyj-page ./subdir/page
+
+    '';
+  }))
+
 ]