--- a/nix/jrsonnet.nix
+++ b/nix/jrsonnet.nix
@@ -14,12 +14,19 @@
 craneLib.buildPackage {
   src = lib.cleanSourceWith {
     src = ../.;
-    filter = path: type: (lib.hasSuffix "\.jsonnet" path) || (craneLib.filterCargoSources path type);
+    filter =
+      path: type:
+      (lib.hasSuffix "\.jsonnet" path)
+      || (lib.hasSuffix "\.ungram" path)
+      || (lib.hasSuffix "\.golden" path)
+      || (lib.hasSuffix "\.snap" path)
+      || (craneLib.filterCargoSources path type);
   };
   pname = "jrsonnet";
   version = "current${optionalString withExperimentalFeatures "-experimental"}";
 
   cargoExtraArgs = "--locked --features=mimalloc${optionalString withExperimentalFeatures ",experimental"}";
+  cargoTestExtraArgs = "--workspace";
 
   CPP_JSONNET_FOR_TESTS = cpp-jsonnet-for-tests;
   GO_JSONNET_FOR_TESTS = go-jsonnet-for-tests;