diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 1a443c1..e1454e6 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -11,29 +11,11 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 jobs:
-  tests-ubuntu:
+  run-tests:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest]
-    steps:
-    - uses: actions/checkout@v5
-    - uses: DeterminateSystems/nix-installer-action@main
-      with:
-        github-token: ${{ secrets.GITHUB_TOKEN }}
-    - uses: cachix/cachix-action@v16
-      with:
-        name: rde
-        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-        extraPullNames: rstats-on-nix, nix-community
-    - run: nix build .
-    - run: nix flake check . --all-systems
-    - run: nix develop -c Rscript test/test.R
-  test-darwin:
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [macos-latest]
+        os: [ubuntu-latest, macos-latest]
     steps:
     - uses: actions/checkout@v5
     - uses: DeterminateSystems/nix-installer-action@main
diff --git a/flake.nix b/flake.nix
index 7a42495..0d28ab4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -27,28 +27,30 @@
       extraRPackages = let
         fetchfromGitHubJSONFile = path: prev.fetchFromGitHub (builtins.fromJSON (builtins.readFile path));
       in {
-        ## f
+        ## F
         fwildclusterboot = prev.rPackages.buildRPackage {
           name = "fwildclusterboot";
           src = fetchfromGitHubJSONFile ./versions/fwildclusterboot.json;
-          propagatedBuildInputs = builtins.attrValues {
-            inherit
-              (prev.rPackages)
-              collapse
-              dqrng
-              dreamerr
-              Formula
-              generics
-              gtools
-              JuliaConnectoR
-              Matrix
-              Rcpp
-              rlang
-              summclust
-              RcppArmadillo
-              RcppEigen
-              ;
-          };
+          propagatedBuildInputs =
+            builtins.attrValues {
+              inherit
+                (prev.rPackages)
+                collapse
+                dqrng
+                dreamerr
+                Formula
+                generics
+                gtools
+                JuliaConnectoR
+                Matrix
+                Rcpp
+                rlang
+                summclust
+                RcppArmadillo
+                RcppEigen
+                ;
+            }
+            ++ [(prev.julia-bin.withPackages ["WildBootTests"])];
         };
 
         ## H
diff --git a/test/test.R b/test/test.R
index 76f3bbe..ff36dc0 100644
--- a/test/test.R
+++ b/test/test.R
@@ -12,7 +12,23 @@ boot_lm <- boottest(
   param = "treatment",
   B = 999
 )
+boot_lmjl <- boottest(
+  lm_fit,
+  clustid = "group_id1",
+  param = "treatment",
+  B = 999,
+  engine = "WildBootTests.jl"
+)
+setBoottest_engine("WildBootTests.jl")
+boot_lmjl2 <- boottest(
+  lm_fit, 
+  clustid = "group_id1",
+  param = "treatment",
+  B = 999
+)
 summary(boot_lm)
+summary(boot_lmjl)
+summary(boot_lmjl2)
 
 cat("\n============================================================ httpgd ============================================================\n")
 library(httpgd)