diff --git a/example/zfs-with-vdevs.nix b/example/zfs-with-vdevs.nix
index cd85add..0058ac5 100644
--- a/example/zfs-with-vdevs.nix
+++ b/example/zfs-with-vdevs.nix
@@ -60,7 +60,7 @@
       };
       cache = {
         type = "disk";
-        device = "/dev/sdc";
+        device = "/dev/vdc";
         content = {
           type = "gpt";
           partitions = {
@@ -100,15 +100,14 @@
         };
 
         datasets = {
-            # See examples/zfs.nix for more comprehensive usage.
-            zfs_fs = {
-              type = "zfs_fs";
-              mountpoint = "/zfs_fs";
-              options."com.sun:auto-snapshot" = "true";
-            };
+          # See examples/zfs.nix for more comprehensive usage.
+          zfs_fs = {
+            type = "zfs_fs";
+            mountpoint = "/zfs_fs";
+            options."com.sun:auto-snapshot" = "true";
+          };
         };
       };
     };
   };
 }
-
diff --git a/example/zfs.nix b/example/zfs.nix
index 933386a..4d09061 100644
--- a/example/zfs.nix
+++ b/example/zfs.nix
@@ -100,4 +100,3 @@
     };
   };
 }
-
diff --git a/lib/types/zpool.nix b/lib/types/zpool.nix
index d3fcda4..b7e35d3 100644
--- a/lib/types/zpool.nix
+++ b/lib/types/zpool.nix
@@ -150,9 +150,9 @@ in
               topology=""
               # For shell check
               mode="${config.mode}"
-              if [ $mode != "prescribed" ]; then
-                ${if hasTopology then
-                  ''topology="${config.mode} \"''${zfs_devices}\""''
+              if [ "$mode" != "prescribed" ]; then
+                ${if !hasTopology then
+                  ''topology="${config.mode} ''${zfs_devices[*]}"''
                 else
                   ''
                   echo "topology cannot be set when mode != 'prescribed', skipping creating zpool ${config.name}" >&2
@@ -174,7 +174,6 @@ in
                   devs=''${line#*=}
                   IFS=' ' read -r -a devices <<< "$devs"
                   all_devices+=("''${devices[@]}")
-                  # shellcheck disable=SC2089
                   topology+=" ''${mode} ''${devices[*]}"
                 done
                 # all_devices sorted should equal zfs_devices sorted
@@ -188,7 +187,6 @@ in
               fi
             fi
             if [ $continue -eq 1 ]; then
-              # shellcheck disable=SC2090
               zpool create -f ${config.name} \
                 -R ${rootMountPoint} \
                 ${lib.concatStringsSep " " (lib.mapAttrsToList (n: v: "-o ${n}=${v}") config.options)} \
diff --git a/tests/zfs-with-vdevs.nix b/tests/zfs-with-vdevs.nix
new file mode 100644
index 0000000..5f8c67d
--- /dev/null
+++ b/tests/zfs-with-vdevs.nix
@@ -0,0 +1,24 @@
+{ pkgs ? import <nixpkgs> { }
+, diskoLib ? pkgs.callPackage ../lib { }
+}:
+diskoLib.testLib.makeDiskoTest {
+  inherit pkgs;
+  name = "zfs-with-vdevs";
+  disko-config = ../example/zfs-with-vdevs.nix;
+  extraInstallerConfig.networking.hostId = "8425e349";
+  extraSystemConfig = {
+    networking.hostId = "8425e349";
+  };
+  extraTestScript = ''
+    def assert_property(ds, property, expected_value):
+        out = machine.succeed(f"zfs get -H {property} {ds} -o value").rstrip()
+        assert (
+            out == expected_value
+        ), f"Expected {property}={expected_value} on {ds}, got: {out}"
+
+    assert_property("zroot", "compression", "zstd")
+    assert_property("zroot/zfs_fs", "com.sun:auto-snapshot", "true")
+    assert_property("zroot/zfs_fs", "compression", "zstd")
+    machine.succeed("mountpoint /zfs_fs");
+  '';
+}