diff --git a/nixos/tests/caddy.nix b/nixos/tests/caddy.nix
index ab9d2fbf4d1..fc10df0c79b 100644
--- a/nixos/tests/caddy.nix
+++ b/nixos/tests/caddy.nix
@@ -1,4 +1,4 @@
-import ./make-test.nix ({ pkgs, ... }: {
+import ./make-test-python.nix ({ pkgs, ... }: {
   name = "caddy";
   meta = with pkgs.stdenv.lib.maintainers; {
     maintainers = [ xfix ];
@@ -50,33 +50,38 @@ import ./make-test.nix ({ pkgs, ... }: {
     etagSystem = "${nodes.webserver.config.system.build.toplevel}/fine-tune/child-1";
     justReloadSystem = "${nodes.webserver.config.system.build.toplevel}/fine-tune/child-2";
   in ''
-    my $url = 'http://localhost/example.html';
-    $webserver->waitForUnit("caddy");
-    $webserver->waitForOpenPort("80");
+    url = "http://localhost/example.html"
+    webserver.wait_for_unit("caddy")
+    webserver.wait_for_open_port("80")
 
-    sub checkEtag {
-      my $etag = $webserver->succeed(
-        'curl -v '.$url.' 2>&1 | sed -n -e "s/^< [Ee][Tt][Aa][Gg]: *//p"'
-      );
-      $etag =~ s/\r?\n$//;
-      my $httpCode = $webserver->succeed(
-        'curl -w "%{http_code}" -X HEAD -H \'If-None-Match: '.$etag.'\' '.$url
-      );
-      die "HTTP code is not 304" unless $httpCode == 304;
-      return $etag;
-    }
 
-    subtest "check ETag if serving Nix store paths", sub {
-      my $oldEtag = checkEtag;
-      $webserver->succeed("${etagSystem}/bin/switch-to-configuration test >&2");
-      $webserver->sleep(1); # race condition
-      my $newEtag = checkEtag;
-      die "Old ETag $oldEtag is the same as $newEtag" if $oldEtag eq $newEtag;
-    };
+    def check_etag(url):
+        etag = webserver.succeed(
+            "curl -v '{}' 2>&1 | sed -n -e \"s/^< [Ee][Tt][Aa][Gg]: *//p\"".format(url)
+        )
+        etag = etag.replace("\r\n", " ")
+        http_code = webserver.succeed(
+            "curl -w \"%{{http_code}}\" -X HEAD -H 'If-None-Match: {}' {}".format(etag, url)
+        )
+        assert int(http_code) == 304, "HTTP code is not 304"
+        return etag
 
-    subtest "config is reloaded on nixos-rebuild switch", sub {
-      $webserver->succeed("${justReloadSystem}/bin/switch-to-configuration test >&2");
-      $webserver->waitForOpenPort("8080");
-    };
+
+    with subtest("check ETag if serving Nix store paths"):
+        old_etag = check_etag(url)
+        webserver.succeed(
+            "${etagSystem}/bin/switch-to-configuration test >&2"
+        )
+        webserver.sleep(1)
+        new_etag = check_etag(url)
+        assert old_etag != new_etag, "Old ETag {} is the same as {}".format(
+            old_etag, new_etag
+        )
+    
+    with subtest("config is reloaded on nixos-rebuild switch"):
+        webserver.succeed(
+            "${justReloadSystem}/bin/switch-to-configuration test >&2"
+        )
+        webserver.wait_for_open_port("8080")
   '';
 })