diff --git a/plugins/by-name/fff/default.nix b/plugins/by-name/fff/default.nix
index 68106bd9..b4fe6922 100644
--- a/plugins/by-name/fff/default.nix
+++ b/plugins/by-name/fff/default.nix
@@ -5,6 +5,7 @@ lib.nixvim.plugins.mkNeovimPlugin {
   description = "A fast fuzzy file finder.";
 
   maintainers = [ lib.maintainers.GaetanLepage ];
+  callSetup = "optional";
 
   settingsExample = {
     base_path = lib.nixvim.nestedLiteralLua "vim.fn.getcwd()";
diff --git a/tests/test-sources/plugins/by-name/fff/default.nix b/tests/test-sources/plugins/by-name/fff/default.nix
index ee48af7a..6dcd36db 100644
--- a/tests/test-sources/plugins/by-name/fff/default.nix
+++ b/tests/test-sources/plugins/by-name/fff/default.nix
@@ -1,120 +1,147 @@
 { lib }:
 {
-  empty = {
-    plugins.fff.enable = true;
-  };
+  empty =
+    { config, ... }:
+    {
+      plugins.fff.enable = true;
 
-  example = {
-    plugins.fff = {
-      enable = true;
-
-      settings = {
-        base_path = lib.nixvim.mkRaw "vim.fn.getcwd()";
-        max_results = 100;
-        layout = {
-          height = 0.8;
-          width = 0.8;
-          preview_position = "right";
-        };
-        key_bindings = {
-          close = [
-            "<Esc>"
-            "<C-c>"
-          ];
-          select_file = "<CR>";
-          open_split = "<C-s>";
-          open_vsplit = "<C-v>";
-          open_tab = "<C-t>";
-          move_up = [
-            "<Up>"
-            "<C-p>"
-          ];
-          move_down = [
-            "<Down>"
-            "<C-n>"
-          ];
-        };
-
-      };
+      assertions = [
+        {
+          assertion = !(lib.hasInfix "require('fff').setup(" config.content);
+          message = "Empty fff config should not emit a setup call.";
+        }
+      ];
     };
-  };
 
-  defaults = {
-    plugins.fff = {
-      enable = true;
+  example =
+    { config, ... }:
+    {
+      plugins.fff = {
+        enable = true;
+
+        settings = {
+          base_path = lib.nixvim.mkRaw "vim.fn.getcwd()";
+          max_results = 100;
+          layout = {
+            height = 0.8;
+            width = 0.8;
+            preview_position = "right";
+          };
+          key_bindings = {
+            close = [
+              "<Esc>"
+              "<C-c>"
+            ];
+            select_file = "<CR>";
+            open_split = "<C-s>";
+            open_vsplit = "<C-v>";
+            open_tab = "<C-t>";
+            move_up = [
+              "<Up>"
+              "<C-p>"
+            ];
+            move_down = [
+              "<Down>"
+              "<C-n>"
+            ];
+          };
 
-      settings = {
-        base_path = lib.nixvim.mkRaw "vim.fn.getcwd()";
-        prompt = "🪿 ";
-        title = "FFFiles";
-        max_results = 100;
-        max_threads = 4;
-        lazy_sync = true;
-        layout = {
-          height = 0.8;
-          width = 0.8;
-          prompt_position = "bottom";
-          preview_position = "right";
-          preview_size = 0.5;
         };
-        preview = {
-          enabled = true;
-          max_size = lib.nixvim.mkRaw "10 * 1024 * 1024";
-          chunk_size = 8192;
-          binary_file_threshold = 1024;
-          imagemagick_info_format_str = "%m: %wx%h, %[colorspace], %q-bit";
-          line_numbers = false;
-          wrap_lines = false;
-          show_file_info = true;
-          filetypes = {
-            svg.wrap_lines = true;
-            markdown.wrap_lines = true;
-            text.wrap_lines = true;
+      };
+
+      assertions = [
+        {
+          assertion = lib.hasInfix "require('fff').setup(" config.content;
+          message = "Configured fff should still emit a setup call.";
+        }
+      ];
+    };
+
+  defaults =
+    { config, ... }:
+    {
+      plugins.fff = {
+        enable = true;
+
+        settings = {
+          base_path = lib.nixvim.mkRaw "vim.fn.getcwd()";
+          prompt = "🪿 ";
+          title = "FFFiles";
+          max_results = 100;
+          max_threads = 4;
+          lazy_sync = true;
+          layout = {
+            height = 0.8;
+            width = 0.8;
+            prompt_position = "bottom";
+            preview_position = "right";
+            preview_size = 0.5;
+          };
+          preview = {
+            enabled = true;
+            max_size = lib.nixvim.mkRaw "10 * 1024 * 1024";
+            chunk_size = 8192;
+            binary_file_threshold = 1024;
+            imagemagick_info_format_str = "%m: %wx%h, %[colorspace], %q-bit";
+            line_numbers = false;
+            wrap_lines = false;
+            show_file_info = true;
+            filetypes = {
+              svg.wrap_lines = true;
+              markdown.wrap_lines = true;
+              text.wrap_lines = true;
+            };
+          };
+          keymaps = {
+            close = "<Esc>";
+            select = "<CR>";
+            select_split = "<C-s>";
+            select_vsplit = "<C-v>";
+            select_tab = "<C-t>";
+            move_up = [
+              "<Up>"
+              "<C-p>"
+            ];
+            move_down = [
+              "<Down>"
+              "<C-n>"
+            ];
+            preview_scroll_up = "<C-u>";
+            preview_scroll_down = "<C-d>";
+            toggle_debug = "<F2>";
+          };
+          hl = {
+            border = "FloatBorder";
+            normal = "Normal";
+            cursor = "CursorLine";
+            matched = "IncSearch";
+            title = "Title";
+            prompt = "Question";
+            active_file = "Visual";
+            frecency = "Number";
+            debug = "Comment";
+          };
+          frecency = {
+            enabled = true;
+            db_path = lib.nixvim.mkRaw "vim.fn.stdpath('cache') .. '/fff_nvim'";
+          };
+          debug = {
+            enabled = false;
+            show_scores = false;
+          };
+          logging = {
+            enabled = true;
+            log_file = lib.nixvim.mkRaw "vim.fn.stdpath('log') .. '/fff.log'";
+            log_level = "info";
           };
         };
-        keymaps = {
-          close = "<Esc>";
-          select = "<CR>";
-          select_split = "<C-s>";
-          select_vsplit = "<C-v>";
-          select_tab = "<C-t>";
-          move_up = [
-            "<Up>"
-            "<C-p>"
-          ];
-          move_down = [
-            "<Down>"
-            "<C-n>"
-          ];
-          preview_scroll_up = "<C-u>";
-          preview_scroll_down = "<C-d>";
-          toggle_debug = "<F2>";
-        };
-        hl = {
-          border = "FloatBorder";
-          normal = "Normal";
-          cursor = "CursorLine";
-          matched = "IncSearch";
-          title = "Title";
-          prompt = "Question";
-          active_file = "Visual";
-          frecency = "Number";
-          debug = "Comment";
-        };
-        frecency = {
-          enabled = true;
-          db_path = lib.nixvim.mkRaw "vim.fn.stdpath('cache') .. '/fff_nvim'";
-        };
-        debug = {
-          enabled = false;
-          show_scores = false;
-        };
-        logging = {
-          enabled = true;
-          log_file = lib.nixvim.mkRaw "vim.fn.stdpath('log') .. '/fff.log'";
-          log_level = "info";
-        };
       };
+
+      assertions = [
+        {
+          assertion = lib.hasInfix "require('fff').setup(" config.content;
+          message = "Configured fff defaults should emit a setup call.";
+        }
+      ];
     };
-  };
 }