diff --git a/tests/test-sources/plugins/bufferlines/bufferline.nix b/tests/test-sources/plugins/bufferlines/bufferline.nix
index 14b83b4bbf..1a2437cc3f 100644
--- a/tests/test-sources/plugins/bufferlines/bufferline.nix
+++ b/tests/test-sources/plugins/bufferlines/bufferline.nix
@@ -1,3 +1,4 @@
+{ lib, pkgs, ... }:
 {
   empty = {
     plugins.bufferline.enable = true;
@@ -124,10 +125,70 @@
     };
   };
 
-  no-packages = {
+  default-packages = cfg: {
+    plugins.bufferline = {
+      enable = true;
+    };
+
+    assertions = [
+      {
+        assertion =
+          cfg.config.extraPlugins != [ ]
+          -> lib.any (
+            x:
+            lib.trace "${x.pname or x.name}" x.pname or x.name != null
+            && x.pname or x.name == "nvim-web-devicons"
+          ) cfg.config.extraPlugins;
+        message = "nvim-web-devicons package wasn't found when it was expected";
+      }
+    ];
+  };
+
+  no-packages = cfg: {
     plugins.bufferline = {
       enable = true;
       iconsPackage = null;
     };
+
+    assertions = [
+      {
+        assertion =
+          cfg.config.extraPlugins != [ ]
+          -> lib.any (
+            x:
+            lib.trace "${x.pname or x.name}" x.pname or x.name != null
+            && x.pname or x.name != "nvim-web-devicons"
+          ) cfg.config.extraPlugins;
+        message = "nvim-web-devicons package was found when it wasn't expected";
+      }
+    ];
+  };
+
+  package-overrides = cfg: {
+    plugins.bufferline = {
+      enable = true;
+      iconsPackage = pkgs.vimPlugins.mini-nvim;
+    };
+
+    assertions = [
+      {
+        assertion =
+          cfg.config.extraPlugins != [ ]
+          -> lib.any (
+            x: lib.trace "${x.pname or x.name}" x.pname or x.name != null && x.pname or x.name == "mini.nvim"
+          ) cfg.config.extraPlugins;
+        message = "mini-nvim package wasn't found when it was expected";
+      }
+      {
+        assertion =
+          cfg.config.extraPlugins != [ ]
+          -> lib.any (
+            x:
+            lib.trace "${x.pname or x.name}" x.pname or x.name != null
+            && x.pname or x.name != "nvim-web-devicons"
+          ) cfg.config.extraPlugins;
+        message = "nvim-web-devicons package was found when it wasn't expected";
+      }
+    ];
   };
 }