diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1fe6a74..efb8a6b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,39 +1,13 @@
 name: Tests
 
-on: [push, pull_request]
+on: [push, pull_request, workflow_call]
 
 jobs:
   x64-ubuntu:
-    name: X64-ubuntu
-    runs-on: ubuntu-24.04
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: ubuntu-24.04
-            url: https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz
-            manager: sudo apt-get
-            packages: -y fd-find tree-sitter-cli
+    name: nix-runner
+    runs-on: self-hosted
     steps:
-      - uses: actions/checkout@v3
-      - run: date +%F > todays-date
-      - name: Restore cache for today's nightly.
-        uses: actions/cache@v3
-        with:
-          path: _neovim
-          key: ${{ runner.os }}-${{ matrix.url }}-${{ hashFiles('todays-date') }}
-
-      - name: Prepare
-        run: |
-          ${{ matrix.manager }} update
-          ${{ matrix.manager }} install ${{ matrix.packages }}
-          test -d _neovim || {
-            mkdir -p _neovim
-            curl -sL ${{ matrix.url }} | tar xzf - --strip-components=1 -C "${PWD}/_neovim"
-          }
+      - uses: actions/checkout@v4
 
       - name: Run tests
-        run: |
-          export PATH="${PWD}/_neovim/bin:${PATH}"
-          export VIMRUNTIME="${PWD}/_neovim/share/nvim/runtime"
-          make test
+        run: make test
diff --git a/tests/minimal_init.lua b/tests/minimal_init.lua
index 5adae58..eba0f28 100644
--- a/tests/minimal_init.lua
+++ b/tests/minimal_init.lua
@@ -1,5 +1,8 @@
 local M = {}
 
+-- Ensure our test lua files are in `package.path`
+package.path = "?.lua;" .. package.path
+
 local utils = require("tests.utils.utils")
 local root = utils.paths.Root:push(".deps/")
 
@@ -136,7 +139,5 @@ end
 
 M.setup({
     ["plenary.nvim"] = "https://github.com/nvim-lua/plenary.nvim",
-    ["popup.nvim"] = "https://github.com/nvim-lua/popup.nvim",
     ["nvim-treesitter"] = "https://github.com/nvim-treesitter/nvim-treesitter",
-    ["playground"] = "https://github.com/nvim-treesitter/playground",
 })
diff --git a/tests/test.lua b/tests/test.lua
index f7aebcf..925189e 100644
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -1,3 +1,7 @@
+-- Ensure our test lua files are in `package.path`
+local fdir = vim.fn.fnamemodify(debug.getinfo(1, "S").source:sub(2), ":p:h:h")
+package.path = fdir .. "/?.lua;" .. package.path
+
 require("tests.minimal_init")
 
 ---@type string