diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..413af35
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,54 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  unit_tests:
+    name: unit tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - os: ubuntu-20.04
+          url: https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz
+          manager: sudo apt-get
+          packages: -y fd-find
+        - os: ubuntu-20.04
+          url: https://github.com/neovim/neovim/releases/download/v0.7.0/nvim-linux64.tar.gz
+          manager: sudo apt-get
+          packages: -y fd-find
+        - os: macos-10.15
+          url: https://github.com/neovim/neovim/releases/download/nightly/nvim-macos.tar.gz
+          manager: brew
+          packages: fd
+        - os: macos-10.15
+          url: https://github.com/neovim/neovim/releases/download/v0.7.0/nvim-macos.tar.gz
+          manager: brew
+          packages: fd
+    steps:
+    - uses: actions/checkout@v2
+    - run: date +%F > todays-date
+    - name: Restore from todays cache
+      uses: actions/cache@v2
+      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"
+        }
+        mkdir -p ~/.local/share/nvim/site/pack/vendor/start
+        git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
+        ln -s $(pwd) ~/.local/share/nvim/site/pack/vendor/start
+    - name: Run tests
+      run: |
+        export PATH="${PWD}/_neovim/bin:${PATH}"
+        export VIM="${PWD}/_neovim/share/nvim/runtime"
+        nvim --version
+        make test
diff --git a/Makefile b/Makefile
index 0e02f4c..d8e7650 100644
--- a/Makefile
+++ b/Makefile
@@ -1,2 +1,5 @@
+test:
+	nvim --headless --noplugin -u scripts/minimal_init.vim -c "PlenaryBustedDirectory lua/tests/ { minimal_init = './scripts/minimal_init.vim' }"
+
 lint:
 	luacheck lua/trim
diff --git a/lua/tests/test_spec.lua b/lua/tests/test_spec.lua
new file mode 100644
index 0000000..c790eb5
--- /dev/null
+++ b/lua/tests/test_spec.lua
@@ -0,0 +1,10 @@
+local eq = assert.are.same
+local trimmer = require 'trim.trimmer'
+local config = require 'trim.config'
+
+describe("trimmer.trim", function()
+  -- TODO
+  it("should be true", function()
+    eq(true, true)
+  end)
+end)
diff --git a/lua/trim/init.lua b/lua/trim/init.lua
index 1648e3e..4376398 100644
--- a/lua/trim/init.lua
+++ b/lua/trim/init.lua
@@ -1,5 +1,6 @@
 local vim = vim
 local config = require 'trim.config'
+local trimmer = require 'trim.trimmer'
 
 local M = {}
 
@@ -25,7 +26,7 @@ M.setup = function(cfg)
       pattern = '*',
       callback = function()
         if not has_value(cfg.disable, vim.bo.filetype) then
-          require 'trim.trimmer'.trim(cfg.patterns)
+          trimmer.trim(cfg.patterns)
         end
       end,
       group = 'TrimNvim'
diff --git a/lua/trim/trimmer.lua b/lua/trim/trimmer.lua
index c0415bc..9a03f7f 100644
--- a/lua/trim/trimmer.lua
+++ b/lua/trim/trimmer.lua
@@ -4,11 +4,11 @@ local api = vim.api
 local trimmer = {}
 
 trimmer.trim = function(patterns)
-    local save = vim.fn.winsaveview()
-    for _, v in pairs(patterns) do
-        api.nvim_exec(string.format("keepjumps keeppatterns silent! %s", v), false)
-    end
-    vim.fn.winrestview(save)
+	local save = vim.fn.winsaveview()
+	for _, v in pairs(patterns) do
+		api.nvim_exec(string.format("keepjumps keeppatterns silent! %s", v), false)
+	end
+	vim.fn.winrestview(save)
 end
 
 return trimmer
diff --git a/scripts/minimal_init.vim b/scripts/minimal_init.vim
new file mode 100644
index 0000000..da29e2f
--- /dev/null
+++ b/scripts/minimal_init.vim
@@ -0,0 +1,4 @@
+set rtp+=.
+set rtp+=../plenary.nvim/
+
+runtime! plugin/plenary.vim