ci: add busted test infrastructure

.busted

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+return {
+  _all = {
+    coverage = false,
+    lpath = "lua/?.lua;lua/?/init.lua",
+    lua = "~/.luarocks/bin/nlua",
+  },
+  default = {
+    verbose = true
+  },
+  tests = {
+    verbose = true
+  },
+}

.github/workflows/tests.yml

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+---
+name: Run tests
+on:
+  pull_request: ~
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    name: Run tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        neovim_version: ['nightly', 'stable']
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Run tests
+        uses: nvim-neorocks/nvim-busted-action@v1
+        with:
+          nvim_version: ${{ matrix.neovim_version }}

CONTRIBUTING.md

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+## Running tests locally
+
+You can run tests locally,
+if you have [`luarocks`](https://luarocks.org/) or `busted` installed[^1].
+
+[^1]: The test suite assumes that `nlua` has been installed
+      using luarocks into `~/.luarocks/bin/`.
+
+You can then run:
+
+```bash
+luarocks test --local
+# or
+busted
+```
+
+Or if you want to run a single test file:
+
+```bash
+luarocks test spec/mytest_spec.lua --local
+# or
+busted spec/mytest_spec.lua
+```
+
+If you see a `module 'busted.runner'` not found error you need to update your `LUA_PATH`:
+
+```bash
+eval $(luarocks path --no-bin)
+busted --lua nlua spec/mytest_spec.lua
+```

neocomplete.nvim-scm-1.rockspec

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+rockspec_format = '3.0'
+package = "neocomplete.nvim"
+version = "scm-1"
+source = {
+  url = "git+https://github.com/max397574/neocomplete.nvim"
+}
+dependencies = {
+  "fzy",
+}
+test_dependencies = {
+  "nlua",
+  "fzy",
+}
+build = {
+  type = "builtin",
+  copy_directories = {
+    "docs",
+    "plugin",
+  },
+}

spec/example_spec.lua

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+describe('TODO: Add actual tests', function()
+  it('Test can access vim namespace', function()
+    assert.are.same(vim.trim('  a '), 'a')
+  end)
+end)