Add ci tests

.github/workflows/ci.yml

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+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  x64-ubuntu:
+    name: X64-ubuntu
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - run: date +%F > todays-date
+      - name: Restore cache for today's nightly.
+        uses: actions/cache@v2
+        with:
+          path: |
+            _neovim
+          key: ${{ runner.os }}-x64-${{ hashFiles('todays-date') }}
+
+      - name: Prepare
+        run: |
+          sudo apt-get install sqlite3 libsqlite3-dev
+          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: |
+          curl -OL https://raw.githubusercontent.com/norcalli/bot-ci/master/scripts/github-actions-setup.sh
+          source github-actions-setup.sh nightly-x64
+          make test
+
+  appimage-ubuntu:
+    name: Appimage-ubuntu
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+      - run: date +%F > todays-date
+      - name: Restore cache for today's nightly.
+        uses: actions/cache@v2
+        with:
+          path: |
+            build
+          key: ${{ runner.os }}-appimage-${{ hashFiles('todays-date') }}
+
+      - name: Prepare
+        run: |
+          sudo apt-get install sqlite3 libsqlite3-dev
+          test -d build || {
+            mkdir -p build
+            wget https://github.com/neovim/neovim/releases/download/nightly/nvim.appimage
+            chmod +x nvim.appimage
+            mv nvim.appimage ./build/nvim
+          }
+          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}/build/:${PATH}"
+            make test

.github/workflows/lint.yml

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+name: Linting and style checking
+
+on: [push, pull_request]
+
+jobs:
+  luacheck:
+    name: Luacheck
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Prepare
+        run: |
+          sudo apt-get update
+          sudo apt-get install luarocks
+          sudo luarocks install luacheck
+
+      - name: Lint
+        run: sudo make lint

.luacheckrc

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+-- Re-run tests only if their modification time changed.
+cache = true
+std = luajit
+codes = true
+self = false
+
+-- Glorious list of warnings: https://luacheck.readthedocs.io/en/stable/warnings.html
+ignore = {
+  "212", -- Unused argument, In the case of callback function, _arg_name is easier to understand than _, so this option is set to off.
+  "122", -- Indirectly setting a readonly global
+}
+
+-- Global objects defined by the C code
+read_globals = {
+  "vim",
+}

Makefile

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+test:
+	nvim --headless -c 'PlenaryBustedDirectory lua/test/auto/'
+
+lint:
+	luacheck lua/

test/minimal_init.vim

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+set rtp+=.
+nn m<space> :PlenaryBustedDirectory test/auto/ { minimal_init = 'tests/minimal_init.vim' }<cr>