adding tests

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  workflow_dispatch:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        neovim-version: ["stable", "nightly"]
+        lua-version: ["5.1", "5.4"]
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+
+      - name: Set up Lua
+        uses: leafo/gh-actions-lua@v9
+        with:
+          luaVersion: ${{ matrix.lua-version }}
+
+      - name: Install luacheck
+        run: luarocks install --local luacheck
+
+      - name: Run luacheck
+        run: |
+          ~/.luarocks/bin/luacheck lua
+
+      - name: Set up Neovim
+        uses: rhysd/action-setup-vim@v2
+        with:
+          neovim: ${{ matrix.neovim-version }}
+
+      - name: Install Dependencies
+        run: |
+          nvim --headless +'!mkdir -p ~/.local/share/nvim/site/pack/plugins/start' +qall
+          git clone --depth 1 https://github.com/nvim-lua/plenary.nvim \
+            ~/.local/share/nvim/site/pack/plugins/start/plenary.nvim
+
+      - name: Run Tests
+        run: |
+          nvim --headless \
+            -u tests/minimal_init.vim \
+            -c "PlenaryBustedDirectory tests/ { minimal_init = './tests/minimal_init.vim' }"

tests/minimal_init.vim

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+" tests/minimal_init.vim
+
+set runtimepath+=.
+set runtimepath+=~/.local/share/nvim/site/pack/plugins/start/plenary.nvim
+
+" Load your plugin
+runtime plugin/colorful-times.lua