add tests

.github/workflows/test.yml

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+name: Tests
+
+on: [push, pull_request]
+
+jobs:
+  tests:
+    name: unit tests
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - os: ubuntu-latest
+            rev: nightly/nvim-linux64.tar.gz
+            manager: sudo apt-get
+            packages: -y ripgrep
+          - os: ubuntu-latest
+            rev: v0.9.0/nvim-linux64.tar.gz
+            manager: sudo apt-get
+            packages: -y ripgrep
+    steps:
+      - uses: actions/checkout@v3
+      - run: date +%F > todays-date
+      - name: Restore from todays cache
+        uses: actions/cache@v3
+        with:
+          path: _neovim
+          key: ${{ runner.os }}-${{ matrix.rev }}-${{ hashFiles('todays-date') }}
+
+      - name: Prepare
+        run: |
+          ${{ matrix.manager }} update
+          ${{ matrix.manager }} install ${{ matrix.packages }}
+          test -d _neovim || {
+            mkdir -p _neovim
+            curl -sL "https://github.com/neovim/neovim/releases/download/${{ matrix.rev }}" | tar xzf - --strip-components=1 -C "${PWD}/_neovim"
+          }
+          mkdir -p ~/.local/share/nvim/lazy
+          git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/lazy/plenary.nvim
+          ln -s $(pwd) ~/.local/share/nvim/lazy
+
+      - name: Run tests
+        run: |
+          export PATH="${PWD}/_neovim/bin:${PATH}"
+          export VIM="${PWD}/_neovim/share/nvim/runtime"
+          nvim --version
+          make test

.neoconf.json

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+{
+  "neodev": {
+    "library": {
+      "plugins": [
+        "plenary.nvim"
+      ]
+    }
+  }
+}

Makefile

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+MINIMAL_INIT := ./scripts/minimal_init.vim
+
+test:
+	nvim --headless --noplugin -u ${MINIMAL_INIT} \
+		-c "PlenaryBustedDirectory lua/ { minimal_init = '${MINIMAL_INIT}' }"
+

lua/unclutter/tabline_spec.lua

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+local M = require "unclutter.tabline"
+
+describe("Tabpage section", function()
+  it("creates tabpage section for multiple tabpages", function()
+    -- Mock vim.fn.tabpagenr
+    ---@diagnostic disable-next-line: duplicate-set-field
+    vim.fn.tabpagenr = function(arg)
+      if arg == "$" then
+        return 3
+      end -- total tabpages
+      return 2 -- current tabpage
+    end
+
+    M.make_tabpage_section()
+    assert.are.equal(" Tab 2/3 ", M.tabpage_section)
+  end)
+
+  it("creates no tabpage section for a single tabpage", function()
+    -- Mock vim.fn.tabpagenr
+    ---@diagnostic disable-next-line: duplicate-set-field
+    vim.fn.tabpagenr = function(arg)
+      if arg == "$" then
+        return 1
+      end
+      return 1
+    end
+
+    M.make_tabpage_section()
+    assert.are.equal("", M.tabpage_section)
+  end)
+end)
+
+describe("Buffer management", function()
+  before_each(function()
+    M.buffers_to_keep = {}
+  end)
+
+  it("keeps a buffer", function()
+    M.keep_buffer(1)
+    assert.is_true(M.is_buffer_kept(1))
+  end)
+
+  it("removes a buffer", function()
+    M.keep_buffer(1)
+    M.remove_buffer(1)
+    assert.is_false(M.is_buffer_kept(1))
+  end)
+
+  it("toggles a buffer", function()
+    M.toggle_buffer(1)
+    assert.is_true(M.is_buffer_kept(1))
+    M.toggle_buffer(1)
+    assert.is_false(M.is_buffer_kept(1))
+  end)
+end)

scripts/minimal_init.vim

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+let plenary_path = stdpath('data') . '/lazy/plenary.nvim/'
+execute 'set rtp+=' . plenary_path
+
+runtime! plugin/plenary.vim
+runtime! plugin/unclutter.lua
+