feat: add tests

.gitignore

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+.tests
+result
+result-*

tests/charm-freeze/test_all.lua

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+local ne = MiniTest.expect.no_error
+local e = MiniTest.expect.error
+local child = MiniTest.new_child_neovim()
+
+local T = MiniTest.new_set({
+  hooks = {
+    pre_case = function()
+      child.restart()
+      child.lua([[P = require('.///////lua/charm-freeze')]])
+    end,
+    -- Stop once all test cases are finished
+    post_once = child.stop,
+  },
+})
+
+-- We need to allow no options to be passed
+T["no_options"] = function()
+  ne(function()
+    child.lua([[P.setup({})]])
+  end)
+end
+
+-- These are invalid options, errors should be thrown by these
+T["invalid_options.string"] = function()
+  e(function()
+    child.lua([[P.setup({command = 1})]])
+  end)
+end
+
+T["invalid_options.number"] = function()
+  e(function()
+    child.lua([[P.setup({line_height = "chesee"})]])
+  end)
+end
+
+T["invalid_options.boolean"] = function()
+  e(function()
+    child.lua([[P.setup({line_numbers = "chesee"})]])
+  end)
+end
+
+T["invalid_options.table"] = function()
+  e(function()
+    child.lua([[P.setup({border = {1, 2, 3}})]])
+  end)
+end
+
+T["invalid_options.array"] = function()
+  e(function()
+    child.lua([[P.setup({padding = { "l" = "something", "r" = "something"}})]])
+  end)
+end
+
+T["invalid_options.function"] = function()
+  e(function()
+    child.lua([[P.setup({padding = function() return "./" .. os.date("%Y-%m-%d") .. "_freeze.png" end})]])
+  end)
+end
+
+T["invalid_options.unknown"] = function()
+  e(function()
+    child.lua([[P.setup({unknown = 1})]])
+  end)
+end
+
+-- Check valid options, no errors should be thrown by these
+T["vaild_options.string"] = function()
+  ne(function()
+    child.lua([[P.setup({theme = "charm"})]])
+  end)
+end
+
+T["valid_options.number"] = function()
+  ne(function()
+    child.lua([[P.setup({line_height = 1.2})]])
+  end)
+end
+
+T["valid_options.boolean"] = function()
+  ne(function()
+    child.lua([[P.setup({line_numbers = false})]])
+  end)
+end
+
+T["valid_options.array"] = function()
+  ne(function()
+    child.lua([[P.setup({padding = {20, 40, 20, 20}})]])
+  end)
+end
+
+T["valid_options.table"] = function()
+  ne(function()
+    child.lua([[P.setup({border = {radius = 8}})]])
+  end)
+end
+
+T["valid_options.function"] = function()
+  ne(function()
+    child.lua([[P.setup({output = function() return "./" .. os.date("%Y-%m-%d") .. "_freeze.png" end})]])
+  end)
+end
+
+return T

tests/init.lua

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+local M = {}
+
+function M.root(root)
+  local f = debug.getinfo(1, "S").source:sub(2)
+  return vim.fn.fnamemodify(f, ":p:h:h") .. "/" .. (root or "")
+end
+
+---@param plugin string
+function M.load(plugin)
+  local name = plugin:match(".*/(.*)")
+  local package_root = M.root(".tests/site/pack/deps/start/")
+  if not vim.loop.fs_stat(package_root .. name) then
+    print("Installing " .. plugin)
+    vim.fn.mkdir(package_root, "p")
+    vim.fn.system({
+      "git",
+      "clone",
+      "--depth=1",
+      "https://github.com/" .. plugin .. ".git",
+      package_root .. "/" .. name,
+    })
+  end
+end
+
+function M.setup()
+  vim.cmd([[set runtimepath=$VIMRUNTIME]])
+  vim.opt.runtimepath:append(M.root())
+  vim.opt.packpath = { M.root(".tests/site") }
+
+  -- Load a testing framework
+  M.load("echasnovski/mini.nvim")
+  require("mini.test").setup()
+
+  vim.env.XDG_CONFIG_HOME = M.root(".tests/config")
+  vim.env.XDG_DATA_HOME = M.root(".tests/data")
+  vim.env.XDG_STATE_HOME = M.root(".tests/state")
+  vim.env.XDG_CACHE_HOME = M.root(".tests/cache")
+end
+
+M.setup()

tests/run

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+#!/bin/sh
+
+nvim --headless --noplugin -u tests/init.lua -c "lua MiniTest.run()"