Adds minimal repro script (#98)

* chore: creates minimal.lua to reproduce issues

* doc: adds testing section to readme

README.md

@@ -9,8 +9,10 @@
   - [Why another highlighter?](#why-another-highlighter)
   - [Customization](#customization)
     - [Updating color even when buffer is not focused](#updating-color-even-when-buffer-is-not-focused)
+  - [Testing](#testing)
   - [Extras](#extras)
   - [TODO](#todo)
+  - [Similar projects](#similar-projects)
   <!--toc:end-->
 
 [![luadoc](https://img.shields.io/badge/luadoc-0.1-blue)](https://nvchad.com/nvim-colorizer.lua/)
@@ -268,6 +270,18 @@ For lower level interface, see
 [LuaDocs for API details](https://nvchad.com/nvim-colorizer.lua/modules/colorizer.html)
 or use `:h colorizer` once installed.
 
+## Testing
+
+To test colorization with your config, edit `test/expect.txt` to see expected
+highlights
+
+For troubleshooting use `test/minimal.lua`. Edit the file to configure colorizer.
+Run `minimal.lua` to startup neovim:
+
+```bash
+nvim --clean -u minimal.lua expect.txt
+```
+
 ## Extras
 
 Documentaion is generated using ldoc. See

test/.gitignore

@@ -0,0 +1 @@
+colorizer_issue/

test/minimal.lua

@@ -0,0 +1,38 @@
+-- Run this file as `nvim --clean -u minimal.lua expect.txt`
+
+for name, url in pairs({
+  colorizer = "https://github.com/NvChad/nvim-colorizer.lua",
+}) do
+  local install_path = vim.fn.fnamemodify("colorizer_issue/" .. name, ":p")
+  if vim.fn.isdirectory(install_path) == 0 then
+    vim.fn.system({ "git", "clone", "--depth=1", url, install_path })
+  end
+  vim.opt.runtimepath:append(install_path)
+end
+
+-- Configure setup opts
+local opts = {
+  user_default_options = {
+    RGB = true,
+    RRGGBB = true,
+    names = true,
+    RRGGBBAA = true,
+    AARRGGBB = true,
+    rgb_fn = true,
+    hsl_fn = true,
+    css = true,
+    css_fn = true,
+    mode = "background",
+    tailwind = "lsp",
+    sass = {
+      enable = false,
+      parsers = { "css" },
+    },
+    virtualtext = "■",
+  },
+  buftypes = { "!prompt", "!popup" },
+  user_commands = true,
+}
+require("colorizer").setup(opts)
+
+-- ADD INIT.LUA SETTINGS _NECESSARY_ FOR REPRODUCING THE ISSUE