ci: add GitHub Actions workflow and minimal test suite

tests/test_init.lua

@@ -0,0 +1,55 @@
+local T = MiniTest.new_set()
+local eq = MiniTest.expect.equality
+
+-- ── Setup tests ───────────────────────────────────────────────────────
+
+T["setup"] = MiniTest.new_set()
+
+T["setup"]["creates user command with default name"] = function()
+  -- plugin/ auto-loaded via minimal_init, so PackUpdate should exist
+  local cmds = vim.api.nvim_get_commands({})
+  eq(cmds["PackUpdate"] ~= nil, true)
+end
+
+T["setup"]["respects custom command name"] = function()
+  require("tiny-packupdate").setup({ command = "PlugSync" })
+  local cmds = vim.api.nvim_get_commands({})
+  eq(cmds["PlugSync"] ~= nil, true)
+  -- Cleanup: delete the custom command
+  vim.api.nvim_del_user_command("PlugSync")
+end
+
+T["setup"]["is idempotent"] = function()
+  -- Calling setup twice should not error
+  require("tiny-packupdate").setup()
+  require("tiny-packupdate").setup()
+  local cmds = vim.api.nvim_get_commands({})
+  eq(cmds["PackUpdate"] ~= nil, true)
+end
+
+T["setup"]["sets highlight group"] = function()
+  require("tiny-packupdate").setup()
+  local hl = vim.api.nvim_get_hl(0, { name = "TinyPackProgress" })
+  eq(hl.link ~= nil or hl.fg ~= nil, true)
+end
+
+-- ── Timestamp tests ───────────────────────────────────────────────────
+
+T["timestamp"] = MiniTest.new_set()
+
+T["timestamp"]["roundtrip read/write"] = function()
+  local path = vim.fn.stdpath("data") .. "/tiny-packupdate-last"
+  -- Write a known timestamp
+  local f = io.open(path, "w")
+  f:write("1700000000")
+  f:close()
+  -- Read it back through the module's stamp path
+  local f2 = io.open(path, "r")
+  local val = tonumber(f2:read("*a"))
+  f2:close()
+  eq(val, 1700000000)
+  -- Cleanup
+  os.remove(path)
+end
+
+return T