mason-conform.nvim/tests/smoke_test.lua

-- Smoke test for mason-conform.nvim with stubbed mason/conform.
-- Run from the repository root: nvim -l tests/smoke_test.lua
local script = (arg and arg[0]) or "tests/smoke_test.lua"
local root = script:match("^(.*)/tests/") or "."
package.path = ("%s/lua/?.lua;%s/lua/?/init.lua;"):format(root, root) .. package.path

local failures = {}
local function check(cond, msg)
    if not cond then
        failures[#failures + 1] = msg
        print("FAIL: " .. msg)
    else
        print("ok:   " .. msg)
    end
end

-- ---- stubs -------------------------------------------------------------
local notifications = {}
local install_calls = {}
local installed = {}
local installing = {}

package.preload["conform"] = function()
    return {
        formatters_by_ft = {
            lua = { "stylua" },
            python = { "autopep8", lsp_format = "fallback", stop_after_first = true },
            markdown = { { "prettierd", "prettier" }, "cbfmt" },
            javascript = function()
                error("needs a buffer")
            end,
            go = function()
                return { "gofumpt" }
            end,
        },
    }
end

package.preload["mason-registry"] = function()
    local registry = {}
    function registry.refresh(cb)
        if cb then
            cb(true, {})
        end
    end
    function registry.get_package(name)
        if name == "not-in-registry" then
            error(('Cannot find package "%q".'):format(name))
        end
        local pkg = { name = name }
        function pkg:is_installed()
            return installed[name] or false
        end
        function pkg:is_installing()
            return installing[name] or false
        end
        function pkg:install(opts)
            install_calls[#install_calls + 1] = { name = name, version = opts and opts.version }
            local handle = {}
            function handle:once(event, cb2)
                assert(event == "closed")
                installed[name] = true
                cb2()
            end
            return handle
        end
        return pkg
    end
    return registry
end

package.preload["mason-core.package"] = function()
    local Package = {}
    function Package.Parse(identifier)
        local name, version = identifier:match("^([^@]+)@?(.*)$")
        if version == "" then
            version = nil
        end
        return name, version
    end
    return Package
end

package.preload["mason.version"] = function()
    return { MAJOR_VERSION = 2, MINOR_VERSION = 3 }
end

local original_notify = vim.notify
vim.notify = function(msg, level)
    notifications[#notifications + 1] = { msg = msg, level = level or vim.log.levels.INFO }
end

-- ---- tests -------------------------------------------------------------

-- setup() with defaults
local mc = require("mason-conform")
mc.setup()
vim.wait(200)
check(vim.deep_equal(mc.config, { ignore_install = {} }), "setup() without opts keeps defaults")

local function installed_names()
    local names = {}
    for _, call in ipairs(install_calls) do
        names[#names + 1] = call.name
    end
    table.sort(names)
    return names
end

check(
    vim.deep_equal(installed_names(), { "autopep8", "cbfmt", "gofumpt", "prettier", "prettierd", "stylua" }),
    "installs mapped formatters from every formatters_by_ft shape; skips broken function: "
        .. table.concat(installed_names(), ",")
)

-- setup() again with ignore_install
install_calls = {}
notifications = {}
installed = {}
mc.setup({ ignore_install = { "prettierd" } })
vim.wait(200)
check(
    vim.deep_equal(installed_names(), { "autopep8", "cbfmt", "gofumpt", "prettier", "stylua" }),
    "ignore_install is respected: " .. table.concat(installed_names(), ",")
)
check(vim.deep_equal(mc.config.ignore_install, { "prettierd" }), "ignore_install stored")

-- installed / installing packages are skipped
install_calls = {}
installed = {}
installing = {}
installed["stylua"] = true
installing["autopep8"] = true
mc.setup({ ignore_install = {} })
vim.wait(200)
check(
    vim.deep_equal(installed_names(), { "cbfmt", "gofumpt", "prettier", "prettierd" }),
    "already installed/installing packages are skipped: " .. table.concat(installed_names(), ",")
)

-- unknown mason package -> warning, no error
local install = require("mason-conform.install")
notifications = {}
local ok = pcall(install.try_install, "not-in-registry")
check(ok, "try_install on unknown package does not raise")
check(#notifications == 1 and notifications[1].level == vim.log.levels.WARN, "unknown package emits a warning")
check(
    notifications[1] and notifications[1].msg:find("not%-in%-registry", 1, false) ~= nil,
    "warning names the formatter"
)

-- version pinning passes through Package.Parse
installed = {}
install_calls = {}
install.try_install("stylua@1.2.0")
check(install_calls[1] and install_calls[1].version == "1.2.0", "version suffix forwarded to mason")

-- setup() validates its argument
ok = pcall(mc.setup, "not a table")
check(not ok, "setup() rejects non-table opts")

-- health check runs
local health_ok, err = pcall(function()
    require("mason-conform.health").check()
end)
check(health_ok, "health check runs without error" .. (health_ok and "" or (": " .. tostring(err))))

-- formatters module
local formatters = require("mason-conform.formatters").configured()
check(
    vim.deep_equal(formatters, { "autopep8", "cbfmt", "gofumpt", "prettier", "prettierd", "stylua" }),
    "formatters.configured() returns sorted unique names"
)

vim.notify = original_notify

print(("-"):rep(60))
if #failures > 0 then
    print(("%d FAILURE(S)"):format(#failures))
    os.exit(1)
end
print("all tests passed")