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test: replace busted with local harness

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Replace the busted-based Lua test runner with a repo-local harness.

The new harness runs spec files directly under `nvim -ll`, ships its own
reporter and lightweight `luassert` shim, and keeps the helper/preload
flow used by the functional and unit test suites.

Keep the file boundary model shallow and busted-like by restoring `_G`,
`package.loaded`, `package.preload`, `arg`, and the process environment
between files, without carrying extra reset APIs or custom assertion
machinery.

Update the build and test entrypoints to use the new runner, add
black-box coverage for the harness itself, and drop the bundled
busted/luacheck dependency path.

AI-assisted: Codex
This commit is contained in:
Lewis Russell
2026-03-25 13:33:17 +00:00
parent e289f9579c
commit 55f9c2136e
45 changed files with 3899 additions and 659 deletions
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7
test/functional/ui/screen.lua
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@@ -47,7 +47,6 @@
local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local busted = require('busted')
local uv = vim.uv
local deepcopy = vim.deepcopy
@@ -911,7 +910,7 @@ between asynchronous (feed(), nvim_input()) and synchronous API calls.
if eof then
err = err .. '\n\n' .. eof[2]
end
busted.fail(err .. '\n\nSnapshot:\n' .. self:_print_snapshot(), 3)
error(err .. '\n\nSnapshot:\n' .. self:_print_snapshot(), 3)
elseif did_warn then
if eof then
print(eof[2])
@@ -922,9 +921,9 @@ between asynchronous (feed(), nvim_input()) and synchronous API calls.
end
if flags.intermediate and not intermediate_seen then
busted.fail('Expected intermediate screen state before final screen state', 3)
error('Expected intermediate screen state before final screen state', 3)
elseif flags.unchanged and intermediate_seen then
busted.fail(
error(
'Expected screen state to be unchanged.\nIntermediate screen state:\n'
.. intermediate_state_snapshot,
3