[BUG] No tests found on neovim v0.12

[dfalcone19]

NeoVim Version
v0.12.0

Describe the bug
In neovim v0.11.xx neotest had no issues finding tests. Upgraded to neovim v0.12.0 this morning, and in the same file neotest is unable to find any tests.

To Reproduce
Note: using vim.pack, unsure if this may contribute to the issue.

vim.opt.runtimepath:remove(vim.fn.expand("~/.config/nvim"))
vim.opt.packpath:remove(vim.fn.expand("~/.local/share/nvim/site"))

  vim.pack.add({
    "https://github.com/nvim-lua/plenary.nvim",
    "https://github.com/nvim-neotest/nvim-nio",
    "https://github.com/antoinemadec/FixCursorHold.nvim",
    { src = "https://github.com/nvim-treesitter/nvim-treesitter", version = "main" },
    "https://github.com/nvim-neotest/neotest-python",
    "https://github.com/nvim-neotest/neotest",
  })

  require("neotest").setup({
    adapters = {
      require("neotest-python"),
    },
  })

Steps to reproduce the behavior:

1. Save the above as minimal.lua
2. Create a test file test_example.py with a simple test:

  def test_hello():
      assert True

3. Run nvim --clean -u minimal.lua test_example.py
4. Run :lua require("neotest").run.run(vim.fn.expand("%"))
5. No tests are found

Expected behavior
Tests to be found and run

Logs

ERROR | 2026-03-31T10:13:36Z-0400 | ...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:309 | Couldn't find positions in path /Users/name/company/backend/src/project/tests/common/test_format.py .../neovim/0.12.0/share/nvim/runtime/lua/vim/treesitter.lua:236: attempt to call method 'start' (a nil value)
stack traceback:
        .../neovim/0.12.0/share/nvim/runtime/lua/vim/treesitter.lua:236: in function 'get_node_text'
        ...ack/core/opt/neotest/lua/neotest/lib/treesitter/init.lua:29: in function 'build_position'
        ...ack/core/opt/neotest/lua/neotest/lib/treesitter/init.lua:66: in function 'collect'
        ...ack/core/opt/neotest/lua/neotest/lib/treesitter/init.lua:155: in function 'parse_positions_from_string'
        ...ack/core/opt/neotest/lua/neotest/lib/treesitter/init.lua:200: in function 'parse_positions'
        ...k/core/opt/neotest-python/lua/neotest-python/adapter.lua:68: in function 'discover_positions'
        ...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:300: in function <...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:264>
        [C]: in function 'xpcall'
        ...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:264: in function '_update_positions'
        ...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:317: in function <...m/site/pack/core/opt/neotest/lua/neotest/client/init.lua:315>

Additional context
Add any other context about the problem here.

[rcasia]

related to #590

[fredrikaverpil]

I believe this issue can be closed now.

[nunowallenstein]

i also have neovim 0.12.0, and i am facing the same issue after 5.15.0, no test recognition on windows, trying to run c# unit testing. I tried to initialize nvim-treesitter but this also didnt work, the logs are the same

Lua: [string "<nvim>"]:1: module 'nvim-treesitter' not found:
	no field package.preload['nvim-treesitter']
	no file '.\nvim-treesitter.lua'
	no file 'C:\Program Files\Neovim\bin\lua\nvim-treesitter.lua'
	no file 'C:\Program Files\Neovim\bin\lua\nvim-treesitter\init.lua'
	no file '.\nvim-treesitter.dll'
	no file 'C:\Program Files\Neovim\bin\nvim-treesitter.dll'
	no file 'C:\Program Files\Neovim\bin\loadall.dll'
stack traceback:
	[C]: in function 'require'
	[string "<nvim>"]:1: in main chunk
stack traceback:
	[C]: in function 'rpcrequest'
	...al/nvim-data/lazy/neotest/lua/neotest/lib/subprocess.lua:128: in function <...al/nvim-data/lazy/neotest/lua/neotest/lib/subprocess.lua:55>
	[C]: in function 'xpcall'
	...al/nvim-data/lazy/neotest/lua/neotest/lib/subprocess.lua:55: in function 'init'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:388: in function '_start'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:186: in function '_ensure_started'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:198: in function 'get_position'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:150: in function <...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:149>
	...cal/nvim-data/lazy/neotest/lua/neotest/consumers/run.lua:39: in function 'get_tree_from_args'
	...cal/nvim-data/lazy/neotest/lua/neotest/consumers/run.lua:80: in function 'func'
	.../AppData/Local/nvim-data/lazy/nvim-nio/lua/nio/tasks.lua:169: in function <.../AppData/Local/nvim-data/lazy/nvim-nio/lua/nio/tasks.lua:168>
ERROR | 2026-04-07T01:53:36Z+0100 | ...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:309 | Couldn't find positions in path C:\ProjectDirectory\CsharpTestFile.cs ...m Files/Neovim/share/nvim/runtime/lua/vim/treesitter.lua:236: attempt to call method 'start' (a nil value)
stack traceback:
	...m Files/Neovim/share/nvim/runtime/lua/vim/treesitter.lua:236: in function 'get_node_text'
	...eotest-dotnet/lua/neotest-dotnet/framework-discovery.lua:117: in function 'get_test_framework_utils_from_source'
	...vim-data/lazy/neotest-dotnet/lua/neotest-dotnet/init.lua:85: in function 'discover_positions'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:300: in function <...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:264>
	[C]: in function 'xpcall'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:264: in function '_update_positions'
	...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:317: in function <...Local/nvim-data/lazy/neotest/lua/neotest/client/init.lua:315>```

[nunowallenstein]

It seems like its trying to search for treesitter in windows here 'C:\Program Files\Neovim\bin\lua\nvim-treesitter.lua', but in windows at least in my machine i've installed everything by default using lazy, and the location of nvim-treesitter is here

%localappdata%\nvim-data\lazy\nvim-treesitter
does anyone know how to override this

[antoniorodr]

It seems the bug is happening again. MacOS here. Neovim 0.12.1

[ysomad]

Same issue, macos 15.7.3
NVIM v0.13.0-dev-2840+g2df2e72e0a-Homebrew
Build type: Release
LuaJIT 2.1.1774896198

[antoniorodr]

I did not change anything, but it is working again.

[BaneOfCode]

i also have neovim 0.12.0, and i am facing the same issue after 5.15.0, no test recognition on windows, trying to run c# unit testing. I tried to initialize nvim-treesitter but this also didnt work, the logs are the same

Lua: [string "<nvim>"]:1: module 'nvim-treesitter' not found:
	no field package.preload['nvim-treesitter']
	no file '.\nvim-treesitter.lua'
	no file 'C:\Program Files\Neovim\bin\lua\nvim-treesitter.lua'
	no file 'C:\Program Files\Neovim\bin\lua\nvim-treesitter\init.lua'
	no file '.\nvim-treesitter.dll'
	no file 'C:\Program Files\Neovim\bin\nvim-treesitter.dll'
	no file 'C:\Program Files\Neovim\bin\loadall.dll'

I am getting this same error on windows its using my neovim install directory instead of lazyvim path when using neotest-vstest

[adridevlyon]

I am getting the same error module 'nvim-treesitter' not found and opened a new PR with a code that fixed the issue on my side

@nunowallenstein @BaneOfCode maybe you could try this to validate that it works not only on my debian machine but also for Windows?