feat(adapters): provide filter_dir function

See #13

lua/neotest/adapters/interface.lua

@@ -9,6 +9,13 @@ local NeotestAdapter = {}
 ---@return string | nil @Absolute root dir of test suite
 function NeotestAdapter.root(dir) end
 
+---Filter directories when searching for test files
+---@async
+---@param name string Name of directory
+---@param rel_path string Path to directory, relative to root
+---@param root string Root directory of project
+function NeotestAdapter.filter_dir(name, rel_path, root) end
+
 ---@async
 ---@param file_path string
 ---@return boolean

lua/neotest/client/init.lua

@@ -244,7 +244,16 @@ function NeotestClient:_update_positions(path, args)
       local root_path = existing_root and existing_root:data().path or path
       local files = lib.func_util.filter_list(
         adapter.is_test_file,
-        lib.files.find(path, { filter_dir = config.projects[root_path].discovery.filter_dir })
+
+        lib.files.find(path, {
+          filter_dir = function(...)
+            return (not adapter.filter_dir or adapter.filter_dir(...))
+              and (
+                not config.projects[root_path].discovery.filter_dir
+                or config.projects[root_path].discovery.filter_dir(...)
+              )
+          end,
+        })
       )
       local positions = lib.files.parse_dir_from_files(path, files)
       logger.debug("Found", positions)

lua/neotest/lib/file/find.lua

@@ -3,7 +3,6 @@ local M = {}
 
 local ignored = vim.tbl_add_reverse_lookup({
   "node_modules",
-  "venv",
 })
 
 --- Find all files under the given directory.