refactor: remove cache side effects from adapter.list

lua/oil/adapters/test.lua

@@ -1,4 +1,5 @@
 local cache = require("oil.cache")
+local util = require("oil.util")
 local M = {}
 
 ---@param url string
@@ -7,11 +8,49 @@ M.normalize_url = function(url, callback)
   callback(url)
 end
 
+local dir_listing = {}
+
 ---@param url string
 ---@param column_defs string[]
----@param cb fun(err?: string, fetch_more?: fun())
+---@param cb fun(err?: string, entries?: oil.InternalEntry[], fetch_more?: fun())
 M.list = function(url, column_defs, cb)
-  cb()
+  local _, path = util.parse_url(url)
+  local entries = dir_listing[path] or {}
+  local cache_entries = {}
+  for _, entry in ipairs(entries) do
+    local cache_entry = cache.create_entry(url, entry.name, entry.entry_type)
+    table.insert(cache_entries, cache_entry)
+  end
+  cb(nil, cache_entries)
+end
+
+M.test_clear = function()
+  dir_listing = {}
+end
+
+---@param path string
+---@param entry_type oil.EntryType
+---@return oil.InternalEntry
+M.test_set = function(path, entry_type)
+  if path == "/" then
+    return {}
+  end
+  local parent = vim.fn.fnamemodify(path, ":h")
+  if parent ~= path then
+    M.test_set(parent, "directory")
+  end
+  parent = util.addslash(parent)
+  if not dir_listing[parent] then
+    dir_listing[parent] = {}
+  end
+  local name = vim.fn.fnamemodify(path, ":t")
+  local entry = {
+    name = name,
+    entry_type = entry_type,
+  }
+  table.insert(dir_listing[parent], entry)
+  local parent_url = "oil-test://" .. parent
+  return cache.create_and_store_entry(parent_url, entry.name, entry.entry_type)
 end
 
 ---@param name string
@@ -20,22 +59,6 @@ M.get_column = function(name)
   return nil
 end
 
----@param path string
----@param entry_type oil.EntryType
-M.test_set = function(path, entry_type)
-  local parent = vim.fn.fnamemodify(path, ":h")
-  if parent ~= path then
-    M.test_set(parent, "directory")
-  end
-  local url = "oil-test://" .. path
-  if cache.get_entry_by_url(url) then
-    -- Already exists
-    return
-  end
-  local name = vim.fn.fnamemodify(path, ":t")
-  cache.create_and_store_entry("oil-test://" .. parent, name, entry_type)
-end
-
 ---@param bufnr integer
 ---@return boolean
 M.is_modifiable = function(bufnr)