fix(spec): allow a spec module to be on the rtp and not only in config

tests/core/util_spec.lua

@@ -0,0 +1,40 @@
+local Util = require("lazy.util")
+local Cache = require("lazy.core.cache")
+local Helpers = require("tests.helpers")
+
+describe("util", function()
+  before_each(function()
+    Helpers.fs_rm("")
+  end)
+
+  it("lsmod lists all mods in dir", function()
+    local tests = {
+      {
+        files = { "lua/foo/one.lua", "lua/foo/two.lua", "lua/foo/init.lua" },
+        mods = { "foo", "foo.one", "foo.two" },
+      },
+      {
+        files = { "lua/foo/one.lua", "lua/foo/two.lua", "lua/foo.lua" },
+        mods = { "foo", "foo.one", "foo.two" },
+      },
+      {
+        files = { "lua/foo/one.lua", "lua/foo/two.lua" },
+        mods = { "foo.one", "foo.two" },
+      },
+    }
+
+    vim.opt.rtp:append(Helpers.path(""))
+    for _, test in ipairs(tests) do
+      Cache.cache = {}
+      table.sort(test.mods)
+      Helpers.fs_rm("")
+      Helpers.fs_create(test.files)
+      local mods = {}
+      Util.lsmod("foo", function(modname, modpath)
+        mods[#mods + 1] = modname
+      end)
+      table.sort(mods)
+      assert.same(test.mods, mods)
+    end
+  end)
+end)