fix(netrw): ensure netrw fallback works

lua/urlview/actions.lua

@@ -31,7 +31,7 @@ end
 function M.netrw(raw_url)
   local url = vim.fn.shellescape(raw_url)
   local ok, err = pcall(vim.cmd, string.format("call netrw#BrowseX(%s, netrw#CheckIfRemote(%s))", url, url))
-  if not ok and vim.startswith(err, "Vim(call):E117: Unknown function") then
+  if not ok and string.find(err, "Vim(call):E117: Unknown function", 1, true) then
     -- lazily use system action if netrw is disabled
     M.system(raw_url)
   end

tests/urlview/netrw_spec.lua

@@ -0,0 +1,26 @@
+local urlview = require("urlview")
+local actions = require("urlview.actions")
+local stub = require("luassert.stub")
+local netrw_action = require("urlview.actions").netrw
+
+describe("M.netrw fallback when netrw is disabled", function()
+  before_each(function()
+    -- disable netrw
+    vim.g.loaded_netrw = 1
+    vim.g.loaded_netrwPlugin = 1
+
+    vim.cmd("enew")
+    vim.api.nvim_buf_set_lines(0, 0, -1, false, {
+      "Here is a link: https://example.com",
+    })
+    urlview.setup({})
+  end)
+
+  it("calls the system fallback", function()
+    stub(actions, "system")
+
+    netrw_action("https://example.com")
+
+    assert.stub(actions.system).was.called_with("https://example.com")
+  end)
+end)