Added ignore dirs test

Author: miversen33

tests/dirs_spec.lua

@@ -25,4 +25,18 @@ describe("Directory utilities:", function()
     match = utils.dirs_match(cwd, allowed_dirs)
     assert.equals(true, match)
   end)
+
+  it("can handle only ignore directories", function()
+    local cwd = "~/Code/Neovim/persisted.nvim"
+    local allowed_dirs = {}
+    local ignored_dirs = { { "/tmp" } }
+    local allowed_match = utils.dirs_match(cwd, allowed_dirs)
+    local ignored_match = utils.dirs_match(cwd, ignored_dirs)
+    -- This looks weird, I know. That is because we expect dirs_match to return
+    -- false for allowed_dirs since allowed dirs is empty.
+    -- Therefore this is actually testing to ensure we are getting false and false
+    -- This test specifically addresses the change added in
+    -- https://github.com/olimorris/persisted.nvim/pull/152
+    assert.equals(true, not allowed_match and not ignored_match)
+  end)
 end)