Fix missing plenary.wrap in tests

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

Author: deathbeam

test/plugin_spec.lua

@@ -1,5 +1,11 @@
 -- Mock packages
-package.loaded['plenary.async'] = {}
+package.loaded['plenary.async'] = {
+  wrap = function(fn)
+    return function(...)
+      return fn(...)
+    end
+  end,
+}
 package.loaded['plenary.curl'] = {}
 package.loaded['plenary.log'] = {}