tests: Disable the default `rc.lua` rules for the sake of testing.

lib/ruled/notification.lua

@@ -213,6 +213,15 @@ function module.add_rule_source(name, cb, ...)
     return nrules:add_matching_function(name, cb, ...)
 end
 
+-- Allow to clear the rules for testing purpose only.
+-- Because multiple modules might set their rules, it is a bad idea to let
+-- them be purged under their feet.
+function module._clear()
+    for k in pairs(nrules._matching_rules["ruled.notifications"]) do
+        nrules._matching_rules["ruled.notifications"][k] = nil
+    end
+end
+
 -- Add signals.
 local conns = gobject._setup_class_signals(module)
 

tests/test-naughty-screen.lua

@@ -5,6 +5,7 @@ local steps = {}
 
 local naughty = require("naughty")
 local grect   = require("gears.geometry").rectangle
+local rnotif  = require("ruled.notification")
 
 -- Do not use whatever `rc.lua` has. This avoids having to update the test
 -- every time.
@@ -72,6 +73,7 @@ end
 
 -- Create notifications in each position.
 table.insert(steps, function()
+    rnotif._clear()
     add_many(s1)
 
     return true