update test to include resolution in cfg by default

Author: Remi-Gau

tests/test_setDefaultsPTB.m

@@ -64,10 +64,11 @@ function test_setDefaultsPtbAudio()
         'debug',  struct('do', true, 'transpWin',  true, 'smallWin',  true), ...
         'color',  struct( ...
         'background', [0 0 0]), ...
-        'text', struct('font', 'Courier New', 'size', 18, 'style', 1),  ...
-        'screen', struct( ...
-        'monitorWidth', 42, ...
-        'monitorDistance', 134));
+        'text', struct('font', 'Courier New', 'size', 18, 'style', 1));
+    
+    expectedCFG.screen.monitorWidth = 42;
+    expectedCFG.screen.monitorDistance = 134;
+    expectedCFG.screen.resolution = {[], [], []};
 
     % fixation cross or dot
     expectedCFG.fixation.type = 'cross';