add test for output with extra spaces that caused infinite loops

tests/fixtures/generic/xrandr_fix_spaces.out

@@ -0,0 +1,44 @@
+Screen 0: minimum 320 x 200, current 1846 x 768, maximum 8192 x 8192
+LVDS-1 connected primary 1366x768+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
+   1366x768      60.00*+
+   1280x720      60.00    59.99    59.86    59.74  
+   1024x768      60.04    60.00  
+   960x720       60.00  
+   928x696       60.05  
+   896x672       60.01  
+   1024x576      59.95    59.96    59.90    59.82  
+   960x600       59.93    60.00  
+   960x540       59.96    59.99    59.63    59.82  
+   800x600       60.00    60.32    56.25  
+   840x525       60.01    59.88  
+   864x486       59.92    59.57  
+   700x525       59.98  
+   800x450       59.95    59.82  
+   640x512       60.02  
+   700x450       59.96    59.88  
+   640x480       60.00    59.94  
+   720x405       59.51    58.99  
+   684x384       59.88    59.85  
+   640x400       59.88    59.98  
+   640x360       59.86    59.83    59.84    59.32  
+   512x384       60.00  
+   512x288       60.00    59.92  
+   480x270       59.63    59.82  
+   400x300       60.32    56.34  
+   432x243       59.92    59.57  
+   320x240       60.05  
+   360x202       59.51    59.13  
+   320x180       59.84    59.32  
+VGA-1 connected 480x640+1366+0 left (normal left inverted right x axis y axis) 408mm x 255mm
+   1440x900      59.89 +  74.98  
+   1280x1024     75.02    60.02  
+   1280x960      60.00  
+   1280x800      74.93    59.81  
+   1152x864      75.00  
+   1024x768      75.03    70.07    60.00  
+   832x624       74.55  
+   800x600       72.19    75.00    60.32    56.25  
+   640x480       75.00*   72.81    66.67    59.94  
+   720x400       70.08  
+HDMI-1 disconnected (normal left inverted right x axis y axis)
+DP-1 disconnected (normal left inverted right x axis y axis)

tests/test_xrandr.py

@@ -196,14 +196,21 @@ class XrandrTests(unittest.TestCase):
             txt = f.read()
         actual = parse(txt, quiet=True)
 
-        with open("tests/fixtures/generic/xrandr_simple.json", "w") as f:
-            json.dump(actual, f, indent=True)
-
         self.assertEqual(1, len(actual["screens"]))
         self.assertEqual(0, len(actual["unassociated_devices"]))
         self.assertEqual(
             2, len(actual["screens"][0]["associated_device"]["associated_modes"])
         )
 
+    def test_infinite_loop_fix(self):
+        with open("tests/fixtures/generic/xrandr_fix_spaces.out", "r") as f:
+            txt = f.read()
+        actual = parse(txt, quiet=True)
+
+        with open("tests/fixtures/generic/xrandr_fix_spaces.json", "r") as f:
+            json_dict = json.loads(f.read())
+
+        self.assertEqual(actual, json_dict)
+
 if __name__ == '__main__':
     unittest.main()