Fix test_on_core_read_ready_os_error_suppressed test on multiple run

src/tribler/gui/tests/test_core_manager.py

@@ -119,19 +119,19 @@ def test_on_core_stderr_read_ready(mocked_print, core_manager):
     mocked_print.assert_called_with('core stderr', file=sys.stderr)
 
 
-@patch('builtins.print', MagicMock(side_effect=OSError()))
 def test_on_core_read_ready_os_error_suppressed(core_manager):
-    # OSError exceptions when writing to stdout and stderr are suppressed
-    core_manager.app_manager.quitting_app = False
-    core_manager.on_core_stdout_read_ready()
-    core_manager.on_core_stderr_read_ready()
-    assert print.call_count == 2
-
-    # if app is quitting, core_manager does not write to stdout/stderr at all, and so the call counter does not grow
-    core_manager.app_manager.quitting_app = True
-    core_manager.on_core_stdout_read_ready()
-    core_manager.on_core_stderr_read_ready()
-    assert print.call_count == 2
+    with patch('builtins.print', MagicMock(side_effect=OSError())) as mock_print:
+        # OSError exceptions when writing to stdout and stderr are suppressed
+        core_manager.app_manager.quitting_app = False
+        core_manager.on_core_stdout_read_ready()
+        core_manager.on_core_stderr_read_ready()
+        assert mock_print.call_count == 2
+
+        # if app is quitting, core_manager does not write to stdout/stderr at all, and so the call counter does not grow
+        core_manager.app_manager.quitting_app = True
+        core_manager.on_core_stdout_read_ready()
+        core_manager.on_core_stderr_read_ready()
+        assert mock_print.call_count == 2
 
 
 def test_decode_raw_core_output(core_manager):