code: def test_ImageExporter_filename_dialog():
      """Tests ImageExporter code path that opens a file dialog. Regression test
      for pull request 1133."""
      p = pg.PlotWidget()
      p.show()
      exp = ImageExporter(p.getPlotItem())
      exp.export()
  
imports: import numpy
  import pyqtgraph
  import pyqtgraph.functions
  from pyqtgraph.exporters import ImageExporter
  from pyqtgraph.Qt import QtGui
label_desc: Use image node_id 1 for calling a global function with example usage: test_ImageExporter_filename_dialog() without return types