code: def test_03_fg_0_bg_0():
      """Test all foreground pixels same, all background same, wv = 0"""
      img = numpy.zeros((4, 4))
      img[:, 2:4] = 1
      binary_image = img > 0.5
      output = centrosome.threshold.weighted_variance(
          img, numpy.ones(img.shape, bool), binary_image
      )
      assert output == 0
  
imports: import io
  import os
  import centrosome.threshold
  import numpy
  import pytest
  import scipy.ndimage
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  from cellprofiler_core.constants.measurement import FF_COUNT, COLTYPE_INTEGER, FF_FINAL_THRESHOLD, COLTYPE_FLOAT, FF_ORIG_THRESHOLD, M_NUMBER_OBJECT_NUMBER, M_LOCATION_CENTER_X, M_LOCATION_CENTER_Y, M_LOCATION_CENTER_Z, FF_SUM_OF_ENTROPIES, FF_WEIGHTED_VARIANCE
  from cellprofiler_core.constants.module._identify import TS_GLOBAL, TS_ADAPTIVE, O_TWO_CLASS, O_FOREGROUND, O_THREE_CLASS, O_BACKGROUND, RB_MODE, RB_SD, RB_MEAN, RB_MEDIAN, RB_MAD, TS_MANUAL, TS_MEASUREMENT
  from cellprofiler_core.image import VanillaImage
  import cellprofiler.modules.identifyprimaryobjects
  import cellprofiler.modules.threshold
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.setting
  import cellprofiler_core.workspace
  import tests.frontend
  import tests.frontend.modules
label_desc: Use image node_id 47 for calling a global function with example usage: test_03_fg_0_bg_0() without return types