code: def test_setRect():
      def assert_equal_transforms(tr1, tr2):
          dic = {  # there seems to be no easy way to get the matrix in one call:
              "tr11": (tr1.m11(), tr2.m11()),
              "tr12": (tr1.m12(), tr2.m12()),
              "tr13": (tr1.m13(), tr2.m13()),
              "tr21": (tr1.m21(), tr2.m21()),
              "tr22": (tr1.m22(), tr2.m22()),
              "tr23": (tr1.m23(), tr2.m23()),
              "tr31": (tr1.m31(), tr2.m31()),
              "tr32": (tr1.m32(), tr2.m32()),
              "tr33": (tr1.m33(), tr2.m33()),
          }
          log_string = "Matrix element mismatch\n"
          good = True
          for key, values in dic.items():
              val1, val2 = values
              if val1 != val2:
                  good = False
                  log_string += f"{key}: {val1} != {val2}\n"
          assert good, log_string
  
      tr = QtGui.QTransform()  # construct a reference transform
      tr.scale(2, 4)  # scale 2x2 image to 4x8
      tr.translate(-1, -1)  # after shifting by -1, -1
      # the transformed 2x2 image would cover (-2,-4) to (2,4).
      # Now have setRect construct the same transform:
      imgitem = pg.ImageItem(
          np.eye(2), rect=(-2, -4, 4, 8)
      )  # test tuple of floats
      assert_equal_transforms(tr, imgitem.transform())
  
      imgitem = pg.ImageItem(
          np.eye(2), rect=QtCore.QRectF(-2, -4, 4, 8)
      )  # test QRectF
      assert_equal_transforms(tr, imgitem.transform())
  
      imgitem = pg.ImageItem(np.eye(2))
      imgitem.setRect(-2, -4, 4, 8)  # test individual parameters
      assert_equal_transforms(tr, imgitem.transform())
  
      imgitem = pg.ImageItem(np.eye(2))
      imgitem.setRect(QtCore.QRect(-2, -4, 4, 8))  # test QRect argument
      assert_equal_transforms(tr, imgitem.transform())
  
file_path: pyqtgraph/tests/graphicsItems/test_ImageItem.py
imports: import time
  import numpy
  import pytest
  import pyqtgraph
  from pyqtgraph.Qt import QtCore, QtGui, QtTest
  from tests.image_testing import TransposedImageItem, assertImageApproved
label_desc: Use image node_id 5 for calling a global function with example usage: test_setRect() without return types