From a52d8f7222997c55377e42f2988eb32f0bfdfdff Mon Sep 17 00:00:00 2001
From: Eric Dill <thedizzle@gmail.com>
Date: Sat, 11 Jul 2015 17:43:30 -0500
Subject: [PATCH] TST: Barn door testing on the divide-by-zero error

---
 .../graphicsItems/tests/test_ImageItem.py     | 65 +++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 pyqtgraph/graphicsItems/tests/test_ImageItem.py

diff --git a/pyqtgraph/graphicsItems/tests/test_ImageItem.py b/pyqtgraph/graphicsItems/tests/test_ImageItem.py
new file mode 100644
index 00000000..ce232296
--- /dev/null
+++ b/pyqtgraph/graphicsItems/tests/test_ImageItem.py
@@ -0,0 +1,65 @@
+import gc
+import weakref
+# try:
+#     import faulthandler
+#     faulthandler.enable()
+# except ImportError:
+#     pass
+
+from pyqtgraph.Qt import QtCore, QtGui, QtTest
+import numpy as np
+import pyqtgraph as pg
+app = pg.mkQApp()
+
+
+def test_dividebyzero():
+    import pyqtgraph as pg
+    im = pg.image(pg.np.random.normal(size=(100,100)))
+    im.imageItem.setAutoDownsample(True)
+    im.view.setRange(xRange=[-5+25, 5e+25],yRange=[-5e+25, 5e+25])
+    app.processEvents()
+    QtTest.QTest.qWait(1000)
+    # must manually call im.imageItem.render here or the exception
+    # will only exist on the Qt event loop
+    im.imageItem.render()
+
+
+if __name__ == "__main__":
+    test_dividebyzero()
+
+
+# def test_getViewWidget():
+#     view = pg.PlotWidget()
+#     vref = weakref.ref(view)
+#     item = pg.InfiniteLine()
+#     view.addItem(item)
+#     assert item.getViewWidget() is view
+#     del view
+#     gc.collect()
+#     assert vref() is None
+#     assert item.getViewWidget() is None
+#
+# def test_getViewWidget_deleted():
+#     view = pg.PlotWidget()
+#     item = pg.InfiniteLine()
+#     view.addItem(item)
+#     assert item.getViewWidget() is view
+#
+#     # Arrange to have Qt automatically delete the view widget
+#     obj = pg.QtGui.QWidget()
+#     view.setParent(obj)
+#     del obj
+#     gc.collect()
+#
+#     assert not pg.Qt.isQObjectAlive(view)
+#     assert item.getViewWidget() is None
+
+
+#if __name__ == '__main__':
+    #view = pg.PlotItem()
+    #vref = weakref.ref(view)
+    #item = pg.InfiniteLine()
+    #view.addItem(item)
+    #del view
+    #gc.collect()
+