Add pyqtgraph as submodule

pyqtgraph/graphicsItems/tests/test_GraphicsItem.py

@@ -0,0 +1,47 @@
+import gc
+import weakref
+try:
+    import faulthandler
+    faulthandler.enable()
+except ImportError:
+    pass
+
+import pyqtgraph as pg
+pg.mkQApp()
+
+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()
+    
+