GraphicsView: Add basic tests ... (#1396)

pyqtgraph/widgets/tests/test_graphics_view.py

@@ -0,0 +1,90 @@
+from pyqtgraph.Qt import QtCore
+from pyqtgraph.Qt import QtGui
+import pyqtgraph as pg
+
+
+def test_basics_graphics_view():
+    app = pg.mkQApp()
+    view = pg.GraphicsView()
+    background_role = view.backgroundRole()
+    assert background_role == QtGui.QPalette.Background
+
+    palette = view.palette()
+    assert palette.isBrushSet(QtGui.QPalette.Active, QtGui.QPalette.Background)
+    assert palette.color(QtGui.QPalette.Background) == QtCore.Qt.transparent
+    assert view.backgroundBrush().color() == QtGui.QColor(0, 0, 0, 255)
+
+    assert view.focusPolicy() == QtCore.Qt.StrongFocus
+    assert view.transformationAnchor() == QtGui.QGraphicsView.NoAnchor
+    minimal_update = QtGui.QGraphicsView.MinimalViewportUpdate
+    assert view.viewportUpdateMode() == minimal_update
+    assert view.frameShape() == QtGui.QFrame.NoFrame
+    assert view.hasMouseTracking() is True
+
+    # Default properties
+    # --------------------------------------
+
+    assert view.mouseEnabled is False
+    assert view.aspectLocked is False
+    assert view.autoPixelRange is True
+    assert view.scaleCenter is False
+    assert view.clickAccepted is False
+    assert view.centralWidget is not None
+    assert view._background == "default"
+
+    # Set background color
+    # --------------------------------------
+    view.setBackground("w")
+    assert view._background == "w"
+    palette = view.palette()
+    assert palette.isBrushSet(QtGui.QPalette.Active, QtGui.QPalette.Background)
+    assert palette.color(QtGui.QPalette.Background) == QtCore.Qt.transparent
+    assert view.backgroundBrush().color() == QtCore.Qt.white
+
+    # Set anti aliasing
+    # --------------------------------------
+    aliasing = QtGui.QPainter.Antialiasing
+    # Default is set to `False`
+    assert not view.renderHints() & aliasing == aliasing
+    view.setAntialiasing(True)
+    assert view.renderHints() & aliasing == aliasing
+    view.setAntialiasing(False)
+    assert not view.renderHints() & aliasing == aliasing
+
+    # Enable mouse
+    # --------------------------------------
+    view.enableMouse(True)
+    assert view.mouseEnabled is True
+    assert view.autoPixelRange is False
+    view.enableMouse(False)
+    assert view.mouseEnabled is False
+    assert view.autoPixelRange is True
+
+    # Add and remove item
+    # --------------------------------------
+    central_item = QtGui.QGraphicsWidget()
+    view.setCentralItem(central_item)
+    assert view.centralWidget is central_item
+    # XXX: Removal of central item is not clear in code
+    scene = view.sceneObj
+    assert isinstance(scene, pg.GraphicsScene)
+    assert central_item in scene.items()
+
+    item = QtGui.QGraphicsWidget()
+    assert item not in scene.items()
+    view.addItem(item)
+    assert item in scene.items()
+    view.removeItem(item)
+    assert item not in scene.items()
+
+    # Close the graphics view
+    # --------------------------------------
+
+    view.close()
+    assert view.centralWidget is None
+    assert view.currentItem is None
+    assert view.sceneObj is None
+    assert view.closed is True
+
+    del view
+    app.deleteLater()