public void TestInsertBackground()
{
Microsoft.Office.Interop.PowerPoint.Shape bgShape = _designer.ApplyBackgroundEffect();
Assert.IsTrue(bgShape.Name.StartsWith(
EffectsDesigner.ShapeNamePrefix + "_" + EffectName.BackGround));
Assert.AreEqual(MsoShapeType.msoPicture, bgShape.Type);
Assert.AreEqual(0f, bgShape.Left);
Assert.AreEqual(0f, bgShape.Top);
Assert.AreEqual(540f, bgShape.Height);
Assert.AreEqual(960f, bgShape.Width);
}