ENH: Add test for vtkSphereSource

Change-Id: I58b32faaf195317c2c480203a9717080c9ac04dc
ENH: Add test for vtkArcSource

Change-Id: Ib2c348320457721634b06ac7af912211be4bb0a4
ENH: Add test for vtkConeSource

Change-Id: I713ccb955060f461b89313e2232b2c8205916f63
ENH: Add test for vtkCubeSource

Change-Id: I0a63fca833b0256009a0afa24724c958e1d5ac8d
ENH: Add test for vtkCylinderSource

Change-Id: I80b4cd2129fceb40d4784740f7174c3725af867e
ENH: Add test for vtkDiskSource

Change-Id: I4cec0ffd553b0987fd1d0a154fb78e6cfc0ea6d9
ENH: Add test for vtkPlaneSource

Change-Id: I8102153907d65837e2027259826f04f799d11714
ENH: Add test for vtkPointSource

Change-Id: I7c06a437739a2405d86e27edb891bc426155bef8
ENH: Add test for vtkRegularPolygonSource

Change-Id: Ia1080880bf81490c3131a71c97fd6ea2aabea740