#NEWLINE# def test_op_corners( self ) : #NEWLINE# #INDENT# empty = ( empty . empty + self . empty ) #NEWLINE# self . assertTrue ( empty . empty ) #NEWLINE# foo = ( self . frame + self . empty ) #NEWLINE# tm . assertIsInstance ( foo . index , DatetimeIndex ) #NEWLINE# tm . assert_frame_equal ( foo , ( self . frame * np . nan ) ) #NEWLINE# foo = ( self . empty + self . frame ) #NEWLINE# tm . assert_frame_equal ( foo , ( self . frame * np . nan ) )