test_preview.py 文件源码

def test_preview_latex_construct_in_expr():
    # see PR 9801
    x = Symbol('x')
    pw = Piecewise((1, Eq(x, 0)), (0, True))
    obj = BytesIO()
    try:
        preview(pw, output='png', viewer='BytesIO', outputbuffer=obj)
    except RuntimeError:
        pass  # latex not installed on CI server