# -*- coding: utf-8 -*-

from sympy.core.relational import Eq
from sympy.core.symbol import Symbol
from sympy.functions.elementary.piecewise import Piecewise
from sympy.printing.preview import preview

from io import BytesIO


def test_preview():
    x = Symbol('x')
    obj = BytesIO()
    try:
        preview(x, output='png', viewer='BytesIO', outputbuffer=obj)
    except RuntimeError:
        pass  # latex not installed on CI server


def test_preview_unicode_symbol():
    # issue 9107
    a = Symbol('α')
    obj = BytesIO()
    try:
        preview(a, output='png', viewer='BytesIO', outputbuffer=obj)
    except RuntimeError:
        pass  # latex not installed on CI server


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