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# -*- 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
