def TestKnownValues(self):
""" Tests some linear equation by testing against known output """
var = ['Cost','PaintA','PaintB','PaintC','Quantity']
tokens = [(group,value) for group, value in self.lex.scan("2PaintA+3PaintB-0.5Cost")]
par = Parser(tokens, {}, var)
assert par.parseLinearEquation() == [(2, 1), (3, 2), (-0.5, 0)]
tokens = [(group,value) for group, value in self.lex.scan("5Cost*3.1+(-2)8*Quantity-(-8)PaintA")]
par = Parser(tokens, {}, var)
assert par.parseLinearEquation() == [(15.5, 0), (-16, 4), (8, 1)]
tokens = [(group,value) for group, value in self.lex.scan("2(1+0.5)PaintA+33*Quantity-13Cost*(2.5+1)")]
par = Parser(tokens, {}, var)
assert par.parseLinearEquation() == [(3.0, 1), (33, 4), (-45.5, 0)]
