def test_non_numeric_value(self):
with pytest.raises(TypeError):
te.eval('a+5', a='not a float')
def test_with_vars_missing_var(self):
with pytest.raises(ValueError, match='position 16'):
te.eval('(5 + x1) / 3 + f', x1=4)
def test_bad_characters_in_varnames(self, vname, exception):
expr = u'{}+4'.format(vname)
with pytest.raises(exception):
te.eval(expr, **{vname: 4.5})
def test_bad_characters(self, expr, exception):
with pytest.raises(exception):
te.eval(expr)
def test_various_inputs(self, expr, variables, result):
assert te.eval(expr, **variables) == approx(result)
def test_non_numbers(self):
assert te.eval('1/0') == float('inf')
assert math.isnan(te.eval('0/0'))
assert math.isnan(te.eval('sqrt(-1)'))
def test_parse_error(self):
with pytest.raises(ValueError, match='position 4'):
te.eval('(5+5')
def test_input_types(self):
assert te.eval(u'1+1') == 2
assert te.eval('1+1') == 2
assert te.eval(te.Expression('3+6')) == 9
def test_eval_missing_var(self, expression):
expr = te.Expression(expression, varnames='beta a')
with pytest.raises(TypeError, match='"beta"'):
te.eval(expr, a=4)
def test_eval_with_kwargs(self, expression):
expr = te.Expression(expression, varnames='beta a')
assert te.eval(expr, a=4, beta=9) == approx(.8888888)
assert te.eval(expr, a=9, beta=-1) == approx(-13.92839)