def test_unary_with_combined_signs():
expr = '-+-+-+-+-78.92'
parser = ExpressionParser(expr)
assert parser.unary() == -78.92
def test_unary_with_multiple_plus_signs():
expr = '+++++++++++17.31230'
parser = ExpressionParser(expr)
assert parser.unary() == 17.3123
def test_unary_triple_negation():
expr = '---20'
parser = ExpressionParser(expr)
assert parser.unary() == -20
def test_unary_with_plus_sign():
expr = '+09.23'
parser = ExpressionParser(expr)
assert parser.unary() == 9.23
def test_unary_double_negation():
expr = '--19.60'
parser = ExpressionParser(expr)
assert parser.unary() == 19.60