def test_mul_add_expr():
exp_calc = calculator.ExpressionCalculator('x*y+z', {
'x': 4,
'y': 23,
'z': 42
})
assert exp_calc.calc() == 134.0
def test_add_mul_expr():
exp_calc = calculator.ExpressionCalculator('x+y*z', {
'x': 42,
'y': 23,
'z': 4
})
assert exp_calc.calc() == 134.0
def test_invalid_expr():
assert calculator.ExpressionCalculator('x.y', {'x': 42, 'y': 23}) is False
def test_neg_num_expr():
exp_calc = calculator.ExpressionCalculator('-42')
assert exp_calc.calc() == -42.0
def test_div_expr():
expr_calc = calculator.ExpressionCalculator('x/y', {'x': 42, 'y': 4})
assert expr_calc.calc() == 10.5
def test_sub_expr():
exp_calc = calculator.ExpressionCalculator('x-y', {'x': 42, 'y': 23})
assert exp_calc.calc() == 19.0
def test_mul_expr():
exp_calc = calculator.ExpressionCalculator('x*y', {'x': 42, 'y': 4})
assert exp_calc.calc() == 168.0
def test_expr_with_spaces():
exp_calc = calculator.ExpressionCalculator(' 42 ')
assert exp_calc.calc() == 42.0
def test_add_expr():
exp_calc = calculator.ExpressionCalculator('x+y', {'x': 42, 'y': 23})
assert exp_calc.calc() == 65.0
def test_more_var_expr():
exp_calc = calculator.ExpressionCalculator('42', {'x': 23})
assert exp_calc.calc() == 42.0
def test_missing_var_expr():
assert calculator.ExpressionCalculator('x') is False
def test_neg_var_expr():
exp_calc = calculator.ExpressionCalculator('-x', {'x': 42})
assert exp_calc.calc() == -42.0
def test_float_num_expr():
exp_calc = calculator.ExpressionCalculator('42.23')
assert exp_calc.calc() == 42.23
def calc_expression(message):
data = json.loads(message)
exp_calc = calculator.ExpressionCalculator(data['expression'],
data['variables'])
return exp_calc.calc() if exp_calc else False