rust/exercises/concept/rpn-calculator/tests/rpn-calculator.rs at 8f44f00bd83fe2ef3b46a218a97dd8e4cce3b843 · exercism/rust · GitHub

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use rpn_calculator::*;

fn calculator_input(s: &str) -> Vec<CalculatorInput> {
    s.split_whitespace()
        .map(|s| match s {
            "+" => CalculatorInput::Add,
            "-" => CalculatorInput::Subtract,
            "*" => CalculatorInput::Multiply,
            "/" => CalculatorInput::Divide,
            n => CalculatorInput::Value(n.parse().unwrap()),
        })
        .collect()
}

#[test]
fn empty_input_returns_none() {
    let input = calculator_input("");
    assert_eq!(evaluate(&input), None);
}

#[test]
#[ignore]
fn simple_value() {
    let input = calculator_input("10");
    assert_eq!(evaluate(&input), Some(10));
}

#[test]
#[ignore]
fn simple_addition() {
    let input = calculator_input("2 2 +");
    assert_eq!(evaluate(&input), Some(4));
}

#[test]
#[ignore]
fn simple_subtraction() {
    let input = calculator_input("7 11 -");
    assert_eq!(evaluate(&input), Some(-4));
}

#[test]
#[ignore]
fn simple_multiplication() {
    let input = calculator_input("6 9 *");
    assert_eq!(evaluate(&input), Some(54));
}

#[test]
#[ignore]
fn simple_division() {
    let input = calculator_input("57 19 /");
    assert_eq!(evaluate(&input), Some(3));
}

#[test]
#[ignore]
fn complex_operation() {
    let input = calculator_input("4 8 + 7 5 - /");
    assert_eq!(evaluate(&input), Some(6));
}

#[test]
#[ignore]
fn too_few_operands_returns_none() {
    let input = calculator_input("2 +");
    assert_eq!(evaluate(&input), None);
}

#[test]
#[ignore]
fn too_many_operands_returns_none() {
    let input = calculator_input("2 2");
    assert_eq!(evaluate(&input), None);
}

#[test]
#[ignore]
fn zero_operands_returns_none() {
    let input = calculator_input("+");
    assert_eq!(evaluate(&input), None);
}

#[test]
#[ignore]
fn intermediate_error_returns_none() {
    let input = calculator_input("+ 2 2 *");
    assert_eq!(evaluate(&input), None);
}