rhai/tests/decrement.rs

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use rhai::{Engine, EvalAltResult, INT};
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#[test]
fn test_decrement() -> Result<(), Box<EvalAltResult>> {
let engine = Engine::new();
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assert_eq!(engine.eval::<INT>("let x = 10; x -= 7; x")?, 3);
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assert!(matches!(
*engine.eval::<String>(r#"let s = "test"; s -= "ing"; s"#).expect_err("expects error"),
EvalAltResult::ErrorFunctionNotFound(err, _) if err == "- (string, string)"
));
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Ok(())
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}