Boa 0.9.0

Boa is a Javascript lexer, parser and Just-in-Time compiler written in Rust. Currently, it has support for some of the language.
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use crate::exec;

#[test]
fn assignmentoperator_lhs_not_defined() {
    let scenario = r#"
        try {
          a += 5
        } catch (err) {
          err.message
        }
        "#;

    assert_eq!(&exec(scenario), "a is not defined");
}

#[test]
fn assignmentoperator_rhs_throws_error() {
    let scenario = r#"
        try {
          let a;
          a += b
        } catch (err) {
          err.message
        }
        "#;

    assert_eq!(&exec(scenario), "b is not defined");
}