UglifyJS/test/compress/max_line_len.js

too_short: {
    beautify = {
        max_line_len: 10,
    }
    input: {
        function f(a) {
            return { c: 42, d: a(), e: "foo"};
        }
    }
    expect_exact: [
        'function f(a){',
        'return{',
        'c:42,',
        'd:a(),',
        'e:"foo"}}',
    ]
    expect_warnings: [
        "WARN: Output exceeds 10 characters"
    ]
}

just_enough: {
    beautify = {
        max_line_len: 14,
    }
    input: {
        function f(a) {
            return { c: 42, d: a(), e: "foo"};
        }
    }
    expect_exact: [
        'function f(a){',
        'return{c:42,',
        'd:a(),e:"foo"}',
        '}',
    ]
    expect_warnings: [
    ]
}