UglifyJS/test/compress/debugger.js

keep_debugger: {
    options = {
        drop_debugger: false
    };
    input: {
        debugger;
    }
    expect: {
        debugger;
    }
}

drop_debugger: {
    options = {
        drop_debugger: true
    };
    input: {
        debugger;
        if (foo) debugger;
    }
    expect: {
        if (foo);
    }
}