assert.throws() should return thrown error

[nonplus]

It would be convenient if the return value of assert.throws() were the thrown error. This would allow you to do additional assertion on the return error; e.g. verifying that its code property has a specific value:

var err = assert.throws(function() { myFunction("bogus param"); },
    /Invalid parameters/);
assert.equal(err.code, "ExpectedCode", "err.code");

Alternatively, you could add support for passing a validation function as the matcher:

assert.throws(function() { myFunction("bogus param"); },
    function(err) {
        assert.match(err.message, /Invalid parameters/, "err.message");
        assert.equal(err.code, "ExpectedCode", "err.code");
});