Experimenting with Go's encoding/xml package.

output.txt

--- FAIL: aws.TestUnmarshalError (0.01 seconds)
	/Users/blake/src/aws.go/aws_test.go:55
	! "AuthFailure" != ""

problem.md

I'm trying to get a handle on how the XML package interprets and unmarshals XML and the structs tags.

I have a test that passes the first assert on RequestId, but fails on Code and Message; it's here: https://gist.github.com/1469359

I'm trying to only get the first error message in <Errors>.

I've tried to use a slice with no success either.

If anyone has experience with this package, I'd greatly appreciate some insight.

xml_test.go

func TestUnmarshalError(t *testing.T) {
    body := strings.NewReader(`
        <?xml version="1.0" encoding="UTF-8"?>
        <Response>
            <Errors>
                <Error>
                    <Code>AuthFailure</Code>
                    <Message>AWS was not able to validate the provided access credentials</Message>
                </Error>
            </Errors>
            <RequestID>afc00dc9-0c19-46db-a987-f7de2a12a361</RequestID>
        </Response>
    `)

    type Error struct {
        Code string
        Message string
    }

    type Response struct {
        RequestId string
        Errors []Error
    }

    got := new(Response)
    err := xml.Unmarshal(body, got)
    if err != nil {
        t.Fatal(err)
    }

    exp := &Response{
        RequestId: "afc00dc9-0c19-46db-a987-f7de2a12a361",
        Errors: []Error{
            {Code: "AuthFailure", Message: "AWS was not able to validate the provided access credentials"},
        },
    }

    assert.Equal(t, exp, got)
}