go test -run BinaryXML -dump
unzip junk.sdk.apk
mv AndroidManifest.xml a.xml
go test -run BinaryXML -dump
unzip junk.sdk.apk
mv AndroidManifest.xml b.xml
diff a.xml b.xml
# no output

// Binary resource structs support unmarshalling the binary output of aapt.
// Implementations of marshalling for each struct must produce the exact input
// sent to unmarshalling. This allows tests to validate each struct representation
// of the binary format as follows:
//
//  * unmarshal the output of aapt
//  * marshal the struct representation
//  * perform byte-to-byte comparison with aapt output per chunk header and body
//
// This process should strive to make structs idiomatic to make parsing xml text
// into structs trivial.
//
// Once the struct representation is validated, tests for parsing xml text
// into structs can become self-referential as the following holds true:
//
//  * the unmarshalled input of aapt output is the only valid target
//  * the unmarshalled input of xml text may be compared to the unmarshalled
//    input of aapt output to identify errors, e.g. text-trims, wrong flags, etc
//
// This provides validation, byte-for-byte, for producing binary xml resources.
//
// It should be made clear that unmarshalling binary resources is currently only
// in scope for proving that the BinaryMarshaler works correctly. Any other use
// is currently out of scope.