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tests: document RLP tests

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This commit is contained in:
Felix Lange 2015-07-17 15:42:23 +02:00
parent 5da82077d1
commit 593b1b65e7
1 changed files with 20 additions and 4 deletions
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22
tests/rlp_test_util.go
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@ -13,11 +13,22 @@ import (
"github.com/ethereum/go-ethereum/rlp"
)
// RLPTest is the JSON structure of a single RLP test.
type RLPTest struct {
// If the value of In is "INVALID" or "VALID", the test
// checks whether Out can be decoded into a value of
// type interface{}.
//
// For other JSON values, In is treated as a driver for
// calls to rlp.Stream. The test also verifies that encoding
// In produces the bytes in Out.
In interface{}
// Out is a hex-encoded RLP value.
Out string
}
// RunRLPTest runs the tests in the given file, skipping tests by name.
func RunRLPTest(file string, skip []string) error {
f, err := os.Open(file)
if err != nil {
@ -27,6 +38,7 @@ func RunRLPTest(file string, skip []string) error {
return RunRLPTestWithReader(f, skip)
}
// RunRLPTest runs the tests encoded in r, skipping tests by name.
func RunRLPTestWithReader(r io.Reader, skip []string) error {
var tests map[string]*RLPTest
if err := readJson(r, &tests); err != nil {
@ -49,6 +61,8 @@ func (t *RLPTest) Run() error {
if err != nil {
return fmt.Errorf("invalid hex in Out")
}
// Handle simple decoding tests with no actual In value.
if t.In == "VALID" || t.In == "INVALID" {
return checkDecodeInterface(outb, t.In == "VALID")
}
@ -62,7 +76,7 @@ func (t *RLPTest) Run() error {
if !bytes.Equal(b, outb) {
return fmt.Errorf("encode produced %x, want %x", b, outb)
}
// Test decoding from a stream.
// Test stream decoding.
s := rlp.NewStream(bytes.NewReader(outb), 0)
return checkDecodeFromJSON(s, in)
}
@ -103,8 +117,10 @@ func translateJSON(v interface{}) interface{} {
}
}
// checkDecodeFromJSON decodes from s guided by exp. For each JSON
// value, the value decoded from the RLP stream must match.
// checkDecodeFromJSON decodes from s guided by exp. exp drives the
// Stream by invoking decoding operations (Uint, Big, List, ...) based
// on the type of each value. The value decoded from the RLP stream
// must match the JSON value.
func checkDecodeFromJSON(s *rlp.Stream, exp interface{}) error {
switch exp := exp.(type) {
case uint64: