func (s *HashSuite) TestHashingWriter(c *gc.C) {
data := "some data"
newHash, _ := hash.SHA384()
expected, err := hash.GenerateFingerprint(strings.NewReader(data), newHash)
c.Assert(err, jc.ErrorIsNil)
var writer bytes.Buffer
h := newHash()
hashingWriter := io.MultiWriter(&writer, h)
_, err = hashingWriter.Write([]byte(data))
c.Assert(err, jc.ErrorIsNil)
fp := hash.NewValidFingerprint(h)
c.Check(fp, jc.DeepEquals, expected)
c.Check(writer.String(), gc.Equals, data)
}
func (s *HashSuite) TestHashingReader(c *gc.C) {
expected := "some data"
stub := &testing.Stub{}
reader := &filetesting.StubReader{
Stub: stub,
ReturnRead: &fakeStream{
data: expected,
},
}
newHash, validate := hash.SHA384()
h := newHash()
hashingReader := io.TeeReader(reader, h)
data, err := ioutil.ReadAll(hashingReader)
c.Assert(err, jc.ErrorIsNil)
fp := hash.NewValidFingerprint(h)
hexSum := fp.Hex()
fpAgain, err := hash.ParseHexFingerprint(hexSum, validate)
c.Assert(err, jc.ErrorIsNil)
stub.CheckCallNames(c, "Read") // The EOF was mixed with the data.
c.Check(string(data), gc.Equals, expected)
c.Check(fpAgain, jc.DeepEquals, fp)
}