fail(String.format("Actual URL %s does not contain parameter %s", url,
expected));
}
void assertHasPart(Url url, String name, String filename, byte[] value, String contentType, String charset) {
Part expected = Part.newBuilder()
.setName(name)
.setFilename(filename)
.setValue(ByteString.copyFrom(value))
.setContentType(contentType)
.setCharset(charset)