Fix flaky EagerReaderTest.test_large_data_multibyte

static void expect_data_multibyte(eager_reader_t *reader, void *context) {

  char *data = (char *)context;

  int length = strlen(data);

  size_t length = strlen(data);

  for (int i = 0; i < length;) {

  for (size_t i = 0; i < length;) {

    uint8_t buffer[28];

    int bytes_to_read = (length - i) > 28 ? 28 : (length - i);

    int bytes_read = eager_reader_read(reader, buffer, bytes_to_read, false);

    EXPECT_EQ(bytes_to_read, bytes_read);

    for (int j = 0; j < bytes_read && i < length; j++, i++) {

    size_t bytes_to_read = (length - i) > 28 ? 28 : (length - i);

    size_t bytes_read = eager_reader_read(reader, buffer, bytes_to_read, false);

    EXPECT_LE(bytes_read, bytes_to_read);

    for (size_t j = 0; j < bytes_read && i < length; j++, i++) {

      EXPECT_EQ(data[i], buffer[j]);

    }

  }