@Test
public void writeNewReadExisting() throws IOException {
io.write("checkpoint.head", 1, 2, 3, 4, 5);
Checkpoint checkpoint = io.read("checkpoint.head");
assertThat(checkpoint.getPageNum(), is(equalTo(1)));
assertThat(checkpoint.getFirstUnackedPageNum(), is(equalTo(2)));
assertThat(checkpoint.getFirstUnackedSeqNum(), is(equalTo(3L)));
assertThat(checkpoint.getMinSeqNum(), is(equalTo(4L)));
assertThat(checkpoint.getElementCount(), is(equalTo(5)));
}
@Test
public void readInnexisting() throws IOException {
Checkpoint checkpoint = io.read("checkpoint.invalid");
assertThat(checkpoint, is(equalTo(null)));
}