Mock does not fail with invalid cas on append and prepend

[daschl]

Hi,

java-client has a test that looks like this:

    @Test(expected = CASMismatchException.class)
    public void shouldFailWithInvalidCASOnAppend() {
        assumeFalse(CouchbaseTestContext.isMockEnabled());

        StringDocument stored = bucket().upsert(StringDocument.create("appendCasMismatch", "foo"));
        bucket().append(StringDocument.from(stored, stored.cas() + 1));
    }

    @Test(expected = CASMismatchException.class)
    public void shouldFailWithInvalidCASOnPrepend() {
        assumeFalse(CouchbaseTestContext.isMockEnabled());

        StringDocument stored = bucket().upsert(StringDocument.create("prependCasMismatch", "foo"));
        bucket().prepend(StringDocument.from(stored, stored.cas() + 1));
    }

So we make sure that if an append or prepend is called with the wrong cas after the upsert, the server fails with a cas mismatch - the mock should too!

[avsej]

@daschl it should be fixed in http://review.couchbase.org/102417