Add tests which check small values of max_document_size setting on the target

A low max_document_size setting on the target will interact with the replicator,
this commit adds a few tests to check that interaction.

There are 3 test scenarios:

 * A basic test checks that individual document sizes can be smaller than
  max_document_size yet, when batched together by the replicator they exceed,
  the maximum size. Replicator in that case should split document batches into
  halves down to individual documents, such that the replication should succeed.

 * one_large_one_small test checks that a large single document should be
  skipped such that it doesn't end on the target and it doesn't crash the
  replication job (so the small document should reach the target).

 * The third test is currently disable because of COUCHDB-3174. Once that
  issue is fixed, it will test a corner case in replicator when it
  switches from using batches and POST-ing to _bulk_docs to using individual
  PUT's with multipart/mixed Content-Type. Those PUT request can also return
  413 error code, so this tests it explicitly.

Jira: COUCHDB-3168
2 files changed
tree: 766a13364665374720c93db258d8f3cea51f5fbe
  1. priv/
  2. src/
  3. test/
  4. .gitignore
  5. .travis.yml
  6. LICENSE