Handle seqno ack in MockDcpMessageProducers

ep_testsuite_dcp unconditionally enables sync replication in
add_stream_for_consumer, but returns ENGINE_ENOTSUP on receipt of a
seqno ack.

We should handle seqno acks like other ops, allowing tests to assert
that a seqno ack occurred.

Change-Id: I7de77d38334b0c1e5534ef9643594ef091dd3025
Reviewed-on: http://review.couchbase.org/111874
Reviewed-by: Dave Rigby <[email protected]>
Tested-by: Build Bot <[email protected]>

Author: jameseh96

engines/ep/tests/mock/mock_dcp.cc

@@ -408,6 +408,15 @@ ENGINE_ERROR_CODE MockDcpMessageProducers::prepare(
                                    nru);
 }
 
+ENGINE_ERROR_CODE MockDcpMessageProducers::seqno_acknowledged(
+        uint32_t opaque, Vbid vbucket, uint64_t prepared_seqno) {
+    last_op = cb::mcbp::ClientOpcode::DcpSeqnoAcknowledged;
+    last_opaque = opaque;
+    last_vbucket = vbucket;
+    last_prepared_seqno = prepared_seqno;
+    return ENGINE_SUCCESS;
+}
+
 ENGINE_ERROR_CODE MockDcpMessageProducers::get_error_map(uint32_t opaque,
                                                          uint16_t version) {
     clear_dcp_data();

engines/ep/tests/mock/mock_dcp.h

@@ -139,9 +139,7 @@ class MockDcpMessageProducers : public dcp_message_producers {
 
     ENGINE_ERROR_CODE seqno_acknowledged(uint32_t opaque,
                                          Vbid vbucket,
-                                         uint64_t prepared_seqno) override {
-        return ENGINE_ENOTSUP;
-    }
+                                         uint64_t prepared_seqno) override;
     ENGINE_ERROR_CODE commit(uint32_t opaque,
                              Vbid vbucket,
                              const DocKey& key,
@@ -190,6 +188,7 @@ class MockDcpMessageProducers : public dcp_message_producers {
     uint64_t last_collection_manifest_uid;
     cb::mcbp::DcpStreamId last_stream_id;
     std::string last_collection_filter;
+    uint64_t last_prepared_seqno;
 
 protected:
     /// Helper method for deletion / deletion_v2 / expiration