neo4j/neo4j — pull request #1177 by boggle (2013-09-12 17:11:26+00:00)
Title: Make merge use uniqueness constraints and take index entry locks

o Acceptance tests for Merge using constraints
o Introduce SchemaIndexKind to SchemaIndex start points
o Extend PlanContext to support lookup of unique indexes
o Add support for testing failing queries to DocTestBase
o Introduce ReferenceNodeAcceptanceTest
o Introduce DeleteReferenceNode helper for GraphDatabaseTestBase