johnyangk opened a new pull request #195: [NEMO-337] IRDAG Unit Tests
URL: https://github.com/apache/incubator-nemo/pull/195
 
 
   JIRA: [NEMO-337: IRDAG Unit 
Tests](https://issues.apache.org/jira/projects/NEMO/issues/NEMO-337)
   
   **Major changes:**
   - IRDAGTest: Tests to ensure various combinations of IRDAG insert(), 
delete(), and setEP() method invocations pass/fail the integrity checker as 
expected
   - IRDAGChecker: Aggregates all IRDAG EP/utility vertex integrity checking 
logic into a single place.
   
   **Minor changes to note:**
   - Removes IREdge property snapshot hacks
   - Removes unused legacy code (e.g., 
PhysicalPlanGenerator#splitScheduleGroupByPullStageEdges)
   
   **Tests for the changes:**
   - Simple tests in IRDAGTest
   - IRDAGTest#testThousandRandomConfigurations: Randomly generate and 
validates one thousand different (not necessarily unique) IRDAG configurations 
given a very simple three-vertex input IRDAG
   

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