[YARN-10321] Break down TestUserGroupMappingPlacementRule#testMapping into test scenarios

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 3.4.0
• Fix Version/s: 3.4.0
• Component/s: test
• Target Version/s: 3.4.0
• Hadoop Flags: Reviewed
• Assignee: Szilard Nemeth
• Reporter: Szilard Nemeth
• Created: 17/Jun/20 12:05
• Updated: 11/Feb/24 06:28
• Resolved: 22/Jun/20 07:20

Description

org.apache.hadoop.yarn.server.resourcemanager.placement.TestUserGroupMappingPlacementRule#testMapping is very large and hard to read/maintain and moreover, error-prone.
We should break this testcase down into several separate testcases.