PYTHON-2779 Fix topologies field in snapshot reads test (mongodb#657)

Author: ShaneHarvey

test/__init__.py

@@ -673,6 +673,10 @@ def check_auth_with_sharding(self, func):
  func=func)
 
  def is_topology_type(self, topologies):
+ unknown = set(topologies) - {'single', 'replicaset', 'sharded',
+ 'sharded-replicaset', 'load-balanced'}
+ if unknown:
+ raise AssertionError('Unknown topologies: %r' % (unknown,))
  if self.load_balancer:
  if 'load-balanced' in topologies:
  return True

test/sessions/unified/snapshot-sessions-not-supported-server-error.json

@@ -4,9 +4,12 @@
  "runOnRequirements": [
  {
  "minServerVersion": "3.6",
- "maxServerVersion": "4.4.99",
+ "maxServerVersion": "4.4.99"
+ },
+ {
+ "minServerVersion": "3.6",
  "topologies": [
- "replicaset, sharded-replicaset"
+ "single"
  ]
  }
  ],
@@ -17,6 +20,11 @@
  "observeEvents": [
  "commandStartedEvent",
  "commandFailedEvent"
+ ],
+ "ignoreCommandMonitoringEvents": [
+ "findAndModify",
+ "insert",
+ "update"
  ]
  }
  },
@@ -87,9 +95,7 @@
  "$$exists": false
  }
  }
- },
- "commandName": "find",
- "databaseName": "database0"
+ }
  }
  },
  {