When adding setParameters for sharding tests like this:

options = {
    ...,
    other: {
      mongosOptions: {
        setParameter: {
          param1: val,
          param2 ...
        }
      },
    }
  }
st = new ShardingTest(options);

The test runner adds an extra setParameter - migrationLockAcquisitionMaxWaitMS for the mongos which causes it to fail to start. Instead, a user has to add set parameters like this - setParameter: "param1=val", which does not allow a user to specify multiple setParameters in an intuitive way (or possibly at all). See this example for how the ShardingTest set parameter needs to be specified.