Having a configuration where a single node is configured in "Settings.ServerTest.NodeIds.Static.AllProfiles.Scalar" set of nodes, e.g. Float
The test case "Subscription Services-> Subscription Basic -> 056.js" creates a subscription without closing it at the end of the test.
The problem is caused at line 14:
if( MonitoredItems[0] === null || MonitoredItems[1] === null ).
Because the test execution is not skipped, as intended.

MonitoredItems[1] is not === null since it's value is MonitoredItems[1] === undefined.
Instead of using the === operator the == operator should be used since it accepts also the undefined value.

The check should be this in order to skip the test in a configuration with a sigle node:

if( MonitoredItems[0] == null || MonitoredItems[1] == null ) {
addSkipped( "Static Scalar - 2 Nodes needed" );
return( false );
}